凝胶注模成形制备TiAl合金实验研究

Preparation of TiAl Alloy by Gel-Casting Process

摘要:

将凝胶注模成形技术应用于制备钛铝合金中，分别以氢化钛粉和铝粉、钛粉和铝粉为原料，经过低温烧结制成TiAl合金粉，经凝胶注模成形后通过脱胶和高温无压烧结制备了TiAl合金制件。结果表明：钛、铝粉在500 ℃保温2 h，再在600 ℃保温3 h得到TiAl合金粉，氢化钛、铝粉在750 ℃保温3 h得到TiAl合金粉；烧结工艺分别为1450 ℃保温2 h和1400 ℃保温2 h，可以得到致密度不同的制件，它们的致密度分别为91%和96.75%

Abstract:

TiAl alloy workpieces were prepared using titanium powder or titanium hydride power and aluminum powder as raw material by low-temperature sintering, gel-casting, batching out and pressureless sintering. The results show that the TiAl alloy powder can be obtained by heating titanium powder and aluminum power for 2 h at 500 oC and 3 h at 600 oC, or heating titanium hydride power and aluminum powder for 3 h at 750 oC. The last sintering process is 2 h at 1450 oC and 2 h at 1400 oC for the two kinds of processing. The relative density are 91% and 96.75%, respectively