Low-temperature fabrication of porous SiC ceramics by preceramic polymer reaction bonding

Zhu, Shujia; Ding, Shuqiang; Xi, Hong-An; Wang, Ruoding

doi:10.1016/j.matlet.2004.11.003

Cited by 116 publications

(54 citation statements)

References 13 publications

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“…Now a day researcher has been focused on the low-temperature processing of porous SiC using various sintering agents. Low-temperature processing of porous SiC have been successively prepared by using pre-ceramic polymer such as polycarbosilane as precursor for the SiC and while sintering at 1000-1100°C, organic to inorganic transformation was occurred and that SiC act as bonding phase between starting SiC particles [12,13]. Addition or the incorporation of secondary phases or the use of sintering aids as bonding material is an effective method to lower the processing temperature of porous SiC.…”

Section: Introductionmentioning

confidence: 99%

Processing of silica bonded porous SiC preform for metallic composites

et al. 2015

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Porous SiC ceramics were successfully fabricated by silica bonding of SiC compacts and porogen burnout technique. Silica coating on SiC particle was carried out using TEOS hydrolysis and crystallizes during the sintering process at 1200°C, which forms a well-developed neck growth between the SiC particles. Different volume fractions of sodium chloride porogen were used to obtain varied porosity content in porous SiC ceramics from 36 to 62.47 % leading to wide-ranging compressive strength from 8.11 to 0.69 MPa. Interconnected bimodal pores were created throughout the sample due to the burnt out of salt and stacking of SiC particles. The pore size distribution of porous SiC measured using mercury intrusion porosimetry shows that average pore size due to the salt particle is around 74-110 lm and stacking of SiC particle result 4-10 lm. Direct squeeze infiltration method is successfully adopted for infiltration of 6061 aluminium molten alloy into SiC preforms with the controlled process parameters of initial preform temperature, liquid metal superheating, squeezed pressure and its rate of application and die temperature. Microstructures have shown complete infiltration of Al alloy into the pores of the SiC preform forming Al composite with good interfacial bonding aided by the presence of MgAl 2 O 4 spinel. The silica coating on SiC surface have a multifunctional role of acting as a binder for the porous preform, enhances the wettability of SiC particle with molten metal during infiltration and prevention of deleterious Al 4 C 3 interfacial reaction product.

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Section: Introductionmentioning

confidence: 99%

Processing of silica bonded porous SiC preform for metallic composites

et al. 2015

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“…• C) [38][39][40][41][42], excellent mechanical strength [43][44][45] despite the amorphous phase, excellent thermal shock resistance [46], good thermochemical stability [47,48], and excellent creep resistance, better than that of vitreous silica [27]. Accordingly, extensive research has been carried out to fabricate a wide range of porous ceramic structures from polysiloxane precursors by employing various processing methods.…”

Section: Introductionmentioning

confidence: 99%

Processing of polysiloxane-derived porous ceramics: a review

Kumar

Kim

2010

Science and Technology of Advanced Materials

112

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Because of the unique combination of their attractive properties, porous ceramics are considered as candidate materials for several engineering applications. The production of porous ceramics from polysiloxane precursors offers advantages in terms of simple processing methodology, low processing cost, and easy control over porosity and other properties of the resultant ceramics. Therefore, considerable research has been conducted to produce various Si(O)C-based ceramics from polysiloxane precursors by employing different processing strategies. The complete potential of these materials can only be achieved when properties are tailored for a specific application, whereas the control over these properties is highly dependent on the processing route. This review deals with processing strategies of polysiloxane-derived porous ceramics. The essential features of processing strategies-replica, sacrificial template, direct foaming and reaction techniques-are explained and the available literature reports are thoroughly reviewed with particular regard to the critical issues that affect pore characteristics. A short note on the cross-linking methods of polysiloxanes is also provided. The potential of each processing strategy on porosity and strength of the resultant SiC or SiOC ceramics is outlined.

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“…Among them, SiC possesses many passivating characters and unique properties, such as high strength, high modulus, and high temperature resistance [4,5]. Additionally, it is well known that ZrC has relatively low density, high melting temperature, great hardness, and excellent mechanical stability, and is an ideal anti-ablative material [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and ceramization of a SiC–ZrC–C preceramic polymer precursor

Liu

et al. 2015

J Mater Sci

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A silicon-and zirconium-containing polymer precursor (PSZC) for SiC-ZrC-C ceramic was successfully synthesized by chemical reaction of phenol, paraformaldehyde, tetraethoxysilane, acetylacetone, and ZrOCl 2 Á 8H 2 O. The chemical structure, pyrolysis behaviors, and pyrolysis products of PSZC were characterized by the combination of FT-IR, 1 H-NMR, TG-DTG, XRD, Raman, SEM, and EDS. It indicates that the obtained PSZC might be Zr-O-Zr and Si-O-Si chain polymer connected by Si-O-Zr bond with hydroxymethyl phenol and acetylacetone as ligands. And the most probable reaction mechanism to form PSZC was proposed. Decomposition of PSZC is completed at 800°C, and it gives amorphous carbon, SiO 2 , and ZrO 2 with a yield of 70 %. During heat treatment, SiC forms at about 1500°C, followed by the appearance of ZrC. Defects of the carbon are cumulated to the highest at 1500°C. Further heating at 1800°C induces highly crystallized ZrC, SiC ceramic, and structure-ordered carbon with a structure of ZrC and SiC particles uniformly distributed in the carbon matrix.

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Low-temperature fabrication of porous SiC ceramics by preceramic polymer reaction bonding

Cited by 116 publications

References 13 publications

Processing of silica bonded porous SiC preform for metallic composites

Processing of silica bonded porous SiC preform for metallic composites

Processing of polysiloxane-derived porous ceramics: a review

Synthesis, characterization, and ceramization of a SiC–ZrC–C preceramic polymer precursor

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