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.