摘要
研究了在 15 0 0℃的流动氮气中 ,用Al粉、Si粉、Al2 O3粉、刚玉和SiC的颗粒及细粉直接制备 β Sialon -Al2 O3-SiC系复相材料的氮化烧结技术。XRD和SEM分析表明 ,结合相 β Sialon的显微形貌随刚玉量的增加由纤维状向棱柱状转变 ,发育良好。复相材料的高温抗折强度高于常温抗折强度。抗热震试验结果显示 :添加适量的刚玉对β Sialon -SiC复相材料和添加适量的SiC对β Sialon -刚玉 复相材料都具有良好的增韧效果 ,这是β Sialon的纤维增强及柱状晶体原位自补强增韧和复合弥散相增韧综合作用的结果。抗碱和抗高炉渣试验均显示了该复相材料优良的抗碱和抗铁渣侵蚀能力。
The nitridation sintering technique of β Sialon-Al 2 O 3 -SiC composites was studied by using Si powder,Al powder,Al 2 O 3 fine powder,corundum and SiC particles as raw materials at 1500 ℃ under flowing nitrogen.SEM and XRD analysis confirm that the microstructure of β Sialon as bonding phase changes from fiber like to hexagonal prism like depending on the increasing amount of corundum.The hot MOR of the composites at 800～1400 ℃ is higher than CMOR.Study on hot strength and thermal shock resistance reveals that appropriate addition of corundum and SiC respectively can improve strength and fracture toughness of β Sialon bonded SiC material and β Sialon bonded corundum material respectively.This is believed to be attributed to the in situ self toughening and self strengthening by β Sialon and the effects of strengthening and toughening by the dispersion phase.On the other hand,β Sialon-Al 2 O 3 -SiC composites also show excellent resistances to alkali and slag of blast furnace.
出处
《耐火材料》
CAS
北大核心
2002年第1期1-4,共4页
Refractories
