BaO掺杂对10NiO-NiFe₂O₄复合陶瓷烧结致密化的影响

来源期刊：中国有色金属学报2008年第5期

论文作者：何汉兵 黄伯云 李志友 周科朝

文章页码：851 - 851

关键词：10NiO-NiFe₂O₄复合陶瓷；BaO掺杂；惰性阳极；铝电解；致密化

Key words：10NiO-NiFe₂O₄ composite ceramics; BaO doping; inert anode; aluminum electrolysis; densification

摘    要：利用冷压—烧结技术制备BaO掺杂的10NiO-NiFe₂O₄复合陶瓷， 研究BaO 掺杂量及烧结温度对10NiO- NiFe₂O₄复合陶瓷物相组成、显微结构及致密度的影响。结果表明: 当BaO 掺杂量(质量分数)为0~4%时, 烧结样品中主要含NiO 和NiFe₂O₄，BaO与10NiO-NiFe₂O₄陶瓷组分反应并形成瞬时液相BaFe₂O₄和Ba₂Fe₂O₅，且Ba²⁺ 固溶到基体中，促进致密化烧结，降低了烧结致密化温度；1 250 ℃烧结时，1% BaO 掺杂样品的相对密度最 大，达到98.90% ，比未掺杂样品的相对密度提高6.27%；但当BaO掺杂量为2%和4%时，陶瓷样品相对密度基本不变。

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.

基金信息：国家重点基础研究发展规划资助项目
国家自然科学创新团队基金资助项目