材料工程2024，Vol.52Issue(2)：164-171,8.DOI:10.11868/j.issn.1001-4381.2023.000035
Ti预处理的SiCf/SiC与镍基高温合金复合铸件的界面组织与强度
Microstructure and strength of composite casting interface between Ti pretreated SiCf/SiC and Ni-based superalloy
摘要
Abstract
The integrated castings fabricated by SiCf/SiC composite and K403 Ni-based superalloy melt exhibited spontaneous fracture when cooled to room temperature.The integrated forming of SiCf/SiC and K403 Ni-based superalloy and their firmly bonded interface were successfully realized by pretreatment of SiCf/SiC surface using Ti powder embedded coating infiltration process at 1100℃and ceramic mold precision casting with K403 superalloy melt under appropriate process.The results show that the Ti pretreatment layer has an average thickness of about 17 μm and microscopic structure including TiC,Ti3SiC2,Ti5Si3Cx and SiC phases owing to Ti permeation,diffusion and reaction to SiCf/SiC.After composite casting of the pretreated SiCf/SiC and high temperature nickel base metallic liquid,the pretreatment layer is evolved into the interface reaction layer with a thickness of about 120 μm and the typical microstructure composed of Ni2Si,C,Al4C3 and MC(M containing mainly Ti and a small amount of Cr,Mo,W).The existence of pretreatment layer alleviates the harmful graphitization reaction between Ni and SiC,and the thermal shock of the high temperature melt on SiCf/SiC during casting;the formed interface reaction layer reduces the interface thermal stress caused by the mismatch of thermal expansion coefficients.Consequently,the room temperature shear strength of the interface in the integrated casting of SiCf/SiC and K403 reaches 63.5 MPa.关键词
SiCf/SiC/K403/镍基高温合金/一体化铸造/复合铸造/Ti预处理层Key words
SiCf/SiC/K403/Ni-based superalloy/integrated casting/composite casting/Ti pretreatment layer分类
矿业与冶金引用本文复制引用
林国标,朱付虎,赵斯文..Ti预处理的SiCf/SiC与镍基高温合金复合铸件的界面组织与强度[J].材料工程,2024,52(2):164-171,8.基金项目
中央高校基本科研业务费专项资金资助(FRF-GF-18-006A) （FRF-GF-18-006A）
