Ti_3SiC_2/TiC陶瓷复合材料高温压缩性能  

Study of High-Temperature Compressive Deformation of Ti_3SiC_2/TiC Ceramics Composites

作　　者：张灵振[1] 石随林[1] 

机构地区：[1]军械工程学院基础部理化教研室,河北石家庄050003

出　　处：《稀有金属材料与工程》2007年第A01期218-220,共3页Rare Metal Materials and Engineering

摘　　要：以Ti3SiC2和TiC粉为原料,采用热压烧结方法,在外加应力25MPa,烧结温度1300℃条件下,制备了Ti3SiC2/TiC陶瓷复合材料,并研究了复合材料的高温压缩性能。实验结果表明,复合材料在恒应变速率下出现了明显的屈服现象,并呈现塑性变形特征;复合材料在低于韧脆转变温度时其断裂方式主要是脆性断裂,当变形温度达到韧脆转变温度后,复合材料产生大量塑性变形,同时材料的强度明显降低。Ti3SiC2/TiC ceramics composite with 45% volume fraction of Ti3SiC2 was fabricated at 1300 ℃ by hot-pressing under a pressure of 25 MPa. The compressive deformation properties of the composite at high-temperature were investigated. The results showed that the composite exhibits the characteristic of yielding and plastic deformation at the constant strain rate. The composite demonstrates brittle fracture mode as the deformation temperature is below the plastic-to-brittle transition temperature, whereas the composite behaves as the significant plastic deformation and its strength is decreased obviously as the deformation temperature reaches the plastic-to-brittle transition temperature.

关 键 词：Ti3SiC2/TiC 复合材料 高温压缩性能 

分 类 号：TB33[一般工业技术—材料科学与工程]