摘要
采用冷压-烧结技术制备了CaO掺杂的10NiO-NiFe2O4复合陶瓷，研究了CaO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CaO掺杂量为0～4％（质量分数）时，烧结样品中主要含有NiO和NiFe2O4两种，CaO与10NiO-NiFe2O4陶瓷组分反应并形成低熔点相，且Ca^2＋离子固溶到基体组分中，促进致密化烧结，降低了烧结温度；当CaO掺杂量为4％时，过剩的CaO存在于陶瓷颗粒间，抑制了致密化过程的进行；于1200℃烧结时，2％CaO掺杂样品的相对密度最大，达到98．75％，比未掺杂样品的相对密度提高近24％；当烧结温度从1200当升高到1400℃时，CaO掺杂量为0、0．5％和1．0％的样品相对密度提高20％以上，但当CaO掺杂量为2％和4％时，陶瓷样品相对密度反而下降，且晶粒明显长大。
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 Ca^2＋ 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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2006年第8期1355-1360,共6页
The Chinese Journal of Nonferrous Metals
基金
国家重点基础研究发展规划资助项目(2005CB623703)
国家自然科学基金资助项目(50474051)
湖南省自然科学基金资助项目(03JJY3080)
