摘要
采用超重力场辅助自蔓延高温合成(SHS)技术,实现了TiC-TiB_2-Fe细晶凝固陶瓷与42CrMo合金钢的熔化连接,并制备出具有连续梯度特征的陶瓷/合金钢层间复合材料。陶瓷/合金钢层间接头组织表明:正是超重力场辅助SHS的爆燃特性,使得合金钢表面发生熔化,进而发生熔融态陶瓷、合金钢液相层间的原子互扩散现象;在陶瓷/合金钢连接区形成Ti C和Fe基合金呈相间分布且细小TiB_2片晶镶嵌其上的凝固组织,并使陶瓷/合金钢界面呈现连续梯度特征,使陶瓷/合金钢的界面剪切强度达到355±50 MPa;层间连续梯度复合材料硬度从陶瓷至合金钢则呈抛物线下降趋势。
Fusion bonding of TiC-TiB2-Fe ceramic with 42 CrMo was achieved by introduction of 42 CrMo plate at the bottom of self-propagating high-temperature synthesis(SHS)in high-gravity field,meanwhile,the solidified TiC-TiB2-Fe ceramic with fine grain was prepared.Furthermore,continuous-graded laminated composite of TiC-TiB2-Fe/42 CrMo was obtained.The microstructure of fusion bonding of TiC-TiB2-Fe/42 CrMo indicates that,the presence of chemical reaction in explosive combustion makes 42 CrMo surface partially fused.Then atomic inter-diffusion occurs spontaneously between liquid ceramic and molten steel,resulting in the achievement of continuous-graded laminated composite.Microstructure analysis shows that in the bonding joint,Ti C and Fe alloy are distributed homogeneously with fine Ti B2 grains embedded in solidified matrix.Shear strength of 355±50 MPa is achieved between the ceramic and steel.Vickers hardness distributing reveals the quasi-parabola relationship in the transition region.
作者
彭文斌
赵忠民
尹德军
PENG Wenbin;ZHAO Zhongmin;YIN Dejun(Special Ceramics Laboratory,Ordnance Engineering College,Shijiazhuang 050003,China;Department of Artillery Engineering,Ordnance Engineering College,Shijiazhuang 050003,China)
出处
《热加工工艺》
北大核心
2019年第8期119-122,共4页
Hot Working Technology
关键词
陶瓷/金属连续梯度复合材料
自蔓延高温合成
熔化连接
原子互扩散
continuo us-graded laminated composite of ceramic with metal
self-propagating high-temperature synthesis
fusion bonding
atomic interdiffusion
