1400℃下SiC-SiO2-TiC-TiO2-CaO和SiC-CaO-TiO2边界体系的固相反应和相关系

IF 0.6 4区 材料科学 Q3 MATERIALS SCIENCE, CERAMICS
W. Z. Sun, Z. K. Huang, Y. J. Lu, L. M. Liu, X. P. Zhang
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引用次数: 0

摘要

众所周知,TiC可以在SiC-TiO2-CaO体系中通过固相反应形成。要利用该反应合成TiC基陶瓷或SiC/TiC多相陶瓷,首先需要研究反应体系内的高温物化反应和相平衡关系,为配方优化和工艺指导提供依据。因此,通过实验和热力学计算,研究了1400℃时SiC-SiO2-TiC-TiO2-CaO体系及其边界SiC-TiO2-CaO体系的固相反应和相平衡关系。结果表明,该体系经历了多次高温物理化学反应。首先,TiO2与SiC发生置换反应生成TiC: TiO2 + SiC = TiC + SiO2。然后,SiO2立即与CaO反应,生成CaSiO3、Ca3Si2O7、Ca2SiO4或Ca3SiO5等硅酸钙。同时,过量的TiO2与CaO反应生成钛酸钙,如CaTiO3、Ca3Ti2O7或CaTiSiO5。实验证实了TiC与盐类化合物在氧化物SiO2-TiO2-CaO体系中的平衡关系,除CaTiSiO5外,由于样品中TiO2的还原,没有得到CaTiSiO5,从而形成Ca3Ti2Si3O12和Ti2O3。在仔细研究了SiC - sio2 - cao三元体系中的相关系后,最终证明了SiC与所有硅酸钙盐平衡共存。成功地确定了体系内的二元、三元和四元相关系,并在此基础上建立了SiC-SiO2-TiC-TiO2-CaO体系相关系的初步方案。有7个含tic的四相区和6个含SiC/ tic的四相区。这些工作对复合陶瓷和复合材料的设计具有一定的指导意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Solid-State Reactions and Phase Relationships in the Quinary SiC–SiO2–TiC–TiO2–CaO and Boundary SiC–CaO–TiO2 Systems at 1400°C

Solid-State Reactions and Phase Relationships in the Quinary SiC–SiO2–TiC–TiO2–CaO and Boundary SiC–CaO–TiO2 Systems at 1400°C

It is known that TiC can be formed as a result of solid-phase reactions in SiC–TiO2–CaO systems. To synthesize TiC-based ceramics or SiC/TiC multiphase ceramics using this reaction, it is first necessary to research the high-temperature physicochemical reactions and phase equilibrium relationships within the reaction system, which will serve as the basis for formulation optimization and process guidance. Therefore, solid-state reactions and phase equilibrium relations in the quinary SiC–SiO2–TiC–TiO2–CaO system and its boundary SiC–TiO2–CaO system at 1400°C were investigated through experiments and thermodynamic calculations. The results suggest that the system undergoes numerous high-temperature physicochemical reactions. First, TiO2 reacted with SiC to form TiC through a displacement reaction: TiO2 + SiC = TiC + SiO2. Then, SiO2 immediately reacted with CaO, forming calcium silicates such as CaSiO3, Ca3Si2O7, Ca2SiO4, or Ca3SiO5. At the same time, excess TiO2 and CaO react to form calcium titanates, such as CaTiO3, Ca3Ti2O7, or CaTiSiO5. Experiments confirmed the equilibrium relations of TiC with salt-like compounds in the oxide SiO2–TiO2–CaO system, except for CaTiSiO5, which was not obtained due to the reduction of TiO2 in the samples, resulting in the formation of Ca3Ti2Si3O12 and Ti2O3. Upon meticulous examination of the phase relationships within the SiC–SiO2–CaO ternary system, it has been conclusively demonstrated that SiC coexists in equilibrium with all calcium silicate salts. The binary, ternary, and quaternary phase relationships within the system were successfully determined, and based on this, a tentative scheme of phase relationships in the SiC–SiO2–TiC–TiO2–CaO system was established. There are seven TiC-containing four-phase regions and six SiC/TiC-containing four-phase regions. These works would benefit compositionally designing MC ceramic and MC/SiC composites.

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来源期刊
Powder Metallurgy and Metal Ceramics
Powder Metallurgy and Metal Ceramics 工程技术-材料科学:硅酸盐
CiteScore
1.90
自引率
20.00%
发文量
43
审稿时长
6-12 weeks
期刊介绍: Powder Metallurgy and Metal Ceramics covers topics of the theory, manufacturing technology, and properties of powder; technology of forming processes; the technology of sintering, heat treatment, and thermo-chemical treatment; properties of sintered materials; and testing methods.
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