摘要
以Cr2O3微粉、TiO2微粉、金属铬粉为原料,聚乙烯醇(PVA)为结合剂,经喷雾造粒、冷等静压成型后,采用标准氮气和氧气的混合气体控制气氛,其氧分压分别控制在1 010、10.1 Pa,1 450℃保温3 h烧成,研究了金属铬粉加入量(其质量分数分别为0、0.5%、1.0%、1.5%和2.0%)对致密氧化铬材料烧结性能的影响。结果表明:添加0.5%的金属铬粉可明显降低试样内部氧分压,且由于此时氧化反应引起的膨胀小,致密氧化铬材料在1 010和10.1 Pa的较高氧分压下即可实现致密化烧结;致密氧化铬材料中引入的金属铬粉不宜过多,否则金属铬粉氧化发生的膨胀反应会导致材料的性能下降。
The specimens were prepared using Cr203 micropowder, TiO2 micropowder and chromium powder as starting materials, PVA as binder, after spraying granulation and cold isostatic pressing, firing at 1 450 ℃ for 3 h at standard nitrogen and oxygen control atmosphere（oxygen partial pressure was 1010 and 10.1 Pa respectively）. Effects of chromium powder （ mass percent were 0,0.5%, 1. 0%, 1. 5% and 2.0%, respectively） on sintering behaviors of Cr2O3 materials were researched. The results showed that. addition of 0.5% chromium powder could obviously decrease the oxygen partial pressure in the specimens. Meanwhile, because the expansion caused by the oxidation reaction was smalI,Cr2O3 materials could realize the densification sintering at higher oxygen partial pressure （ 1 010 and 10. 1 Pa）. The chromium powder addition in Cr2O3 materials shouldn＇t be excessive,otherwise,the expansion reaction occupied a dominant position, which would decrease the properties of the materials.
出处
《耐火材料》
CAS
北大核心
2009年第2期117-119,共3页
Refractories
