2015年6月28日星期日

Straightening on titanium rod

Industry thought alloy bars having a "shape memory", that material could have been straightened by straightening, and over time it according to the original curvature. In fact, people think that all have shape-memory alloy is a misunderstanding. In the alloy system memory, the only In-Ti, Ti-Ni, Ti-Ni-Pd, Ti-Nb alloys containing titanium these types, only first discovered memory alloy like nickel - titanium alloy (50% Ti + 50 % Ni), we will mistakenly believe that a titanium bar stock with shape memory characteristics. Why, then, would have been straightening alloy bars, over a period of time according to the original curvature it out?
This is because the core of the metal rod has its own original bent, without any change in the straightening process. From the surface, even if the entire roundwood has been straightened and resilient core but can not get straightened. Otherwise it would not be called elastic core of. This time, straightening belong to a certain amount of anti-bending and straightening bent elastic recovery after the remaining zero curvature sometimes obtained a balance of straightening is resilient core of elastic recovery potential and peripheral metal Instead of excessive bending of the potential direction of a balance of equal size. This relative balance when changes in environmental conditions such as temperature change, external change, after the time change may imbalances bent. Thus, rod straightening, especially raw bar straightening a bent state serious, should not cause distortion of adoption under section inflection amount of suitable size to make it resilient core to a minimum, which is conducive to straightening quality of persistence. So these problems are due to the influence of the resilient core of straightening quality caused. Had straightening experience knows Straightening easier than bar, which did not affect the main reason is the core of the metal pipe on the overall flatness of the straightening process, which is why there is no Titanium tube fittings called "memory Features "Reasons

2015年6月25日星期四

New Development BDS alloy titanium rod technology industry

Industrial technology is a titanium rod directly formed by a titanium rod to produce parts of the process, the production of near-net-shape parts of high-volume, low-cost approach, which basically does not require further processing or finishing, can be a good control the size, stability and excellent parts, uniformity and mechanical properties can be fully guaranteed. Industrial production of titanium bar-BDS and BDS alloy parts without segregation, homogeneous, stable performance. Automotive BDS is a very attractive market, the development of new low-cost raw material production methods, and advanced industrial titanium rod near net shape technology, it is expected to make BDS into the automotive industry. Currently, the main obstacle to BDS and BDS alloy widely used is its high cost, the use of industrial titanium rod technology can effectively reduce costs. In order to adapt to further reduce production costs BDS and BDS alloy requirements of BDS Titanium round bar forming new technology continues to emerge.
One. Titanium injection molding. According to reports, Nagoya Institute of Technology prepared by the method of injection molding of pure BDS member. Study, the average particle size of 23 microns BDS dehydrogenation hydride powder, at a temperature of 1198 ~ 1348K sintering. When the sintering temperature is higher than 1298K, tensile strength greater than 630MPa; adding a certain amount if the average particle size of 15 microns hydrogenation dehydrogenation powder mixed gas atomized powder, sintering at lower temperatures (1248 ~ 1298K), may to obtain a high sintered density of the sintered body, and the elongation can reach 15% to 20%. The school will also metal injection molding techniques for BDS-6Al-4V titanium rod industry injection molding, sintering at 1223K, get a relative density of more than 96%, the tensile strength of BDS-6Al-4V alloy 950MPa of. Metallurgical Company, Osaka, Japan with metal injection molding process for the preparation of γ-BDSAl member, its nominal composition BDS-47Al-2.6Cr. Industrial titanium rod through the self-diffusion of high temperature synthesis in the system, and then mixed with an organic binder, mixing, injection molding and sintering to obtain a relative density of sintered parts up to 97%, showing a high strength and ductility. Tsinghua use of hydrogenation-dehydrogenation process obtained the BDS BDS pure powder injection molding material preparation, vacuum sintering temperature is 1250 ℃, the sintered density of up to 98%, sintered at this temperature for 1.5 hours, the product of tensile strength and elongation rate of 349MPa and 6.4%, respectively.
II. Titanium warm compaction. The technology industry titanium rod temperature and pressure technology as the basis, and combines the advantages of metal injection molding by adding an appropriate amount of powder lubricant or binder content and enhance and improve the liquidity of the mixed titanium rod, filling properties and formability , which can be used to manufacture complex geometries (such as undercut, threaded holes, etc.) parts, has a very broad prospects for development. China, Central South University of temperature and pressure forming process has been studied in the preparation of industrial titanium alloy rod BDS. Pure BDS experiment HDH prepared powder as raw material, under 500MPa pressed compacts after vacuum sintering at 1280 ℃. The study found that the tensile strength of the titanium rods, a mold temperature of 155 ℃ reaches a maximum 1051MPa, which is mainly a function of temperature improves the BDS titanium rod of plastic, are pressing the process of deformation of the particles provide a coordinating role rearrangement, improving the pressing density. On this basis they are in the same pressing conditions, the use of zinc stearate as a die wall lubricant nominal composition of BDS-6.8Mo-4.5Al-1.5Fe-1.5Nb mixing titanium rods were die wall lubrication warm compaction research process, after pressing the green density can reach 86% to 90% of theoretical density, exceeds the cold isostatic pressing process performance.

2015年6月22日星期一

Precision titanium rod technical requirements

Now, with industrial, chemical development and integration progress, some features excellent metal element, is used to make the appropriate industrial parts, and high-precision titanium rod is one of them, and huge development potential.
What is a high-precision titanium rod it?
It is made of titanium metal element precision bar, with its low density, high mechanical strength, easy processing, so many people are now processing it.
Then we have what technical precision Titanium round rod requests?
1, titanium and titanium alloy bars of chemical composition shall conform to GB / T3620.1, the deviation is not too large;
2, thermal processing bar diameter or side length and tolerances shall comply with the provisions of Table I;
3, thermal processing by car (mill) light bar and cold-rolled, cold-drawn bar diameter tolerances shall comply with the provisions of Table II;
4, after the thermal processing by car (grinding) roundness light bars should not half its size tolerances;
5, the processing state bar does not cut lengths strict rules.

2015年6月19日星期五

Titanium rod manufacturing requirements which

Titanium rod manufacturing requirements which, the current domestic production of titanium rod business a few, there are many such enterprises, many enterprises in Shanghai, but in the production of technical requirements, compliance is not a lot really, today Shanghai Tianyu Titanium titanium rod gave you talk about the technical requirements of production which:
A titanium rod manufacturing process
Titanium rod manufacturing generally need to go through three processes: forging → hot rolling → car light (polished)
1. Forging (hot forging): metal recrystallization temperature or higher, the forging process.
2. The hot-rolled (hot rolling): at a temperature above the recrystallization temperature of the rolling process.
3. car light (burnishing): polished is the use of a special rotating stick with abrasive grinding wheel (or belt) to cut metal parts of the surface of the process. Polished surface of the part can be removed burrs, rust, scratches, welding tumor, weld, trachoma, oxide and other macroscopic defects, to improve the flatness and plating quality parts.
Second, the implementation of international standards on the titanium bar stock
GB / 2965-2007, GB / T13810, Q / BS5331-91
Third, the production technology requirements
1. Chemical composition of titanium square tubing and titanium alloy bars shall comply with GB / T 3620.1, regulations, demand side reinspection, the chemical composition of the tolerances shall comply with the provisions of GB / T 3620.2 of.
Diameter or side length and tolerance rod 2. The thermal processing should be consistent with the provisions of one table.
3. thermal processing by car (mill) light bar and cold-rolled, cold-drawn bar diameter tolerances shall comply with the provisions of Schedule II.
4. thermal processing by car (grinding) roundness light bars should not half its size tolerances.
5. The process state does not cut length bar is 300-6000mm, annealed state bar not length length 300-2000mm, length or double length should be within the range of no definite length. Length Length tolerance of + 20mm ; double length rods should be included in the amount of incision, each cut the amount of 5mm. Length or double length should be specified in the contract.

2015年6月16日星期二

Superiority TC4 titanium rod casting

TC4 titanium rods titanium ingot production to be used as raw billet deformation, it can be processed into various types of semi-finished and finished products. Another important use is as a producing titanium master alloy castings, alloy castings currently recognized in the application and development of aviation, shipbuilding and petrochemical sectors rapidly, because, compared to TC4 titanium rod forgings, castings formed directly, thereby shortening Fung part of the production cycle and simplify the process, improve the finished product rate, so the cost significantly.
TC4 titanium rod is cast need to vacuum arc skull furnace, which is to make titanium was water-cooled copper crucible itself in the wall of a layer of condensate shell that separates the liquid titanium and copper crucible, the crucible to prevent material alloy pollution. TC4 titanium rod casting mold should be chosen with special materials, such as commonly used refractory magnesia (MgO), corundum (Al2O3), zirconium sand (Zr2O3), quartz sand (Si02), etc., at 1800 ℃ TC Titanium can and dramatic effect. Currently TC4 titanium rod casting mold is mainly used graphite type, including the machining of graphite, investment casting graphite; tamping graphite, pyrolytic graphite type. There are also application type calcium oxide, metal and ceramic refractory entirely like.
The most commonly used cast titanium alloy mostly using the same ingredients and deformation, such as TA7 and TC4, with its crystal spacing is small (40 to 80 ℃), small (0.5-1.5%), linear shrinkage, and high heat cracking performance, and therefore have a good process of cast iron. Health strict in order to overcome the disadvantage of feeding capacity was due to a small proportion of titanium, overheating caused by poor low, often using centrifugal casting.
Cast TC4 titanium rod Another - the advantage is very close to the deformation of the mechanical properties of Titanium Sheet Metal Price and heat resistance and fracture toughness than conventional production also TC4 titanium rod forgings, so the development of broad prospects.

2015年6月13日星期六

TC4 titanium rods used in oil refining industry

In most inorganic salts, TC4 titanium rods completely inert state, has excellent corrosion resistance. As in the production of electrolytic Mn02, MnSO4 neutral electrolyte solution, requiring electrodes sulfate corrosion resistance, leaving the use of lead alloys and graphite telegraph, the effect is not good. After the switch to titanium anode against corrosion, nearly flat to become a semi-permanent equipment.
TC4 titanium rods heart almost all acids and organic central medium has excellent corrosion resistance (formic acid, oxalic acid except). In addition to methanol, the titanium organic alcohols, aldehydes, ketones also corrosion resistant.
For example, the petrochemical industry, with acetaldehyde to acetic acid. Because of acetic acid, acetaldehyde, chloride and catalyst for serious corrosion of stainless steel equipment, and switch to precision titanium products, acetate production equipment to solve corrosion problems. In another example, propylene Acetone can also be used titanium production equipment, annual output of thirty thousand tons of acetone Japanese factory, with titanium nearly forty tons.
Finally, TC4 titanium rods for wet H2S gas, wet SO4 gas, ammonia and industrial atmospheric corrosion are (in the small and pure oxygen should be particularly careful with titanium hydrogen medium).
For example, the line oil refining industry, multi-device by H2S, NH8, sulfide, chloride corrosion, the use of Titanium Flange Screw the device resolves the problem of corrosion. Titanium in petroleum refining, the main distillation column, a condenser, air coolers and other equipment. In the production of ammonia and urea, titanium is the ideal corrosion-resistant material. In addition, coke production will encounter industrial atmospheric corrosion problems, there are many examples in this regard with desire.

2015年6月11日星期四

Feeding method of reducing titanium rod

Start feeding method while reducing titanium alloy bar talk. When the temperature in the reactor to a suitable temperature, the reaction was the addition of titanium tetrachloride and sodium while the established ratio. In general, in order to achieve further object of preparing titanium rod, it is based on the instantaneous molar feed ratio of Na: TiCl4 = 4 continuous feeding of the reaction of titanium and NaCl. When the ratio is low or inappropriate temperatures, as well as titanium dichloride and titanium trichloride is stable, as the reaction proceeds, gradually accumulated by TiCl4-Na-Ti-NaCl-TiCl2-TiCl2 composition of the melt The complex system.
Generally the lower the initial reaction temperature, after adding material when the material contacting the liquid mixture (TiCl4) - liquid (Na) phase reaction; TiCl4 endothermic gasification rear part, while there is a gas (TiCl4) - liquid (Na ) phase reaction. Ti and which product is titanium chloride, a mixture of titanium trichloride, the temperature rises titanium dichloride and titanium trichloride and continues to be the reduction of the residual sodium.
In the normal course of the reaction, generally maintain the melt temperature> 800 ℃, the ingredients are in addition to the TC Titanium rod outer liquid phase. They can share their natural stratification. The largest proportion of the resulting deposited Titanium tube fittings downward titanium rods gathered into a lump. A small proportion of liquid sodium, iron wall, titanium rods and NaCl poor wetting unit, it is easy to automatically go up the melt surface was exposed to a larger proportion of NaCl, deposited down, gradually accumulated to occupy the lower part of the reactor in addition to titanium rod other than volume.
In addition at the same time, by adding jitter can impact, titanium tetrachloride and sodium fall within the people melt, liquid sodium and soon float to the surface of the melt, and TiCl4 at low sodium weight ratio was only gradually after the heat float and escape the melt surface gasification. In this case the surface of the melt with gas (TiCl4) -. Liquid (Na> facies violent reaction due to the reaction temperature of the reaction zone centered over sodium boiling point (> 10000C), this time the reduction in boiling liquid sodium surface at high temperature gasification will always be some sodium, so the surface is also engaged Rong gas (TiCl4) -.. gas (Na) of the phase response Moreover, the liquid material in contact with each other inside the melt Shi conducted a liquid (TiCl4) - liquid (Na) of phase response.
Throughout Araliaceae process, since the reactants are successively added to the reactor, and in the surface of the melt. The resulting titanium rods deposited in the lower part of the reactor was shaped lump, under normal circumstances would not take the "bridge". Na, NaCl large difference in specific gravity, NaCl molten salt easily deposited in the lower part of the reactor. Therefore, ways and sodium reactants TiCl4 contact with each other is short, diffusion speed, to maintain a large reaction speed, until the latter part of the reaction. Since the melt temperature gradient in the larger memory and concentration gradients of the wave Shocks melt occurs and the melt flow of memory in the slow, have accelerated enlarge the process, help to improve the response rate.
Reactions produce mainly titanium, were generated TiCl2 or TiCl3, they are dissolved in liquid NaCl, different reaction rate, the resulting titanium rods are not the same. Direct reaction of titanium particles small, and rely on the melt titanium diffusion results in larger particles, and some crystalline titanium.

2015年6月9日星期二

Titanium rod filter Introduction and Notes

Titanium rod filter using a Powder coating titanium sintered filter, generally used for coarse filtration or intermediate filter. This filter has a high precision, high temperature, corrosion resistance, high mechanical strength, widely used in the pharmaceutical industry, housing material is 316L or 304 stainless steel, in line with GMP standards.
Filters with 316L stainless steel for housing, internal filter titanium tubing for sale, with light texture, high temperature, high pressure, acid, alkali, corrosion resistance, the filter can be regenerated repeatedly use features, is the use of titanium metal powder metallurgy method will not processing hollow filter tube made by high-temperature sintering method, which is widely used in food, beverage, pharmaceutical, chemical and other industries liquid-solid separation, especially for infusion and injection production line decarbonization filter in the pharmaceutical industry. This series has a compact and handsome in appearance according to GMP standards, tube connections using the international standard quick connector, removable for easy cleaning.

2015年6月6日星期六

Usefulness and characteristics of titanium rods

Titanium rods with high strength and density and small, mechanical function is good, patience and resist function very well. In addition, the difference in titanium technology function, machining difficult, in the thermal processing is very simple to absorb nitrogen hydrogen carbon and other impurities. There are poor abrasion resistance, production process messy. Titanium industrial production beginning in 1948. Aviation industry needs to carry out, the titanium industry with about 8% of the average annual growth rate of conduct. Current international titanium alloy material production reached 40,000 tons, nearly 30 kinds of titanium trademark. It is the most widely used titanium alloy Ti-6Al-4V (TC4), Ti-5Al-2.5Sn (TA7) and commercially pure titanium (TA1, TA2 and TA3). Titanium is mainly used for the production of aircraft engine compressor components, followed by rockets, missiles and high-speed aircraft layout elements. The mid-1960s, Titanium sheet metal and its alloys have been in the industry generally use electrodes for the production of electrolytic industry, power plant condensers, oil essence and desalination heater and environmental pollution control equipment. Titanium and its alloys have become an anticorrosive layout information. Also used in the production of hydrogen storage materials and shape memory alloys. Titanium is the aerospace industry in the use of an important new layout data, the proportion between the aluminum and steel strength and use temperature range, but high strength and excellent corrosion resistance to sea water features and ultra-low temperature capabilities. The amount of Powder coating titanium in the aviation engine is usually 20% to 30% by weight of the total distribution, mainly for the production of compressor parts, such as cast titanium fan, compressor disk and blades, cast titanium compressor casing, intermediate casing, the bearing housing and the like. The primary use of titanium spacecraft high specific strength, corrosion resistance and low temperature capabilities to produce a variety of pressure vessels, fuel tanks, fasteners, instrument straps, architecture and rocket casing. Sputnik, the lunar module, manned spacecraft and space shuttle are also using titanium plates welded.

2015年6月3日星期三

A brief description of the titanium rod

Titanium is a kind of extension, shiny objects, its main feature is the density, ease of processing. The process is simple titanium rod that is: forging - hot rolled - polished.
Usefulness of titanium rod
Mainly used for mechanical equipment, plating equipment, medical, mechanical and other kinds of fine career.
Conversion formula titanium rod
Diameter d, the density p, the length l
Mass m = π (d / 2) ^ 2 * l * p
See density 4.51g / cm3
Take your millimeters, it should be m = 0.0354d ^ 2 * l
For example 65 mm titanium rod mass m = 0.0354 * 65 ^ 2 * l = 149.58 * l
That is, every centimeter 149.58g