Thermochemical Characterization of Fine Ceramic Powders
精细陶瓷粉末的热化学表征
基本信息
- 批准号:60470071
- 负责人:
- 金额:$ 4.03万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1985
- 资助国家:日本
- 起止时间:1985 至 1986
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Thermodynamic studies have been performed for the purpose of characterization of fine powders of ceramics such as <TiO_2> and ZnO.Theoretical analysis has been given for classical DTA, power-compensated DSC and heat-flux DSC, based on a unified model which is applicable to all the three types of instruments. The method of estimating the actual temperature was shown in the case of the first-order phase transition. A principle of drawing the base line was given for determining the enthalpy of transition. Theoretical peak height due to the transition was represented as a function of the heat capacity, the thermal resistance and the heating (cooling) rate.The sample of <TiO_2> powder was prepared by hydrolysis of titanium tetraisopropoxide. The size of the particles was 0.1 - 0.3 <micro> which was examined by scanning electron microscopy. The structure was identified by X-ray diffraction. The specific surface area was determined by nitrogen adsorption. The heat of immersion in water was measured by using a heat-flux type of calorimeter. The TG-DTA experiments of the sample showed reversible dehydration on heating and hydration on cooling below about 650 K, at which a sharp exothermic peak was observed due to crystallization from amorphous state to anatase. The measurements of specific surface area and heat of immersion were made on the samples treated at various temperatures. The properties of the surface of the particles were discussed.The samples of ZnO powders were prepared by thermal decomposition of zinc oxalate and by hydrolysis of zinc ethoxide. The process of decomposition and microstructure development of the resulting ZnO powders were examined. The physicochemical properties of the surface of the particles were also studied.
本文从热力学角度研究了ZnO等陶瓷细粉的表征<TiO_2>,对经典差热分析仪、功率补偿差热分析仪和热流差热分析仪进行了理论分析,建立了适用于这三种仪器的统一模型。在一级相变的情况下,给出了实际温度的估算方法。给出了确定相变焓的基线原则。理论峰高与热容、热阻和升温(降温)速率有关<TiO_2>。通过扫描电子显微镜检查,颗粒的尺寸为0.1 - 0.3<micro>。其结构经X射线衍射鉴定。通过氮吸附测定比表面积。使用热通量型热量计测量浸入水中的热量。热重-差热分析结果表明,在650 K以下,样品加热脱水和冷却水合是可逆的,在此温度下,样品从非晶态结晶到结晶态出现一个尖锐的放热峰。在不同温度下处理的样品上进行比表面积和浸没热的测量。采用草酸锌热分解法和乙醇锌水解法制备了氧化锌粉体,并对氧化锌粉体的表面性质进行了讨论。研究了所得ZnO粉末的分解过程和微观结构的发展。还研究了颗粒表面的物理化学性质。
项目成果
期刊论文数量(20)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Yasutoshi SAITO: "Thermochemical Characterization of Fine <TiO_2> Powder Prepared by Hydrolysis of Alkoxide"
Yasutoshi SAITO:“醇盐水解制备的细<TiO_2>粉末的热化学表征”
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Yasutoshi SAITO: "Theoretical Analysis of Peak Height in Classical DTA, Power-compensated DSC and Heat-flux DSC" Thermochimica Acta. 107. 277-282 (1986)
Yasutoshi SAITO:“经典 DTA、功率补偿 DSC 和热通量 DSC 峰高的理论分析”Thermochimica Acta。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Yasutoshi SAITO: Thermochimica Acta. 104. 275-283 (1986)
斋藤康稔:Thermochimica Acta。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Yasutoshi SAITO: Thermochimica Acta. 107. 277-282 (1986)
斋藤康稔:Thermochimica Acta。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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SAITO Yasutoshi其他文献
SAITO Yasutoshi的其他文献
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Research on the present situation and future development of external degree systems in the U.S.A.and U.K.
美国、英国外部学位制度现状及未来发展研究
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07451072 - 财政年份:1995
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Development of Heat Capacity Spectroscopy and Application to Relaxation Process in Amorphous Materials
热容光谱学的发展及其在非晶材料弛豫过程中的应用
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62850120 - 财政年份:1987
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Grant-in-Aid for Developmental Scientific Research
MECHANISM OF THE RARE EARTH EFFECT IN HIGH TEMPERATURE OXIDE SCALES FORMED ON HEAT-RESISTING ALLOYS
耐热合金高温氧化皮中稀土效应的机理
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62430014 - 财政年份:1987
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$ 4.03万 - 项目类别:
Grant-in-Aid for General Scientific Research (A)
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