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Synthesis and two-step sintering behavior of sol–gel derived nanocrystalline corundum abrasives |
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| Authors: | Zicheng Li Zhihong Li Aiju Zhang Yumei Zhu |
| Affiliation: | 1. Institute of Processing and Application of Inorganic Materials, (PAIM), Hanseo University # 360, Seosan-si, Chungnam 356-706, Republic of Korea;2. Institute of Ceramics, Glass and Construction Materials, Freiberg University, Agricolastrasse 17, 09599 Freiberg, Germany;1. Department of Chemistry, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China;2. School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China |
| Abstract: | Nanocrystalline corundum abrasive with mean crystal size of less than 100 nm was synthesized by two-step sintering method using sol–gel process. A remarkable suppression of grain growth was achieved by controlling sintering temperature and taking advantage of sintering aids during the final stage of a two-step sintering process. The grain size of the high densification samples (>99% theoretical density) produced by two-step sintering method was about 10 times less than the samples made by the conventional sintering technique. The microstructure of the samples was homogeneous without abnormal grain growth and the sol–gel derived corundum abrasive with two-step sintering technique exhibited excellent mechanical properties and wear resistance compared to those sol–gel derived corundum abrasive with conventional sintering methods and fused corundum abrasive. |
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