研究了颗粒补强Al2O3/SiC/(W,Ti)C复相陶瓷刀具材料 的氧化行为及其对材料抗弯强度的影响，结果表明：该材料在空气中静态氧化时的氧化增重 符合抛物线规律.随弥散相SiC和(W,Ti)C的增加，其氧化活化能有不同程度的降低.由于Si C的添加，使得氧化膜在高温下能以粘性流动的方式缓解残余应力，降低氧化速度，从而使 得材料的抗氧化性能有所提高.此外，适当的氧化处理可使Al2O3/SiC/(W,Ti)C陶瓷刀 具材料的抗弯强度得到提高.
Oxidation behavior of the particle reinforced Al2 O3/SiC/(W,Ti)C composite ceramic tool materials has been studied in detail,as well as the effect of the oxidation on the flexural strength of the material.It is shown that the weight gains in the static oxidation of the material under ai r atmosphere obey the parabolic law.The energy of activation of the material dec reases with the increase in the content of SiC and (W,Ti)C.Residual stresses in the oxidation film can be released with the form of the viscous flowing at high temperature.Therefore,the speed of the oxidation is lowered,and then the oxidat ion resistance of the material can be enhanced to some extent.It is found that t he appropriate oxidation is effective for the improvement of the flexural streng th of Al2O3/SiC/(W,Ti)C ceramic tool material.
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