用反应合成法制备了Al质量分数为35%的多孔TiAl合金,用约束烧结优化孔结构后多孔体的最大孔径约2--3 um,用化学镀方法制备了Pd/多孔TiAl合金基复合透氢膜, 研究了复合透氢膜的性能.结果表明, 制备出的复合透氢膜为纯净钯膜, 表面膜层致密, 厚度约为7 um.在600℃以下, Pd/多孔TiAl合金复合膜具有良好的界面热稳定性.在500℃退火后复合膜具有优异的抗热震性能. 退火后复合膜的氢分离性能为:在温度为500℃、压差为0.02--0.18 MPa条件下,复合膜的氢气平均渗透系数F为5.1×10-6mol×m-2×s-1×Pa-1,H2/N2选择性为323--400.
Porous TiAl alloy substrate , whose maximum pore size is about 2μm, was fabricated with titanium and aluminum elemental powders by P/M technique with pressure sintering.The palladium composite membrane was fabricated by electroless plating. It was proved that the membrane obtained in the experiment was pure palladium by X-Ray diffraction result. Scanning electron microscopy(SEM) showed that the surface membrane was dense and its thickness was about 10μm. The advantages of porous TiAl alloy as substrate of palladium membrane were discussed through three aspects (lattice matching, Linear expansion coefficients proximity and controllability of pore structure ). The trace analysis results of chemical constitutions of electroless plating baths after the electroless plating showed that the influence of TiAl alloy substrate to the stability of electroless plating baths was slight. The interdiffusion in high temperature between TiAl alloy and palladium was analysed by a heat treatment at 600℃ for 96 hours. A gas permeation experiment was conducted under temperature of 400–500℃ and pressure of 0.02–0.18MPa. Hydrogen permeance and selectivity of hydrogen/nitrogen (H2/N2) were 6.8×10−7 molm−2 s−1 Pa−1 and greater than 628 at 500℃, respectively.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%