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Fabrication and properties of eordierite-mullite bonded porous SiC ceramics

机译：堇青石-莫来石键合多孔SiC陶瓷的制备与性能

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摘要

Codieritc-mullite bonded porous SiC ceramics were prepared by an in situ reaction bonding technique using a silicon carbide, aluminum hydroxide, MgO, and graphite as starting materials. The starting materials were mixed in different ratios and heated at different temperatures (1300-1450 °C) to obtain good mechanical properties. The pores in the ceramics were formed by burning graphite and by stacking particles of SiC and Al(OH)_3. The surface of SiC was oxidized to SiO_2 at high temperature, and fine Al_2O_3 grains produced by the decomposition of aluminum hydroxide. With further increasing the temperature, SiO_2 reacted with Al(OH)_3 and MgO to form eordierite-mullite. SiC particles were bonded by the oxidation-derived SiO_2 and eordierite-mullite. The reaction bonding behavior, phase composition, open porosity, microstructure and mechanical strength as well as pore size distribution of porous SiC ceramics were investigated. The results show that when 4.5 wt% MgO was added, in the absence of graphite, the flexural strength and the open porosity of the porous SiC ceramics were 78.71 MPa and 21.63%, respectively. In addition, when 30% graphite was added to the above composition, a flexural strength of 41.29 MPa was achieved at an open porosity of 42.11%.
机译：通过原位反应结合技术，使用碳化硅，氢氧化铝，MgO和石墨作为起始材料，制备了共铝莫来石结合的多孔SiC陶瓷。将原料以不同的比例混合并在不同的温度（1300-1450°C）下加热以获得良好的机械性能。陶瓷中的孔是通过燃烧石墨并堆积SiC和Al（OH）_3的颗粒而形成的。 SiC的表面在高温下被氧化为SiO_2，氢氧化铝的分解产生了细小的Al_2O_3晶粒。随着温度的进一步升高，SiO_2与Al（OH）_3和MgO反应形成堇青石-莫来石。 SiC颗粒通过氧化SiO_2和堇青石莫来石键合。研究了多孔SiC陶瓷的反应结合行为，相组成，开孔率，微观结构和机械强度以及孔径分布。结果表明，当添加4.5 wt％的MgO时，在不存在石墨的情况下，多孔SiC陶瓷的弯曲强度和开孔率分别为78.71 MPa和21.63％。另外，当将30％的石墨添加到上述组合物中时，在42.11％的开孔率下获得了41.29MPa的弯曲强度。

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