Polymer-derived ceramic coatings on C/C-SiC composites

被引：46

作者：

Bill, J ^{[1
]}

Heimann, D ^{[1
]}

机构：

[1] UNIV STUTTGART,INST NICHTMET ANOGAN MAT,D-70569 STUTTGART,GERMANY

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 1996年 / 16卷 / 10期

关键词：

D O I：

10.1016/0955-2219(96)00025-8

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A protective coating has been developed to enhance the oxidation stability of C fibre reinforced SiC (C/C-SiC). The coating was prepared by pyrolysis of a polysilazane layer, which was obtained by dip-coating. Silicon powder was added to the polysilazane solution to prevent shrinkage during pyrolysis. The ceramic coating was characterized regarding layer thickness, adhesion, and oxidation protection for C-fibres. Under the prevailing conditions the thickness of the ceramic layer was determined to be up to 5 mu m after one coating-pyrolysis cycle and could be increased by further coating. Additionally, the thickness could be varied by changing the viscosity of the polymer solution as well as the withdrawal speed. The highest values measured for the adhesion of the ceramic coating on the substrate were 14 MPa. The lifetime of the composite material at high temperatures in air could be increased by up to 120% with the coating, compared with the uncoated samples. (C) 1996 Elsevier Science Limited.

引用

页码：1115 / 1120

页数：6

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