文章信息/Info

Title:

Microstructure Characterization of C_f/ZrC-ZrB₂-SiC-C Ultrahigh Temperature Ceramic Matrix Composites

作者:

周延春; 張偉剛; 鄭麗雅

（1.航天材料及工藝研究所 先進功能復合材料技術重點實驗室，北京100076）��
(2.中國科學院過程研究所，北京 100190)��
(3.中國科學院金屬研究所，遼寧 沈陽110016）

Author(s):

ZHOU Yanchun;  ZHANG Weigang;  ZHENG Liya

（1.Science and Technology of Advance Functional Composite Laboratory, Aerospace Research Institute of ��Materials & Processing Technology, Beijing 100076, China)��
(2.Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China)��
(3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）

關鍵詞:

超高溫陶瓷; 復合材料; 顯微結構; 界面

DOI:

10.7502/j.issn.1674-3962.2012.08.04

文獻標志碼:

A

摘要:

利用X-射線衍射、掃描電子顯微鏡和透射電子顯微鏡對C_f/ZrC-ZrB₂-SiC-C超高溫陶瓷復合材料的相組成、纖維/熱解碳層的界面特征和超高溫陶瓷基體的顯微結構特征進行了表征。在碳纖維表面有一層厚度為2~3 μm石墨化程度較高的熱解碳界面層，該界面層可以避免采用PIP工藝制備超高溫陶瓷基體時可能對碳纖維造成的損傷。熱解碳層與碳纖維之間為弱機械結合，其界面間分布著20~30 nm的ZrC納米顆粒。C_f/ZrC-ZrB₂-SiC-C超高溫陶瓷復合材料基體主要由ZrC，ZrB��2，SiC和石墨相（C�璯）組成。基體中石墨的（002）面沿著ZrC，ZrB��2或SiC的表面生長。在石墨與ZrB��2和石墨與SiC的界面沒有觀察到取向關系，界面處既沒有反應層也沒有非晶相存在。在石墨與ZrC之間存在ZrC (111) ∥C�璯 (002)，ZrC ［11〖TX-〗0］∥C�璯［010］的取向關系。 ZrB��2和SiC之間也沒有界面反應和非晶層存在。��

Abstract:

The phase composition and microstructure features of a C_f/ZrC-ZrB₂-SiC-C ultrahigh temperature ceramic matrix composite were characterized using X�瞨ay diffraction, scanning electron microscopy and transmission electron microscopy. A PyC layer of 2~3 μm in thickness, which was prepared by the CVI process, was observed as the interfacial layer between carbon fiber and the ultrahigh temperature ceramic matrix. The well crystallization combined the good thermal stability of this PyC layer protected the carbon fiber from damage during the cyclic PIP process to make the C_f/ZrC-ZrB₂-SiC-C composites. Nanocrystalline ZrC particles of 20-30 nm in size were observed at the interface between carbon fiber and the PyC layer, ensuring the weak bonding between carbon fiber and the PyC layer. ZrC, ZrB��2,SiC and graphite were �﹊dentified�� in the matrix of theC_f/ZrC-ZrB₂-SiC-C composite. It was observed that the (002) plane of graphite was parallel to the surfaces of ZrB��2 and SiC. No reaction layer or amorphous layer was detected at the interfaces between ZrB��2 〖JP2〗and graphite, SiC and graphite, and ZrB��2/SiC. An orientation relationship of ZrC (111) ∥C�璯 (002)，ZrC ［110］∥C�璯［010］ was observed〖JP+1〗 between ZrC and graphite.