摘要
采用重力分离SHS法制备了陶瓷内衬煤粉喷枪枪管．试验得出，陶瓷层主要由构成枝晶的α-Al2O3基体相和分布于其间的Feo·Al2O3尖晶相所组成，SiO2主要以石英相结构存在于枝晶晶界上；在反应物料中加入适量的SiO2和Cr2O3均可有效地提高内衬陶瓷层的相对密度；SiO2将使陶瓷层的硬度和复合钢管的抗压剪强度降低，Cr2O3却使二者均有所回升；在内衬陶瓷层中分布着径向裂纹和网状裂纹，加入SiO2将减少裂纹密度，Cr2O3却使裂纹密度增加.
Ceramic-lined coal-spurting gun pipes have been produced by gravitational separation SHS method. It is found that Ceramic layers are mainly composed of α-Al2O3 matrix phases assuming dendritic crystals and FeO·Al2O3 spinel phases distributed at dendritic boundary area,Sio2 in ceramics exists in the form of quartz phases at dendritic boundary. Adding SiO2 and CtO3 in thermit mixtures can effectively increase relative density of ceramic layers. SiO2 will reduce ceramic hardness and compressive shear strength of pipes, whereas CrO3 will increase two sides in certain degrees. Radial cracks and net cracks are observed on creamic layers. Adding SiO2 reduces cracks density. CrO3 increases crack desity on ceramic layers.
出处
《材料科学与工艺》
EI
CAS
CSCD
1999年第1期67-71,共5页
Materials Science and Technology
基金
军械工程学院科研基金!YJJXM 98006
