Al/Si复合粉包覆改性刚玉颗粒对Al_(2)O_(3)-C材料性能的影响  

Effect of Al/Si composite powder coating modified corundum particles on properties of Al_(2)O_(3)-C materials

作　　者：刘洋 刘宝亮 石凯[1] 马世行 商剑钊 夏熠[1] Liu Yang;Liu Baoliang;Shi Kai;Ma Shihang;Shang Jianzhao;Xia Yi(School of Materials Science and Engineering,Henan University of Technology,Zhengzhou 450001,Henan,China;不详)

机构地区：[1]河南工业大学材料科学与工程学院,河南郑州450001 [2]河南省工业学校,河南郑州450011

出　　处：《耐火材料》2023年第2期153-156,共4页Refractories

基　　金：河南省科技厅科技研发专项(212102210579)。

摘　　要：首先,以3~1 mm的板状刚玉颗粒,Al粉、Si粉质量比分别为4∶0、3∶1、2∶2的Al/Si复合粉,以及酚醛树脂-乙二醇混合液为原料,通过搅拌、180℃烘烤、解体制成Al/Si复合粉包覆改性板状刚玉颗粒。然后,按常规工艺制备Al_(2)O_(3)-C试样,检测试样的常温和高温性能,分析试样的物相组成和显微结构。结果表明:1)在Al_(2)O_(3)-C材料中加入Al/Si复合粉包覆改性刚玉颗粒,可提高材料的致密度、常温强度、高温强度、抗热震性和抗氧化性;Al/Si复合粉中Al粉、Si粉的质量比以3∶1最佳。2)改性板状刚玉颗粒表面的Al粉和Si粉填充在颗粒表面的凹陷处,提高了试样的成型致密度以及烘烤后和埋炭热处理后试样的致密度、强度和抗氧化性;高温埋炭热处理后,这些Al粉和Si粉反应生成AlN、Al_(4)C_(3)、SiC等非氧化物,增强了改性刚玉颗粒与基质的结合,提高了试样的抗热震性和强度。First,Al/Si composite powder coating modified corundum particles were prepared using tabular corundum particles(1-3 mm),Al/Si composite powder(mass ratio of Al powder to Si powder=4∶0,3∶1 or 2∶2),and phenolic resin-ethylene glycol mixed solution as raw materials,stirring,baking at 180 ℃ and disintegrating.Then,Al_(2)O_(3)-C samples were prepared according to the conventional process.The cold and hot properties of the samples were tested.The phase composition and the microstructure were analyzed.The results show that:(1)adding Al/Si composite powder coating modified corundum particles into Al_(2)O_(3)-C samples can improve their density,cold and hot strengths,thermal shock resistance and oxidation resistance;the Al/Si composite powder with the mass ratio of Al powder to Si powder of 3∶1 is the optimum;(2)the Al powder and the Si powder fill in the depressions on the surface of the modified tabular corundum particles,which improves the forming density of the samples as well as the density,the strength and the oxidation resistance of the samples after baking and carbon embedded heat treatment;after high temperature carbon embedded heat treatment,the Al powder and the Si powder react to form non-oxides such as AlN,Al_(4)C_(3) and SiC,which enhance the bonding of the modified corundum particles and the matrix,thus improving the thermal shock resistance and the strength of the samples.

关 键 词：Al_(2)O_(3)-C材料 包覆改性 刚玉颗粒 非氧化物 结合强度 

分 类 号：TQ175[化学工程—硅酸盐工业]