烧结工艺对纳米晶种微晶陶瓷刚玉磨料结构与性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (6): 2182-2189.

所属专题：陶瓷

烧结工艺对纳米晶种微晶陶瓷刚玉磨料结构与性能的影响

李海涛¹, 樊利存², 程浩艳¹, 石铁拴², 赵刚强², 胡浩¹

1.河南科技大学材料科学与工程学院,洛阳 471023;
2.河南东风新研材科技有限公司,洛阳 471023

收稿日期:2023-04-18 修订日期:2023-04-18 出版日期:2023-06-15 发布日期:2023-06-25
作者简介:李海涛(1973—),男,博士,副教授。主要从事微晶陶瓷刚玉磨料和无铅压电陶瓷方面的研究。E-mail:listone@163.com
基金资助:
河南省重点科技攻关项目(212102210581);河南省产学研合作项目(162107000029)

Effect of Sintering Process on Structure and Properties of Microcrystalline Ceramic Corundum Abrasive with Nano-Seed

1. School of Materials Science & Engineering, Henan University of Science and Technology, Luoyang 471023, China;
2. Henan Dongfeng Materials Innovation Research Technology Co., Ltd, Luoyang 471023, China

Received:2023-04-18 Revised:2023-04-18 Online:2023-06-15 Published:2023-06-25

摘要/Abstract

摘要： 采用溶胶-凝胶技术合成Al₂O₃刚玉前驱体,以SiO₂-MgO-CaO为助烧剂,α-Al₂O₃纳米粉体为晶种,利用传统烧结技术制备微晶陶瓷刚玉(SG)磨料。借助透射电镜(TEM)、X射线衍射(XRD)及热重-量热扫描(TG-DSC)等技术分析了晶种的特性和凝胶前驱体的热学性能,探讨了烧结温度和烧结时间对SG磨料微观结构和力学性能的影响。结果表明,纳米α-Al₂O₃晶种的添加使θ-Al₂O₃→α-Al₂O₃相变温度降低了250 ℃。单颗粒抗压强度和密度随烧结温度的升高和烧结时间的延长先增大后减小,晶粒形貌由等轴晶转变为片状晶。在1 320 ℃烧结45 min制备的SG磨料的单颗粒抗压强度和密度分别为40.2 N和3.88 g/cm³,平均晶粒粒径为0.56 μm,优于用传统烧结技术制备的微米晶种磨料样品。

关键词: 溶胶-凝胶, 微晶陶瓷, Al₂O₃刚玉磨料, 单颗粒抗压强度, 助烧剂, 晶种

Abstract: Al₂O₃ corundum precursor was synthesized by sol-gel technology, and microcrystalline ceramic corundum (SG) abrasive was prepared by traditional sintering technology with SiO₂-MgO-CaO as sintering aids and α-Al₂O₃ nano-powder as crystal seed. The characteristics of seed and thermal properties of gel precursor were analyzed by means of transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric-calorimetric scanning (TG-DSC). The effects of sintering temperature and holding time on microstructure and mechanical properties of SG abrasive were studied. The results show that α-Al₂O₃ nano-seed makes the transition temperature of θ-Al₂O₃→α-Al₂O₃ decrease by 250 ℃. With increasing sintering temperature and holding time, the single particle compressive strength and density increase first and then decrease, and the grain morphology changes from equiaxed crystal to platelike crystal. Sintering at 1 320 ℃ for 45 min, the single particle compressive strength and density of SG abrasives reach 40.2 N and 3.88 g/cm³, respectively, and the average particle size is 0.56 μm, which is superior to micron seed abrasive samples prepared by traditional sintering technology.

Key words: sol-gel, microcrystalline ceramic, Al₂O₃ corundum abrasive, single particle compressive strength, sintering aid, crystal seed

中图分类号:

TG316

李海涛, 樊利存, 程浩艳, 石铁拴, 赵刚强, 胡浩. 烧结工艺对纳米晶种微晶陶瓷刚玉磨料结构与性能的影响[J]. 硅酸盐通报, 2023, 42(6): 2182-2189.

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烧结工艺对纳米晶种微晶陶瓷刚玉磨料结构与性能的影响

Effect of Sintering Process on Structure and Properties of Microcrystalline Ceramic Corundum Abrasive with Nano-Seed

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