Influence of MgO addition on mechanical and ablation characteristics of ZrB2–SiC composites developed through microwave sintering

Zirconium Diboride (ZrB2) is known as an ultra-high temperature ceramic with applications in various industries like refractory and foundry industries. In conjunction with Silicon Carbide (SiC), ZrB2 ceramic finds extensive applications in the nose caps and leading edges of atmospheric re-entry vehicles and rocket propulsion. The primary objective is to optimize the output responses viz., Vickers micro hardness, relative density, compressive strength of ZrB2-30 vol.% SiC composites developed through microwave sintering. The three control factors viz., sintering temperature, heating rate and holding time are chosen as input process parameters for microwave sintering. Taguchi’s L9 orthogonal array is used to obtain experimental runs. The Grey Relational Taguchi provides the optimal process parameters by binding the multiple responses (relative density, vickers micro-hardness, and compressive strength) into single comprehensive response [i.e., Grey Relational Grade (GRG)]. The results confirm that the optimal parameters attained using Grey Relational Taguchi maximize the performance characteristics of the microwave sintering process.

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Development and investigation of densification behavior of ZrB2–SiC composites through microwave sintering

Materials Research Express ◽

10.1088/2053-1591/ab3aca ◽

2019 ◽

Vol 6 (10) ◽

pp. 105072 ◽

Cited By ~ 1

Author(s):

Ankur Sharma ◽

D B Karunakar

Keyword(s):

Microwave Sintering ◽

Densification Behavior ◽

Sic Composites

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Celsian/yttrium silicate protective coating prepared by microwave sintering for C/SiC composites against oxidation

Materials Science and Engineering A ◽

10.1016/j.msea.2008.11.008 ◽

2009 ◽

Vol 505 (1-2) ◽

pp. 187-190 ◽

Cited By ~ 18

Author(s):

Xiaohui Zheng ◽

Yongguo Du ◽

Jiayu Xiao ◽

Yufeng Lu ◽

Chiyong Liang

Keyword(s):

Protective Coating ◽

Microwave Sintering ◽

Yttrium Silicate ◽

Sic Composites

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Study on Thermophysical Properties of Partially Oxidized Polymer Derived SiC Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.560-561.86 ◽

2012 ◽

Vol 560-561 ◽

pp. 86-90

Author(s):

Xiao Yi Han ◽

Hai Feng Cheng ◽

Xin Xing ◽

Jun Wang

Keyword(s):

Thermal Conductivity ◽

Thermal Diffusivity ◽

Thermophysical Properties ◽

Sintering Temperature ◽

Raw Materials ◽

Microwave Sintering ◽

Liquid Phase Sintering ◽

X Ray Diffraction ◽

Amorphous Si ◽

Sic Composites

SiC ceramics were synthesized by polymer derived method and microwave sintering processes. The as-produced SiC composites were developed by oxidizing the amorphous Si-C raw materials derived from a polymer precursor polycarbosilane. The products analyzed by X-ray diffraction (XRD), Fourier transmittance infrared spectroscopy (FTIR), and electronic microscopye consist of excess free carbon, β-SiC and SiO2 produced by the partial oxidation of amorphous Si-C on the surface of the starting particles. The thermophysical properties of the partially oxidized SiC composites were investigated by measuring the thermal diffusivity, the specific heat and thermal conductivity. The amount of SiO2 increased as the sintering temperature is increased, resulting in a reduction of thermal diffusivity and an increase of density due to improved liquid phase sintering of SiC particles. The thermal conductivity of samples decreased, instead of increased, as the sintering temperature was increased from 1100 °C to 1200 °C. The sample dwelled at 1200 °C, in this study, has highest density and a relatively low thermal conductivity, slightly over 0.7 W/(m·K) at room temperature.

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