摘要
采用纯纳米AlN粉和掺杂质量分数3%Y_(2)O_(3)的纳米AlN粉为原料,经放电等离子烧结工艺制备AlN陶瓷,研究了两类AlN陶瓷的相对密度、微观组织、力学性能和导热性能。结果表明:纯纳米AlN粉和掺杂Y_(2)O_(3)纳米AlN粉在40~60 MPa下,经1500℃放电等离子烧结5~60 min,均可获得相对密度>99%的AlN陶瓷。当烧结压力为50 MPa时,获得的AlN陶瓷晶粒尺寸最小,分别为176 nm和190 nm,细化晶粒明显提高了AlN陶瓷硬度和抗弯强度。当烧结时间从5 min延长至60 min时,两种AlN陶瓷晶粒尺寸分别增大至1.71μm和1.73μm。晶粒长大导致AlN陶瓷硬度和抗弯强度下降,但提升了导热性能。通过对比发现,相同放电等离子烧结工艺下添加烧结助剂Y_(2)O_(3)能够有效提升AlN陶瓷的综合性能。
AlN ceramics were prepared by spark plasma sintering(SPS)using the pure nano-AlN powders and the nano-AlN powders doped by 3%Y2O3(mass fraction)as the raw materials.The relative density,microstructure,mechanical properties,and thermal conductivity of two types of AlN ceramics were studied.The results show that,both the pure nano-AlN powders and the nano-AlN powders doped by Y_(2)O_(3) can obtain the AlN ceramics with the relative density above 99%prepared by SPS at 1500℃for 5~60 min under 40~60 MPa.When the sintering pressure is 50 MPa,the average grain size of the AlN ceramics is the smallest,which is 176 nm and 190 nm,respectively.The hardness and bending strength of the AlN ceramics are obviously improved by the grain refinement. When the sintering time is extended from 5 min to 60 min, the grain size of the AlN ceramics is increased to 1.71 μm and 1.73 μm, respectively. The grain growth leads to the decrease of hardness and bending strength of the AlN ceramics, but improves the thermal conductivity. It is found that the addition of Y_(2)O_(3) sintering agent can effectively improve the comprehensive properties of the AlN ceramics under the same SPS sintering process.
作者
赵东亮
何庆
朱在稳
尹海清
秦明礼
ZHAO Dongliang;HE Qing;ZHU Zaiwen;YIN Haiqing;QIN Mingli(Hebi Sinopack Electronic Technology Co.,Ltd.,Shijiazhuang 050200,China;Amoy Institute of Technovation,Xiamen 361001,China;Xiamen Juci Technology Co.,Ltd.,Xiamen 361100,China;Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing 100083,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China)
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2024年第1期29-35,共7页
Powder Metallurgy Technology
基金
河北省省级科技计划资助项目(20311001D)
