| 引用本文: | 李群力,宋永才.Si-N-C 陶瓷的组成、结构与其热稳定性….[J].国防科技大学学报,1993,15(4):23-29.[点击复制] |
| Li Qun1i,Song Yongcai.The Composition，Structure and Thermal Stability of Si-N-C Ceramics[J].Journal of National University of Defense Technology,1993,15(4):23-29[点击复制] |
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| Si-N-C 陶瓷的组成、结构与其热稳定性… |
| 李群力, 宋永才 |
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(材料科学与应用化学系)
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| 摘要: |
| 本文研究了由聚硅氮烷 (PSZ)和聚碳硅烷(PC)热解制得的三种陶瓷的组成、结构与特性。研究表明，PC热解到 1250℃产生 Si-C 陶瓷，其结晶相是β-SiC 微晶，PSZ在N2或NH3气氛中热解则分别产生 Si-N-C 与 Si-N 无定形陶瓷。这三种陶瓷在Ar2气中1300℃到 1500℃处理以研究其热稳定性。结果证明 Si-C 陶瓷从微晶变为β-SiC 结晶态，Si-N 陶瓷从无定形态变为α-Si3N4结晶并伴随着可观测到的重量损失而 Si-N-C 陶瓷维持其元素组成及β-SiC 微晶态直到1500℃。 |
| 关键词: 聚硅氮烷，热分解，氮化硅，碳化硅，热稳定性 |
| DOI： |
| 投稿日期：1992-07-25 |
| 基金项目:国家教委青年教师基金资助项目 |
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| The Composition，Structure and Thermal Stability of Si-N-C Ceramics |
| Li Qun1i, Song Yongcai |
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(Department of Materia1s Science and App1ied Chemistry)
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| Abstract: |
| The composition，structure and properties of three kinds of ceramics obtained by the pyro1ysis of po1ysilazane (PSZ) and po1ycarbosi1ane (PC) have been studied. The pyro1ysis of PC to 1250℃ yie1ds Si-C ceramic，which is β-SiC microcrysta1，and the pyro1ysis of PSZ in N2 or NH3 atmosphere yie1ds Si-N-C and Si-N amorphous ceramics respective1y. The three kinds of ceramics were heat-treated between 1300℃ and 1500℃ in Ar gas to examine their therma1 stabi1ity，the result shows that Si-C ceramic changes from microcrysta1 to β-SiC crystalline and Si-N ceramic from amorphous to a-Si3N4，accompained by the observab1e weight loss whi1e Si-N-C ceramic retains its e1ementa1 composition and β-SiC microcrystalline states up to 1500℃. |
| Keywords: pyro1ysis,si1icon nitride,si1icon carbide,therma1 stability,po1ysi 1azane |
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