文章信息/Info

Title:

Fabrication and application of laminated SiCw/SiC structure ceramics

作者:

解玉鵬; 成來飛 ; 張立同

西北工業大學 材料學院

Author(s):

XIE Yupeng' target="_blank" rel="external">’sans-serif’">XIE Yupeng;  CHENG Laifei*;  ZHANG Litong

School of Materials Science and Engineering, Northwestern Polytechnical University

關鍵詞:

化學氣相滲透; 流延法; SiC; SiCw/SiC層狀結構陶瓷; 強韌性

DOI:

10.7502/j.issn.1674-3962.2015.06.04

文獻標志碼:

A

摘要:

提出了采用流延法(Tape Casting，TC)結合化學氣相滲透法(Chemical Vapor Infiltration，CVI)制備SiCw/SiC層狀結構陶瓷的方法，分析了TC-CVI方法的特點，闡述了SiCw/SiC層狀結構陶瓷的強韌化機理及其應用。結果表明：TC-CVI制備方法通過提高晶須體積分數和減少對晶須的損傷來提高材料的強度；通過控制層內和層間界面結合強度來提高材料的韌性。與傳統熱壓燒結工藝制備的層狀結構陶瓷相比，TC-CVI制備的SiCw/SiC層狀結構陶瓷中晶須含量可達40 vol.%，其主要增韌機制為層間和層內裂紋偏轉、裂紋橋接和晶須拔出等。該材料具有較高的彎曲強度、拉伸強度和斷裂韌性，表現出良好的線性變形行為。TC-CVI工藝為制備航空發動機葉片提供了一種可行方法。

Abstract:

Tape Casting (TC) combined with chemical vapor infiltration (CVI) was proposed to fabricate laminated SiCw/SiC structural ceramics, the advantages of TC-CVI were analyzed and the strengthening/toughening mechanisms and the application of the ceramics were investigated. The results showed that this method can increase strength of the ceramics by increasing their volume fraction and reducing the damage of SiC whiskers, and increase toughness of the ceramics by controlling the interfacial bonding between whiskers and matrix and inter-laminar bonding between layers. Comparing with laminated structural ceramics fabricated by hot-press sintering method, laminated SiCw/SiC structural ceramics fabricated by TC-CVI had 40 vol.% whiskers, in which the main toughening mechanisms of the ceramics were interlaminar and interfacial crack deflection and bridging and whisker pull-out. The ceramics had higher flexural strength, tensile strength and fracture toughness, and showed a good linear deformation behavior. TC-CVI process provided a feasible method for fabrication of aero engine blade.