(中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 利用冷壓—燒結(jié)技術(shù)制備BaO摻雜的10NiO-NiFe2O4復(fù)合陶瓷， 研究BaO 摻雜量及燒結(jié)溫度對10NiO- NiFe2O4復(fù)合陶瓷物相組成、顯微結(jié)構(gòu)及致密度的影響。結(jié)果表明: 當(dāng)BaO 摻雜量(質(zhì)量分?jǐn)?shù))為0~4%時, 燒結(jié)樣品中主要含NiO 和NiFe2O4，BaO與10NiO-NiFe2O4陶瓷組分反應(yīng)并形成瞬時液相BaFe2O4和Ba2Fe2O5，且Ba2+ 固溶到基體中，促進(jìn)致密化燒結(jié)，降低了燒結(jié)致密化溫度；1
關(guān)鍵字: 10NiO-NiFe2O4復(fù)合陶瓷；BaO摻雜；惰性陽極；鋁電解；致密化
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The BaO doped 10NiO-NiFe2O4 composite ceramics were prepared with the cold isostatic pressing-sintering process, the effects of BaO contents and sintering temperatures 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 BaO is in the range of 0−4%, BaO reacts with the component of 10NiO-NiFe2O4 ceramics and forms low melting point phase BaFe2O4 and Ba2Fe2O5, and Ba2+ dissolves into the ceramic base, which is important to accelerate the sintering densification and reduce densification temperature. When sintered at 1 250 ℃, the samples doped with 1% BaO have the maximum relative density 98.90%, which increases 6.27% compared with that of the undoped samples. However, when the BaO content is 2% and 4%, the relative density of 10NiO-NiFe2O4 composite ceramics sample basically has no change.
Key words: 10NiO-NiFe2O4 composite ceramics; BaO doping; inert anode; aluminum electrolysis; densification
