烧结气氛对SiC/Al_2O_3复相陶瓷力学性能与抗热震性的影响  被引量:4

Effects of Sintering Atmosphere on Mechanical Properties And Thermal Shock Resistance of SiC/Al_2O_3 Ceramics

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作  者:王大磊[1] 李瑞锋[1] 陈涵[1] 郭露村[1] 

机构地区:[1]南京工业大学材料科学与工程学院,江苏南京210009

出  处:《陶瓷学报》2013年第4期409-414,共6页Journal of Ceramics

基  金:长江学者和创新团队发展计划(编号:PCSIRT;IRT1146);江苏高校优势学科建设工程资助项目(PAPD)

摘  要:研究了N2和空气气氛对SiC/Al2O3致密陶瓷材料的抗弯强度、断裂韧性与抗热震性等性能的影响及空气中SiC/Al2O3的氧化特性。利用万能实验机测试试样的力学性能;陶瓷材料抗热震性自动测试仪测试材料的抗热震指数;并用XRD、SEM对样品的物相组成、微观形貌进行表征。结果表明:N2气氛下烧成试样强度(最高达479.86MPa)明显优于空气气氛;而在空气气氛中,SiC的加入明显改善了材料的抗热震性能(抗热震指数Г最高达32.98,纯Al2O3的Г为23.83);微米级SiC在低温下抗氧化效果优于纳米SiC,在1600℃空气中微米级SiC基本完全氧化。XRD表征显示:在空气中SiC发生氧化后与氧化铝反应生成了莫来石,从而改善了材料的抗热冲击性。The effects of nitrogen and air atmosphere on flexural strength,fracture toughness,thermal shock resistance and oxidation properties of SiC/Al2O3 ceramics were investigated.The mechanical properties of the samples were characterized by a universal testing machine; the indexes of thermal shock resistance of the samples were determined by an automatic thermal shock resistance tester; the composition and microstructure were studied by an X-ray diffractometer (XRD) aand a scanning electron microscope (SEM); SiC oxidation degrees were analyzed by mass difference method.The experimental results showed that the samples sintered in nitrogen had higher strength than in air (the highest strengthen reached 479.86 MPa); SiC additive improved the thermal shock resistance of the material (the highest index of thermal shock resistance Γreached 32.98 while the r of pure Al2O3 was 23.83).The results also showed that micro-sized SiC had better oxidation resistance than nano-scale SiC at low temperature,micro-sized SiC was oxidized totally in the air at 1600℃.XRD results revealed that the oxidized SiC then further reacted with alumina to form mullite,which improved its thermal shock resistance.

关 键 词:碳化硅 氧化铝 烧结气氛 力学性能 抗热震性 

分 类 号:TQ174.75[化学工程—陶瓷工业]

 

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