Powder metallurgy method prepare titanium powder
by Lee Dora noneMetal titanium and titanium alloys prepared by powder metallurgy method have large chemical activity, easy to polluted by gas and crucible material, thus high quality titanium powder primarily in high vacuum or high purity inert gas protect, use centrifugal atomization process to produce. Products forming are generally not adding binder, the blank must be sintered in vacuum. Late 1940s, it was the first to carry out the pressing and sintering technology research about sponge titanium powder as raw material. However, the product performance produced by this process can not meet the requirements of the aviation sector, mainly for the corrosion, filter and other parts of manufacturing chemical industry, light industry, metallurgy, marine development and other departments needed. Of which the first product won industrial application is titanium porous filter material.
In mid-1960s, began to develop rotating electrode process taking titanium alloy powder and hot isostatic densification process. With this technology, the static mechanical properties of products are equivalent with melting processing products, but significantly reduced machining, improved material utilization, started using for the aviation industry. To the late 1970s, titanium powder metallurgy products in corrosion resistance and aviation applications receive rapid development. In the early 1970s, Chinese metal powder supplier began the research of titanium powder metallurgy process and products, titanium valves, bushings, perforated tubes and plates, titanium-titanium carbide wear-resistant materials and corrosion resistant alloys such as titanium-molybdenum have industrial production. In the late 1970s, launched a research about centrifugal atomization prepare high quality titanium powder and hot isostatic pressing technology.
Milling process to produce titanium and titanium
alloy powders have the following four methods: ① sodium reduce sponge titanium powder.
This powder large yield, cheap, powder plasticity is good, suitable for cold
forming, is the main raw material to produce general corrosion products. Because
of its high content sodium and chloride ions, it is easily to contaminated apparatus
and deteriorated the material welding performance while sintering. ② electrolytic titanium powder. High
purity, but the moldability of the electrolytic titanium powder is poor than sponge
titanium powder. ③ dehydrogenation hydrogenated titanium powder. Through hydrogenation
dehydrogenation process can obtain good quality, fine grain size titanium
powder and alloy powder; but the volume is small, the price is more expensive. ④ centrifugal atomization titanium
powder. In 1960
Densification process depending on the powder
materials’ requirements of the products, can use different densification
processes. Mainly have: ① bulk or low pressure forming powder sintered, sintered porosity is
25 to 70%. ② pressing and sintering. Pressing can be used mechanical or
isostatic pressing, pressing pressure at 2000 ~ 4000kgf/cm, the sintering
temperature is 1000
Source:http://www.mhcmp.com
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Created on Dec 31st 1969 18:00. Viewed 0 times.