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采用粉末冶金法在较高的温度下制备了SiC,Si_3N_4和Al_(18)B_4O_(33)晶须增强Al-8.5Fe-1.3V-1.7Si耐热铝合金复合材料,山于采用不含Mg的基体避免了Al_(18)B_4O_(33)晶须界面上出现界面反应和Si_3N_4,SiC晶须界面上出现的界面生成物,所以所有晶须界面都是清洁的.加入晶须可以明显提高材料的强度和模量,三种晶须的增强效果依次为SiC,Si_3N_4和Al_(18)B_4O_(33).这类复合材料的强度随温度的升高呈线性下降,其使用温度可比SiC_w/2024Al复合材料提高50-100℃

Various whiskers, SiC, Si_3N_4 and Al_(18)B_4O_(33),reinforced Al-8.SFe1 .3V-1 .7Si alloy composites have been prepared by the P / M technique at elevated temperature. The interfacial reaction at the Al_(18)B_4O_(33) interfaces and interfacial reaction product at the SiC or Si_3N_4 interfaces were avoided by employing the alloy matrix without Mg. The strength and modulus of the composites may be obviously improved by incorporating the whiskers in effective sequence:SiC, Si_3N_4 and Al_(18)B_4O_(33). The strength of thess compositeswill linearly drop with increasing temperature, yet their service temperature seems to be 50-100 ℃ higher than that of SiCw / 2024Al composite.

参考文献

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[9] SuganumaK,FujitaT,NiiharaK,SuzukiN.JMaterSciLett,1989
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