賀躍輝2， 黃伯云2，劉業(yè)翔1
(1. 中南大學 冶金科學與工程學院, 長沙 410083；
2. 中南大學 粉末冶金國家重點實驗室， 長沙 410083)
摘 要: 采用冷壓-燒結技術制備了CaO摻雜的10NiO-NiFe2O4復合陶瓷， 研究了CaO摻雜量及燒結溫度對10NiO-NiFe2O4復合陶瓷物相組成、 顯微結構及致密度的影響。 結果表明：當CaO摻雜量為0～4%（質量分數(shù)）時，燒結樣品中主要含有NiO和NiFe2O4兩種， CaO與10NiO-NiFe2O4陶瓷組分反應并形成低熔點相，且Ca2＋離子固溶到基體組分中， 促進致密化燒結， 降低了燒結溫度；當CaO摻雜量為4%時， 過剩的CaO存在于陶瓷顆粒間， 抑制了致密化過程的進行； 于1 200 ℃燒結時， 2%CaO摻雜樣品的相對密度最大， 達到98.75%，比未摻雜樣品的相對密度提高近24%； 當燒結溫度從1 200當升高到1 400 ℃時， CaO摻雜量為0、 0.5%和1.0%的樣品相對密度提高20%以上， 但當CaO摻雜量為2%和4%時， 陶瓷樣品相對密度反而下降， 且晶粒明顯長大。
附件:(2006)08-1355-06
關鍵字: 10NiO-NiFe2O4復合陶瓷； CaO摻雜； 惰性陽極； 鋁電解； 致密化
10NiO-NiFe2O4 composite ceramics
HE Yue-hui2, HUANG Bai-yun2, LIU Ye-xiang1
（1. School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract: The CaO doped 10NiO-NiFe2O4 composite ceramics were prepared with the cold isostatic pressing-sintering process, the effects of CaO content and sintering temperature on the phase composition, microstructure and density of 10NiO-NiFe2O4 composite ceramics were studied. The results show that the samples are mainly consisted of NiO and NiFe2O4 when content of CaO is 0-4%(mass fraction), CaO reacts with the component of 10NiO-NiFe2O4 ceramics and forms low melting point phase, and Ca2+ dissolves into the ceramic base, which is important to accelerate the sintering densification and reduce sintering temperature. When sintered at 1 200 ℃, the samples doped with 2% CaO have the maximum relative density(98.75%), which increases about 24% compared with the undoped samples. When the CaO content is 4%, the excessive CaO indwelling between the base ceramic grains restrains the densification of 10NiO-NiFe2O4 composite ceramics. When the sintering temperature rises from 1 200 to 1 400 ℃, the relative density of the samples doped with 0, 0.5% and 1% CaO increase 20%, but the relative densities of the samples doped with 2% and 4% CaO decrease and the grains coarsen obviously.
Key words: 10NiO-NiFe2O4 composite ceramics; CaO doping; inert anode; aluminum electrolysis; densification
