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How can we use powder metallurgy technology to produce Ti and Ti alloy parts

Categories: ZCMIM NewsStars: 3StarsVisit: -Release time: 2019-08-05 15:20:00
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Ti and Ti alloy parts produced by powder metallurgy have no composition segregation, uniform structure and stable performance. Ti Automotive is a very attractive market. The development of new low-cost raw material production methods, combined with advanced powder metallurgy near-net forming technology, is expected to bring Ti into automotive manufacturing industry.

At present, the main obstacle to wide application of Ti and Ti alloys is their high cost. The application of powder metallurgy technology can effectively reduce cost. In order to further reduce production cost of Ti and Ti alloy, Ti powder metallurgy technology is constantly emerging. 

The first method is titanium injection molding, which is used by Nagoya institute of technology in Japan to prepare pure Ti parts. Hydrogenated dehydrogenated Ti powder with an average particle size of 23 microns was sintered at a temperature of 1198 ~ 1348K. When the sintering temperature is higher than 1298K, the tensile strength is greater than 630MPa. If a certain amount of gas atomized powder with average particle size of 15 microns is added into hydrogenated dehydrogenation powder, high density sintered parts can be obtained at a lower sintering temperature (1248 ~ 1298K), and the elongation can reach 15% ~ 20%. Ti-6al-4v alloy powder was sintered at 1223K to obtain ti-6al-4v alloy with relative density greater than 96% and tensile strength up to 950MPa.

Japanese Osaka metallurgical corporation made outγ-TiAl components by metal injection molding with nominal component ti-47al-2.6 Cr. The alloy powder was prepared by self-diffusion high-temperature synthesis, and then mixed, stirred, injected and sintered with organic binder to obtain sintered parts with relative density up to 97%, showing high strength and ductility. Ti powder obtained by hydrogenation dehydrogenation method was used by tsinghua university in China to prepare pure Ti injection molding materials. When vacuum sintering temperature was 1250℃, the sintering density was up to 98%, and sintering at this temperature for 1.5 hours, the tensile strength and elongation reached 349MPa and 6.4% respectively. 

The second method is titanium warm compaction. The technology is based on warm compaction process and combines the advantages of metal injection molding. By adding appropriate amount of micro powder and increasing the content of lubricant or binder, the fluidity, filling performance and forming ability of mixed powder are improved, which can be used to make complex geometry (such as lateral concave, threaded hole, etc.) parts.

Keywords in the article: powder metallurgy technology
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