A new arrangement of SiC particles in reaction bonded Si3N4-SiC ceramic refractory and crack behaviors under thermal shock

2017 ◽  
Vol 43 (17) ◽  
pp. 15034-15039 ◽  
Author(s):  
Shuowei Yuan ◽  
Zichun Yang ◽  
Shuang Zhao
Keyword(s):  
Thermal Shock ◽  
Sic Particles ◽  
Sic Ceramic ◽  
Ceramic Refractory

Evaluations of cooling rate and initial temperature on thermal shock behavior of ZrB2-SiC ceramic

2018 ◽  
Vol 741 ◽  
pp. 509-513 ◽  
Author(s):  
Anzhe Wang ◽  
Ping Hu ◽  
Cheng Fang ◽  
Dongyang Zhang ◽  
Xinghong Zhang
Keyword(s):  
Thermal Shock ◽  
Cooling Rate ◽  
Initial Temperature ◽  
Sic Ceramic ◽  
Thermal Shock Behavior

Sic Based Ceramic Foams Reinforced by In Situ Mullite Whisker

2009 ◽  
Vol 79-82 ◽  
pp. 1983-1986 ◽  
Author(s):  
Xiao Li Ji ◽  
Fei Xu ◽  
Hai Ya Chen
Keyword(s):  
Compressive Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Ceramic Foams ◽  
Sic Ceramic ◽  
Influence Of Temperature On ◽  
Shock Resistance ◽  
Mullite Whiskers ◽  
Maximum Compressive Strength

Prepared silicon carbide(SiC) ceramic foams combined with mullite whiskers which synthesized by in-situ reaction. Studied on the influence of temperature on the synthesis of mullite whisker, and the influence of mullite content on the compressive strength, thermal shock resistance of SiC ceramic foams. The results indicate that the performance of mullite whiskers synthesized at 1400°Cwere best, when mullite content was 25%, SiC ceramic foams could reach the maximum compressive strength for 1.75MP, the most thermal shock resistance for14 times.

Thermal Shock Resistance of Laminated ZrB2 -SiC Ceramic Evaluated by Indentation Technique

2015 ◽  
Vol 98 (9) ◽  
pp. 2866-2872 ◽  
Author(s):  
Peng Zhou ◽  
Zhi Wang ◽  
Youhua Fan ◽  
Ping Hu ◽  
Xinghong Zhang ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Indentation Technique ◽  
Sic Ceramic ◽  
Shock Resistance

Fabrication, Microstructure, and Properties of Zirconium Diboride Matrix Ceramic

2013 ◽  
pp. 354-412 ◽  
Author(s):  
Zhi Wang ◽  
Zhanjun Wu
Keyword(s):  
Thermal Stress ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Zirconium Diboride ◽  
Isothermal Oxidation ◽  
Rate Of Change ◽  
Oxide Layers ◽  
Sic Ceramic ◽  
Shock Resistance ◽  
Quenching Method

The crystal structure, synthesis, and densification of zirconium diboride (ZrB2) are summarized in detail. In this chapter, ZrB2-ZrC-SiC ceramic was synthesized by reactive hot pressing a mixture of Zr, B4C, and Si powders. The thermal shock resistance of the ZrB2-SiC-ZrC ceramic was estimated by the water-quenching method and was significantly greater than that of a ZrB2-15vol.% SiC ceramic. The isothermal oxidation of the ZrB2-SiC-ZrC ceramic was carried out in static air at constant temperatures of 1000±15, 1200±15, and 1400±15 ºC for different amounts of time at each temperature. The mechanism of strength increase for the oxidized specimen indicated that the strength increased with the reaction rate, which was related to the rate of change in volume induced by reaction, initial crack geometry, elastic modulus, and surface free energy. The formation of oxide layers resulted in (I) repair of surface flaws, (II) increase in flexural strength, (III) appearance of a compressive stress zone beneath the surface oxide layers, (IV) decrease in thermal stress, and (V) consumption of thermal stress. These five aspects were favorable to the improvement of the thermal shock resistance of the ZrB2-SiC-ZrC ceramic. The isothermal oxidation of the ZrB2-SiC-ZrC ceramic was carried out in static air at 1600±15 ºC. In the different oxidation stages, quantitative models were proposed for predicting oxidation kinetics.

scholarly journals Crucial effect of SiC particles on in situ synthesized mullite whisker reinforced Al2O3-SiC composite during microwave sintering

2017 ◽  
Vol 11 (2) ◽  
pp. 106-112 ◽  
Author(s):  
Xudan Dang ◽  
Meng Wei ◽  
Rui Zhang ◽  
Keke Guan ◽  
Bingbing Fan ◽  
...  
Keyword(s):  
Particle Size ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Hot Spot ◽  
Microwave Sintering ◽  
Sic Particles ◽  
Shock Resistance ◽  
Sic Particle

Mullite whisker reinforced Al2O3-SiC composites were in situ synthesized by microwave sintering at 1500?C for 30min. The influence of SiC particle size on heating process and properties of Al2O3-SiC composite were investigated. The XRD and SEM techniques were carried out to characterize the samples. The thermal shock resistance and flexural strength of the samples were examined through water quenching and three-point bending methods, respectively. It was found that the bridging of mullite whisker appeared between Al2O3 and SiC particles which enhanced the thermal shock resistance. A so-called local hot spot effect was proposed dependent on the coupling of SiC particles with microwave, which was the unique feature of microwave sintering. The maximal thermal shock resistance and flexural strength were obtained for the samples with SiC particle size of ~5?m.

Preparation and High Temperature Performance of β-Sialon Bonded Corundum Multiphase Material

2007 ◽  
Vol 336-338 ◽  
pp. 1498-1500 ◽  
Author(s):  
Wan Mei Sui ◽  
Shi Jun Luan ◽  
Ran Ran Song
Keyword(s):  
High Temperature ◽  
Thermal Shock ◽  
Carbothermal Reduction ◽  
Thermal Shock Resistance ◽  
Reaction Kinetic ◽  
Particle Phase ◽  
Temperature Oxidation ◽  
Brittle Rupture ◽  
Shock Resistance ◽  
Ceramic Refractory

β-Sialon bonded corundum multiphase ceramic refractory was prepared by the method of carbothermal reduction and nitridation reactions of clay mineral doped with corundum particle phase. The high-temperature oxidation resistance and the thermal-shock resistance behaviors of the material were tested and investigated. The results show that the oxidation reaction history at 1573K can be divided into two reaction kinetic phases. The circle times of the thermal-shock resistance ($=1473K) reached to more than 200 times and the thermal shock failure is not a brittle rupture but a desquamate damage.

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