Preparation of Unitary Titanium Porous Restrictor
In this paper, unitary titanium porous restrictor metals were prepared by using a sintering welding technique. The results demonstrate that the restriction ability of unitary Ti porous restrictor is not only dependent on the morphology and particle size of the original powder, but also influenced by the molding pressure, sintering temperature and sintering pressure. The restrictor obtained from titanium powder with large particle size or spherical morphology possesses big porosity,large pore size and high permeability but low restriction. Instead,the restrictor derived from fine powder with irregular morphology has small porosity, narrow pore size but high restriction performance. In addition, the restriction ability of the titanium porous restrictor metals increases with the increase of molding and sintering pressure and the sintering temperature. However, a much higher sinter temperature will lead to a bad welding status which is attributed to excessive sintering shrinkage of the porous restrictor,and the cracks between the porous body and the compact shell easily occur. Furthermore, the strength of the dense Ti shell will decrease owing to the flaws caused by the grain growth during sintering. It is an ideal method to avoid the grain growth at high temperature through increasing the molding and sintering pressure and decreasing the sintering temperature, which can achieve a good sinter behavior and airtightness between the porous body and the Ti shell and thus satisfy the requirements in the applications.
Unitary Ti porous metal restrictor sinter diffusion welding
Tan Ping Pang GuangQing Tang HuiPing Chen Jinmei Ge Yuan Wang QiangBin Kang XinTing
State Key Laboratory of Porous Metal Materials,Northwest Institute for Nonferrous Metal Research, Xi Xian Baoder Powder Metallurgy CO. LTD,Xian 710016 ,China
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
1676-1680
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）