A silicoboron carbonitride ceramic stable to 2,000 degrees C

被引:670
作者
Riedel, R [1 ]
Kienzle, A [1 ]
Dressler, W [1 ]
Ruwisch, L [1 ]
Bill, J [1 ]
Aldinger, F [1 ]
机构
[1] MAX PLANCK INST MET RES,INST WERKSTOFFWISSENSCH,PULVERMET LAB,D-70569 STUTTGART,GERMANY
关键词
D O I
10.1038/382796a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
CERAMICS based on silicon nitride and carbide are strong and stable at high temperatures, and are therefore under investigation for the fabrication of motor and turbine parts(1-3). But silicon nitride decomposes at about 1,400 degrees C in vacuum and 1,775 degrees C in 0.1 MPa nitrogen(4,5), limiting the high-temperature range of its technological uses. Here we describe a boron-containing silicon nitride/carbide ceramic that does not degrade at temperatures up to 2,000 degrees C even in nitrogen-free environments. We synthesize the material in a polymer-to-ceramic transformation(6) from a single polymeric polyborosilazane precursor. On heating at 1,000 degrees C in argon we obtain a ceramic with the composition Si3.0B1.0C4.3N2.0. The ceramic begins to convert to a polycrystalline composite of silicon nitride and carbide (with some non-crystalline boron nitride) at 1,700 degrees C, a process that is completed (without substantial change in elemental composition) at 2,000 degrees C.
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页码:796 / 798
页数:3
相关论文
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