Microstructure and mechanical property of in-situ synthesized SiC–TiB2 porous ceramic as a function of TiB2 content

• Published in: Ceramics international Vol. 48; no. 19; pp. 27605 - 27614
• Main Authors: Zhang, X., Ru, H.Q.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2022
• Subjects: In-situ synthesis; Mechanical properties; Porous structure characteristics; SiC-TiB2 porous ceramics; Strength-pore structure relationship; Mechanical properties; Strength-pore structure relationship; SiC-TiB2 porous ceramics; In-situ synthesis; Porous structure characteristics
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2022.06.056

A convenient and promising one-step manufacturing processes was successfully developed to fabricate SiC–TiB2 porous ceramics. TiO2, B4C and sucrose were used as raw materials for in-situ generation of TiB2 phase, which promoted skeleton grain bonding and achieved highly interconnected pores simultaneously. The effect of different TiB2 volume fractions on porous structures, pore parameters, and mechanical properties was studied. SiC–TiB2 porous ceramics were obtained with porosities ranging from 36.2% to 41.9%, pore sizes ranging from 2 μm to 10 μm, and high compressive strength up to 169.5 MPa. Apart from the total porosity, TiB2 content, as well as pore/skeleton characteristics, were demonstrated as important factors affecting the mechanical properties. Hence, based on the strength-porosity relationship, an extended equation was proposed for modelling and optimizing the mechanical properties of biphasic porous ceramics.