纳米TiC加入量对TiC高温陶瓷烧结和力学性能的影响

耐火材料 , 2013, 47(6): 410-413. doi: 10.3969/j.issn.1001-1935.2013.06.003

纳米TiC加入量对TiC高温陶瓷烧结和力学性能的影响

徐广平 ^1, , 宋一华 ^2, , 何江荣 ^3, , 程利霞 ^4, , 谢志鹏 ^5,

1.东台市节能耐火材料厂江苏东台224213

2.东台市节能耐火材料厂江苏东台224213

3.东台市节能耐火材料厂江苏东台224213

4.清华大学材料学院北京100084

5.清华大学材料学院北京100084

关键词： TiC陶瓷 , 放电等离子体烧结(SPS) , 纳米TiC , 烧结性 , 力学性能

Effect of nano-TiC addition on sinterability and mechanical properties of TiC high temperature ceramics

Xu Guangping ^1, ,

1.东台市节能耐火材料厂江苏东台224213

Keywords： titanium carbide ceramics , spark plasma sintering , nano-titanium carbide , sinterability , mechanical property

为研究纳米TiC在烧结过程中对TiC基体烧结和力学性能的影响,在粒径约3μm的TiC微粉中分别添加质量分数为0、10％、20％、50％、90％的纳米TiC,采用放电等离子体烧结工艺(于1 600℃烧结5 min,烧结压力50 MPa)制备出了TiC高温陶瓷.利用阿基米德排水法、SEM、压痕法等测试手段表征烧结后陶瓷的烧结性、显微结构及力学性能,并从致密度和显微结构的变化讨论了纳米TiC加入量对TiC陶瓷烧结的影响,从硬度和断裂韧性的变化探讨了纳米TiC量对其力学性能的影响.结果表明:纳米TiC在基体中的分散性是影响TiC陶瓷烧结性和力学性能的主要原因,加入少量(10％质量分数)纳米TiC时,分散性较好,有助于提高TiC陶瓷的烧结性和力学性能;添加纳米TiC可以明显细化TiC陶瓷的显微结构组织;当纳米TiC质量分数为10％时,TiC陶瓷的断裂韧性最大,呈现明显的裂纹偏转、桥接等增韧机制.

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