气氛控制烧结制备17M/(10NiO-NiFe_2O_4)金属陶瓷的抗氧化性能研究

Study on the Anti-Oxidation Performance of 17M/(10NiO-NiFe_2O_4) Cermets Prepared by Controlled-Atmosphere Sintering Process

采用等温热重法,测试了冷压-烧结和气氛控制烧结两种方法制备的17M/(10NiO-NiFe2O4)(M=Cu和Ni)金属陶瓷惰性阳极的高温抗氧化性能。考察了氧化温度和氧化时间对17M/(10NiO-NiFe2O4)金属陶瓷氧化行为的影响,并对其氧化产物层微观结构进行了分析。结果表明,气氛控制烧结有利于提高金属陶瓷材料的抗氧化性,表面的致密氧化层能够有效阻挡氧的向内扩散。17Cu/(10NiO-NiFe2O4)金属陶瓷材料表面氧化层中的Cu的质量分数占到37.58%比过渡层中11.28%高,说明Cu有向表面迁移后再氧化的现象。

The high-temperature oxidation resistance of 17M/（10NiO-NiFe2O4）（M=Cu、Ni） cermets,which were prepared by cold-pressing sintering process and controlled-atmosphere sintering process,was tested with an isothermal heat-weight method at high temperature.The influence of oxidation temperature and oxidation time on 17M/（10NiO-NiFe2O4） cermets oxidation behavior was studied and the microstructure of its oxidation product layer was analyzed.The results shown that the process of controlled-atmosphere sintering was beneficial to improve oxidation resistance of cermets.And the dense oxide layer in the surface can effectively resist inward diffusion of oxygen.The mass fraction of Cu in the oxide layer of 17Cu/（10NiO-NiFe2O4） cermets is 37.58%,but 11.28% in transition layer.The phenomenon indicated that Cu was oxidized after migrated to the surface.