为研究Ni基Y2W3O12复合材料的热学性能,首先,采用二次焙烧法制备了负膨胀材料Y2W3O12;然后,将Y2W3O12与金属Ni进行混合,并在1 200℃、50 MPa的条件下热压烧结制得40vol％Y2W3O12/Ni复合材料;最后,对复合材料的成分及热膨胀性能进行了研究.结果表明:在热压烧结过程中,由于Ni的还原性比W差,相对于对比试样40vol％ Y2W3O12/Cr复合材料中发生的复杂化学反应,40vol％Y2W3O12/Ni复合材料的两相之间并未发生反应,使40vol％ Y2W3O12/Ni复合材料保持了较低的热膨胀系数;经数次循环退火释放热应力及去除Y2W3O12相的结晶水后,40vol％ Y2W3O12/Ni复合材料在170～800℃温度范围内的热膨胀系数趋于稳定,约为3.4×10-6 K-1,与理论设计值4.0×10-6 K-1相近.
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