B_4C-部分石墨化炭黑复合粉体的合成及其抗氧化性  

Preparation and oxidation resistance of B_4C-partly graphitized carbon black compound powders

作　　者：朱伯铨[1] 姚亚双[1] 张文杰[1] 

机构地区：[1]武汉科技大学耐火材料与高温陶瓷湖北省重点实验室,武汉430081

出　　处：《耐火材料》2006年第5期321-323,328,共4页Refractories

基　　金：武汉市科技局资助项目(20061002052)

摘　　要：分别以64.7%的硼粉＋35.3%的炭黑或55%的硼粉＋45%的炭黑为试样组成,分别在真空和非真空条件下,采用自蔓延燃烧法于1400 ℃保温10～20 min进行了B4C-部分石墨化炭黑复合粉体的合成研究.采用XRD、SEM 及电子探针等方法对合成粉体的物相及形貌进行了分析;以差热法（TG-DSC）研究了合成粉体的氧化特性.结果表明：炭黑和硼粉加入量（w）分别为45%和55%时,经自蔓延燃烧反应后可以得到粒度均匀的碳化硼（B4C）粉体,且碳黑已部分石墨化.与工业B4C相比,复合粉体中的B4C具有更好的保护碳不被氧化的特性.The B4C -partly graphitized carbon black compound powders were prepared with starting materials of 64.？%boron powder ＋35.3% carbon black or 55% boron powder ＋45%carbon black by firing at 1400 ℃ for 10- 20 min through self-propagating combustion method in vacuum and non-vacuum condition respectively. The phase composition and microstructure of compound powders were investigated by XRD, SEM and electron probe;and the oxidation characteristics were researched by TG -DSC method. The results show that：B4C powder with uniform size distribution is prepared with 45% carbon black ＋55% boron powder,and the carbon black is partly graphitized. Compared with industrial B4C,the B4C in compound powders can provide better protection for carbon against oxidation.

关 键 词：自蔓延燃烧合成 炭黑 碳化硼 石墨化 抗氧化性 

分 类 号：TQ174.758[化学工程—陶瓷工业]