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以高温固相合成法合成的NiFe2 O4陶瓷粉体和金属Cu粉为原料 ,采用冷压烧结法制备了Cu含量在5 %～ 2 0 %之间的NiFe2 O4 Cu金属陶瓷惰性阳极 ,研究了烧结气氛和烧结温度对其物相组成、微观形貌和基本物理性能的影响。结果表明 :通过控制烧结气氛中氧分压在NiO和Cu2 O的离解反应平衡氧分压之间 ,可以制备出具有目标物相组成的NiFe2 O4 Cu金属陶瓷 ;烧结温度和保温时间对所得NiFe2 O4 Cu金属陶瓷的相对密度有较大影响 ;NiFe2 O4和Cu之间的不润湿性限制了NiFe2 O4 Cu金属陶瓷烧结温度的提高和保温时间的延长 ,在保证金属相分布均匀且不溢出的前提下 ,所制备的NiFe2 O4 Cu金属陶瓷的相对密度较小 ;金属相Cu含量越高 ,NiFe2 O4 Cu金属陶瓷最高烧结温度越低、最长保温时间越短 ,从而相对密度越低、孔隙率越高 ;除了尽量降低金属相含量外 ,还可向NiFe2 O4 Cu金属陶瓷中添加其他金属如Ni和Co等 ,以改善陶瓷相与金属相之间的润湿性 ,以提高烧结温度 ,进而提高其相对密度和耐腐蚀性能。
NiFe2 O4 Cu cermet inert anode with Cu content of 5% ~ 20% was prepared by cold-pressure sintering with NiFe2 O4 ceramic powder synthesized by high-temperature solid-state synthesis and Cu powder as raw material. Sintering Atmosphere and sintering temperature on its phase composition, micro-morphology and the basic physical properties. The results show that NiFe 2 O 4 Cu cermet with target phase composition can be prepared by controlling the partial pressure of oxygen in the dissociation reaction between NiO and Cu 2 O in the sintering atmosphere. The sintering temperature and holding time of NiFe 2 O 4 The relative density of Cu cermet has a greater impact; the non-wettability between NiFe 2 O 4 and Cu limits the sintering temperature of NiFe 2 O 4 Cu and the prolongation of holding time. Under the premise of ensuring uniform metal phase distribution and not overflowing , The relative density of the prepared NiFe2 O4 Cu cermet is smaller; the higher the metal phase Cu content, the lower the maximum sintering temperature of the NiFe2 O4 Cu cermet is, the shorter the maximum holding time is, so the lower the relative density is, the higher the porosity is ; In addition to minimize the metal phase content, but also to NiFe2 O4 Cu cermet added to other metals such as Ni and Co, etc., in order to improve the wettability between the ceramic phase and the metal phase to improve the sintering temperature, thereby increasing its relative Density and corrosion resistance.