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以Al(NO3)3·9H2O、NH3·H2O、W、Cr等为原料,采用溶胶-凝胶自生粉末冶金法制备氧化铝颗粒增强钨铬双金属基复合材料,对烧结过程中增强颗粒Al2O3生成机制及对Al2O3/W-Cr复合材料的结合界面进行研究。结果表明:Al2O3体积分数为10%时洛氏硬度达到最高值,为58.7,致密度随Al2O3体积分数的增加呈下降趋势;复合材料的增强颗粒氧化铝是由溶胶-凝胶过程中生成的Al(OH)3烧结分解而得,该Al(OH)3经过1 200℃保温1 h烧结可得到增强效果最佳的α-Al2O3;该复合材料的结合方式并非简单的机械包裹,而是冶金结合。
Al 2 O 3 · 9H 2 O, NH 3 · H 2 O, W and Cr were used as raw materials to prepare the reinforced tungsten-bismuth-bismuth-based composites by sol-gel autogenous powder metallurgy method. Mechanism and the bonding interface of Al2O3 / W-Cr composites were studied. The results show that the Rockwell hardness reaches the highest value of 58.7 at the volume fraction of 10% Al2O3, and the density decreases with the increase of the volume fraction of Al2O3. The composite reinforced alumina is composed of Al (OH) 3, the α-Al2O3 with the best enhancement effect can be obtained by sintering the Al (OH) 3 at 1 200 ℃ for 1 h. The combination of the composite materials is not a simple mechanical package but a metallurgical bond .