(東北大學(xué) 材料各向異性與組織結(jié)構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室，沈陽 110004)
摘 要: 采用真空熱壓燒結(jié)方法制備Al2O3/Ti(C,N)-Ni-Ti陶瓷基復(fù)合材料，采用X射線衍射與掃描電鏡分析材料的物相組成和顯微結(jié)構(gòu)，研究燒結(jié)工藝對材料物相組成、顯微結(jié)構(gòu)和力學(xué)性能的影響。結(jié)果表明：Ni和Ti的添加顯著提高復(fù)合材料的強(qiáng)度和韌性；溫度小于1 600 ℃時，復(fù)合材料的力學(xué)性能隨熱壓溫度的升高而升高；溫度高于1 600 ℃時，溫度升高及保溫時間延長不僅會導(dǎo)致Al2O3晶粒的異常長大和Ti(C,N)的分解，而且會使Ni發(fā)生聚集現(xiàn)象，復(fù)合材料的力學(xué)性能下降；當(dāng)燒結(jié)溫度為1 600 ℃、保溫時間為30 min時，制備的Al2O3/Ti(C,N)-Ni-Ti陶瓷復(fù)合材料的力學(xué)性能最佳，其相對密度達(dá)到99.4%，抗彎強(qiáng)度為820 MPa，斷裂韌性達(dá)到9.3 MPa·m1/2。
關(guān)鍵字: 陶瓷復(fù)合材料；氧化鋁；碳氮化鈦；熱壓燒結(jié)；力學(xué)性能
（Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China）
Abstract:Al2O3/Ti(C, N)-Ni-Ti composites were fabricated by vacuum hot pressing. The microstructures of the materials were characterized by XRD and SEM, and the effects of sintering temperature and holding time on the phase components, microstructure and mechanical properties were investigated. The results indicate that the addition of Ni and Ti can significantly increase the strength and toughness of the composites. The mechanical properties of the composites improve with increasing hot pressing temperature while the temperature is lower than 1 600 ℃. When the hot pressing temperature is above 1 600 ℃, the increase of temperature or excess extension of holding time will not only lead to the overgrowth of Al2O3 grains and the decomposition of Ti(C,N), but also promote the aggregation of the melted metallic Ni, which is detrimental to the mechanical properties. The Al2O3/Ti(C,N)-Ni-Ti composite sample sintered at 1 600 ℃ for 30 min achieves a relative density of 99.4%, a bending strength of 820 MPa and a fracture toughness of 9.3 MPa·m1/2.
Key words: cermet composites; alumina; titanium carbonitride; hot pressing; mechanical property
