(1. 中南大学 粉末冶金国家重点实验室，长沙 410083；2. 中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 研究以PVA为主要成分的粘结剂体系的热分解特性对大尺寸粉末压坯脱脂行为的影响，发现PVA的不均匀热分解是造成大尺寸粉末压坯脱脂失效的原因之一，开发一种具有稳定热分解反应特性的新型粘结剂体系，实现大尺寸粉末压坯的无缺陷热脱脂；研究烧结气氛、金属相的添加对NiFe2O4-10NiO致密化行为的影响。结果表明：N2气氛烧结及加入Ni可有效提高NiFe2O4-10NiO陶瓷基体的烧结致密度，1 350 ℃时于N2气氛中烧结的NiFe2O4-10NiO/5Ni型金属陶瓷材料的相对密度达到97.28％。采用优化工艺实现d 120 mm×140 mm深杯状NiFe2O4-10NiO/17Ni金属陶瓷惰性阳极脱脂预烧坯的烧结，所得烧结坯平均相对密度为95.21％。
关键字: NiFe2O4-10NiO/17Ni；金属陶瓷；惰性阳极；热脱脂
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The thermal burnout behavior of PVA was investigated; the failure of the large scale green body occurred in debinder process was mainly conducted by the unstable thermal decomposition of PVA. The new binder system with stable thermal decomposition character was gained and successfully applied in the thermal debinder process of the large scale inert anode samples. The influence of the sintering atmosphere and the addition of Ni on the densification of NiFe2O4-10NiO based ceramic were studied. The results show that N2 atmosphere and the addition of Ni can increase the sintered density of NiFe2O4-10NiO. The relative density of 97.28％ for NiFe2O4-10NiO/5Ni is obtained when the samples were sintered at 1 350 ℃ for 2 h in N2 atmosphere. The deep cup shape inert anode sample, with NiFe2O4-10NiO/17Ni and the green dimension of d 120 mm×140 mm, is gained by the optimized process, and its average relative density reaches 95.21％.
Key words: NiFe2O4-10NiO/xNi; cermet; inert anode; thermal debinder
