Effect of intermediate heat treatment on mechanical properties of SiCf/SiC composites with BN interphase prepared by ICVI

Abstract SiCf/SiC composites with BN interface were prepared through isothermal–isobaric chemical vapour infiltration process. Room temperature mechanical properties such as tensile, flexural, inter-laminar shear strength and fracture toughness (KIC) were studied for the composites. The tensile strength of the SiCf/SiC composites with stabilised BN interface was almost 3.5 times higher than that of SiCf/SiC composites with un-stabilised BN interphase. The fracture toughness is similarly enhanced to 23 MPa m1/2 by stabilisation treatment. Fibre push-through test results showed that the interfacial bond strength between fibre and matrix for the composite with un-stabilised BN interface was too strong (>48 MPa) and it has been modified to a weaker bond (10 MPa) due to intermediate heat treatment. In the case of composite in which BN interface was subjected to thermal treatment soon after the interface coating, the interfacial bond strength between fibre and matrix was relatively stronger (29 MPa) and facilitated limited fibre pull-out.

[1]  R. Naslain,et al.  Boron Nitride Interphase in Ceramic‐Matrix Composites , 1991 .

[2]  Xavier Bourrat,et al.  Synthesis of highly tailored ceramic matrix composites by pressure-pulsed CVI , 2001 .

[3]  F. Rebillat,et al.  Oxidation resistance of SiC/SiC micro and minicomposites with a highly crystallised BN interphase , 1998 .

[4]  Anthony G. Evans,et al.  Overview no. 85 The mechanical behavior of ceramic matrix composites , 1989 .

[5]  K. Faber.  CERAMIC COMPOSITE INTERFACES: Properties and Design , 1997 .

[6]  G. Morscher.  Tensile Stress Rupture of SiCf/SiCmMinicomposites with Carbon and Boron Nitride Interphases at Elevated Temperatures in Air , 2005 .

[7]  K. Tsou,et al.  Synthesis of Bromo-substituted Indoxyl Esters for Cytochemical Demonstration of Enzyme Activity1 , 1960 .

[8]  Walter Krenkel,et al.  High Temperature Ceramic Matrix Composites , 2002 .

[9]  R. Erre,et al.  Characterization of boron nitride films deposited from BCl3-NH3-H2 mixtures in chemical vapour infiltration conditions , 1994, Journal of Materials Science.

[10]  Jacques Lamon,et al.  Fracture Toughness of 2‐D Woven SiC/SiC CVI‐Composites with Multilayered Interphases , 1996 .

[11]  Lai-fei Cheng,et al.  High toughness, 3D textile, SiC/SiC composites by chemical vapor infiltration , 2001 .

[12]  M. Leparoux,et al.  Influence of Isothermal Chemical Vapor Deposition and Chemical Vapor Infiltration Conditions on the Deposition Kinetics and Structure of Boron Nitride , 2004 .

[13]  J. Sakamoto,et al.  Microstructure and oxidative degradation behavior of silicon carbide fiber Hi-Nicalon type S , 1998 .

[14]  K. Chawla.  Ceramic Matrix Composites , 2019, Composite Materials.

[15]  A. Evans,et al.  Failure Mechanisms in Ceramic‐Fiber/Ceramic‐Matrix Composites , 1985 .

[16]  M. Lewis,et al.  Inhibition of intermediate temperature degradation of calcium aluminosilicate/Nicalon by high temperature pretreatment , 1993 .

[17]  R. Naslain.  Fibre-matrix interphases and interfaces in ceramic matrix composites processed by CVI , 1993 .

[18]  M. Rand,et al.  Preparation and Properties of Thin Film Boron Nitride , 1968 .

[19]  Xavier Bourrat,et al.  Boron-bearing species in ceramic matrix composites for long-term aerospace applications , 2004 .

[20]  A. Kohyama,et al.  Effect of residual silicon phase on reaction-sintered silicon carbide , 2012 .

[21]  F. Rebillat,et al.  Microstructural and microtextural investigations of boron nitride deposited from BCl3–NH3–H2 gas mixtures , 2004 .

[22]  A. D'Amico,et al.  Preparation, properties and applications of boron nitride thin films , 1988 .

[23]  M. Leparoux,et al.  Oxidizing environment influence on the mechanical properties and microstructure of 2DSiC/BN/SiC composites processed by ICVI , 1998 .

[24]  Xavier Bourrat,et al.  TEM structure of (PyC/SiC)n multilayered interphases in SiC/SiC composites , 2000 .

[25]  R. E. Tressler.  Recent developments in fibers and interphases for high temperature ceramic matrix composites , 1999 .

[26]  Triplicane A. Parthasarathy,et al.  Interface Design for Oxidation‐Resistant Ceramic Composites , 2004 .

[27]  R. Naslain,et al.  The design of the fibre-matrix interfacial zone in ceramic matrix composites , 1998 .

[28]  N. Bansal.  Handbook of Ceramic Composites , 2005 .

[29]  T. Matsuda.  Stability to moisture for chemically vapour-deposited boron nitride , 1989 .

[30]  J. Yang,et al.  Thermal stability of ceramic fibre in a CVI-processed SiC matrix composite , 1991 .

[31]  K. Luthra,et al.  Chemical Vapor Deposition of Boron Nitride , 1992 .

[32]  J. Lamon,et al.  Strong Interface in CMC s , a Condition for Efficient Multilayered Interphases , 1994 .

[33]  J. Economy,et al.  Oxidative and hydrolytic stability of boron nitride — A new approach to improving the oxidation resistance of carbonaceous structures , 1995 .