以镍铬合金为金属基底,在白榴石为主晶相的烤瓷粉中按不同比例加入Ni、Cr、NiO、Cr2O3作为梯度调节物,制备具有成分梯度结构的金属烤瓷.采用材料抗弯强度测试和热膨胀系数测试的方法筛选优化梯度调节物的配比,发现质量比为m(NiO):m(Cr2O3):m(Ni):m(Cr)=O:50:40:10时能得到抗弯强度为101.217MPa的最佳梯度层.用弹性应力模型模拟计算梯度层内的热应力曲线,研究了梯度层中富陶瓷端到富梯度调节物端热应力缓和的情况.抗弯强度、扫描电镜、XRD测试表明,减小烤瓷粉粒度可增强梯度层的性能,降低烧结温度.梯度层的抗弯强度呈现各向异性的特点.
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