Xin Li, Jian Tang, Jia Qiao, Bin Chen, Hongfang Shen
{"title":"TiB2 亚微米粉末在空气中的氧化机理和动力学","authors":"Xin Li, Jian Tang, Jia Qiao, Bin Chen, Hongfang Shen","doi":"10.1111/jace.20135","DOIUrl":null,"url":null,"abstract":"<p>High-activity TiB<sub>2</sub> submicron powders were synthesized via microwave-assisted carbothermal reduction, and their oxidation behavior at 550°C–1000°C for 0.5–1.5 h in air atmosphere was carried out by the isothermal oxidation test. The phase composition and microstructure evolution of the oxidation products were performed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). It was established that TiB<sub>2</sub> submicron powders had been significantly oxidized at 550°C, and the oxidation products were TiO<sub>2</sub> and B<sub>2</sub>O<sub>3</sub>. Hexagonal plate-like TiB<sub>2</sub> grains had been completely disappeared, and fragmented into uniform nano-scale spherical TiO<sub>2</sub> particles after being oxidized at 1000°C for 1 h, accompanied by the violent evaporation of B<sub>2</sub>O<sub>3</sub> products at temperatures above 1000°C. In addition, the corresponding oxidation kinetics was investigated by using a non-isothermal thermogravimetric (TG)–differential scanning calorimetry (DSC) technique. The results showed that the Mample power law (<i>n</i> = 1) was the most probable mechanism function, and the oxidation activation energy <i>E</i> of TiB<sub>2</sub> submicron powders was 640.58 kJ/mol.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 1","pages":""},"PeriodicalIF":3.5000,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Oxidation mechanism and kinetics of TiB2 submicron powders in air\",\"authors\":\"Xin Li, Jian Tang, Jia Qiao, Bin Chen, Hongfang Shen\",\"doi\":\"10.1111/jace.20135\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>High-activity TiB<sub>2</sub> submicron powders were synthesized via microwave-assisted carbothermal reduction, and their oxidation behavior at 550°C–1000°C for 0.5–1.5 h in air atmosphere was carried out by the isothermal oxidation test. The phase composition and microstructure evolution of the oxidation products were performed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). It was established that TiB<sub>2</sub> submicron powders had been significantly oxidized at 550°C, and the oxidation products were TiO<sub>2</sub> and B<sub>2</sub>O<sub>3</sub>. Hexagonal plate-like TiB<sub>2</sub> grains had been completely disappeared, and fragmented into uniform nano-scale spherical TiO<sub>2</sub> particles after being oxidized at 1000°C for 1 h, accompanied by the violent evaporation of B<sub>2</sub>O<sub>3</sub> products at temperatures above 1000°C. In addition, the corresponding oxidation kinetics was investigated by using a non-isothermal thermogravimetric (TG)–differential scanning calorimetry (DSC) technique. The results showed that the Mample power law (<i>n</i> = 1) was the most probable mechanism function, and the oxidation activation energy <i>E</i> of TiB<sub>2</sub> submicron powders was 640.58 kJ/mol.</p>\",\"PeriodicalId\":200,\"journal\":{\"name\":\"Journal of the American Ceramic Society\",\"volume\":\"108 1\",\"pages\":\"\"},\"PeriodicalIF\":3.5000,\"publicationDate\":\"2024-09-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of the American Ceramic Society\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1111/jace.20135\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, CERAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/jace.20135","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
Oxidation mechanism and kinetics of TiB2 submicron powders in air
High-activity TiB2 submicron powders were synthesized via microwave-assisted carbothermal reduction, and their oxidation behavior at 550°C–1000°C for 0.5–1.5 h in air atmosphere was carried out by the isothermal oxidation test. The phase composition and microstructure evolution of the oxidation products were performed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). It was established that TiB2 submicron powders had been significantly oxidized at 550°C, and the oxidation products were TiO2 and B2O3. Hexagonal plate-like TiB2 grains had been completely disappeared, and fragmented into uniform nano-scale spherical TiO2 particles after being oxidized at 1000°C for 1 h, accompanied by the violent evaporation of B2O3 products at temperatures above 1000°C. In addition, the corresponding oxidation kinetics was investigated by using a non-isothermal thermogravimetric (TG)–differential scanning calorimetry (DSC) technique. The results showed that the Mample power law (n = 1) was the most probable mechanism function, and the oxidation activation energy E of TiB2 submicron powders was 640.58 kJ/mol.
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The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials.
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