微米γ-Al_2O_3高压相变制备亚微米α-Al_2O_3  

Fabrication of submicron α-Al_2O_3 by the transformation of microcrystalline γ-Al_2O_3 under high-pressure

作　　者：仝斐斐 王海阔[1,2] 董丙舜 侯志强 杨亚楠[1,2] 谌云鹏 TONG Feifei;WANG Haikuo;DONG Bingshun;HOU Zhiqiang;YANG Yanan;SHEN Yunpeng(School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450001,China;Institute of Materials Pressing Treatment, Henan University of Technology, Zhengzhou 450001,China)

机构地区：[1]河南工业大学材料科学与工程学院,郑州450001 [2]河南工业大学材料压处理研究所,郑州450001

出　　处：《金刚石与磨料磨具工程》2019年第2期32-36,共5页Diamond & Abrasives Engineering

基　　金：国家自然科学基金青年科学基金(11504087;11804307);郑州市科技重大专项(174PZDZX567)

摘　　要：采用微米γ-Al_2O_3为原料,利用国产铰链式六面顶压机,在5 GPa压强下,经不同的温度和保温时间,实现了由γ-Al_2O_3向α-Al_2O_3的相转变。X射线衍射分析结果表明,得到的粉体和块体材料中均仅含α-Al_2O_3单相;扫描电镜结果显示合成的α-Al_2O_3最小晶粒尺寸为80 nm。在5 GPa压强、800℃条件下合成的样品平均晶粒尺寸为340 nm,实现了用微米γ-Al_2O_3高压相变制备亚微米α-Al_2O_3。与常压烧结方法相比,采用高温高压烧结,可在600℃实现γ-Al_2O_3向α-Al_2O_3的转变,显著降低α-Al_2O_3材料的合成温度。Microcrystalline γ-Al2O3 is used as raw material to prepare α-Al2O3 from γ-Al2O3 using the hinge-type cubic press under the pressure of 5 GPa with different temperatures. The results of X-ray diffraction analysis show that the obtained powders and bulk materials are pure α-Al2O3 phase. The scanning electron microscope analysis shows that the minimum grain size of the α-Al2O3 is about 80 nm and the average grain size of the α-Al2O3 synthesized under the pressure of 5 GPa and the temperature of 800 ℃ is 340 nm. Experimental results show that the submicron α-Al2O3 is fabricated by high pressure phase transformation of microncrystalline γ-Al2O3 . Compared with the normal pressure sintering method, the complete phase transformation from γ-Al2O3 to α-Al2O3 can be achieved at 600 ℃ by high pressure sintering, which obviously reduces the synthesis temperature of α-Al2O3 materials.

关 键 词：高温高压 Γ-AL2O3 Α-AL2O3 磨料 

分 类 号：TQ163[化学工程—高温制品工业] TB321[一般工业技术—材料科学与工程]