Effects of Si3N4 and WC on the oxidation resistance of ZrB2/SiC ceramic tool materials |
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| Affiliation: | 1. School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China;2. Key Laboratory of Equipments Manufacturing and Intelligent Measurement and Control, China National Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China;3. Shandong Institute of Machanical Design and Research, Jinan, 250031, China;4. Jinan Xinlixin Machinery Building Co., Jinan, 250022, China |
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| Abstract: | ZrB2/SiC, ZrB2/SiC/Si3N4 and ZrB2/SiC/WC ceramic tool materials were prepared by spark plasma sintering technology, and their oxidation resistance was tested at different oxidation temperatures. When the oxidation temperature is 1300 °C, the oxide layer thickness, oxidation weight gain and flexural strength of ZrB2/SiC/Si3N4 ceramic tool material after oxidation are 8.476 μm, 1.436 mg cm?2 and 891.0 MPa, respectively. Compared with ZrB2/SiC ceramic tool materials, the oxide layer thickness and oxidation weight gain are reduced by 8.2% and 11.8%, respectively, and the flexural strength after oxidation is increased by 116.1%. However, the addition of WC significantly reduces the oxidation resistance of the ceramic tool material. A dense oxide film is formed on the surface of ZrB2/SiC/Si3N4 ceramic tool material during oxidation, which effectively prevents oxygen from entering the inside of the material, thereby improving the oxidation resistance of the ceramic tool material. |
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| Keywords: | Ceramic tool materials Spark plasma sintering Oxidation resistance Oxide layer |
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