Effect of Sintering Temperature on the Strength of BN Ceramic
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Pure BN ceramic and B2O3 -BN ceramic composites have been sintered by hot pressing (HP) method. The mechanical properties of the two materials, such as flexural strength and modulus of elasticity were measured by three point bending techniques. Fractured surfaces of two materials were analyzed by SEM. The results showed that relative density and strength of pure BN ceramics was inferior when sintering temperature reached 1800C. The mechanical properties of BN could be improved by adding B2O3. Because liquid was produced phase when sintering temperature was over the temperature 900C, so it improved Sintering properties of BN and increased the relative density of B2O3 -BN ceramics composites.Keywords:
Relative density
Hot pressing
Elasticity
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Vickers hardness test
Hot pressing
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In the present work, silicon nitride was fabricated with as a sintering additive and its mechanical properties were investigated. Silicon nitride with 3, 5, and 7wt% of was prepared and sintered by a Hot Pressing (HP) technique at 1750 and for 2 h. The process was performed under different process pressures of 30 and 45 MPa. Mechanical properties (density, strength, hardness, and fracture toughness) were investigated as a function of the content in . ceramics showing similar mechanical properties compared with ceramics. But its high temperature strength was considerably higher than that of ceramics.
Hot pressing
Mechanical strength
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Powder Metallurgy
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Using MnO2 as sintering aids,the influence of MnO2 content and sintering process on sintering ability and properties of 8YSZ were investigated.Archimedes principle,hardness-testing devices and universal-testing machine was employed to measure the relative density,hardness and bending strength of the sintered bulk.XRD and SEM were also used to analyze the crystallographic phase,microstructure of the sintered bulk.The results show that the relative density of the sintered bulk increases with the increase of the proportion of MnO2.The best sintering ability is obtained when 3%MnO2 is doped.The relative density of the sintered bulk also increases as the temperature rises.The relative density reaches 98.59%,and the hardness and flexural strength reach 1830.21(HV) and 235.46 MPa respectively,when the sintering temperature is 1 300 ℃ and soaking time is 4 h.
Relative density
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This paper presents the investigation of the effect of sintering temperature on mechanical properties of Al/SiC composites. The composites were produced via conventional powder metallurgy processing. The particle size of Al and SiC powders are 63 µm and 37 µm respectively. The sintering temperatures exerted on the samples were 550, 570, 590, 610, 630 and 650oC at a fixed time of 1 h. The compressive, hardness and impact tests were performed on the sintered samples to characterize their mechanical properties. It was found that as the sintering temperature increase, the mechanical properties of the samples were also increased at earlier temperature and show a decrease trend thereafter. Similarly, this trend was also observed in the density test. Furthermore, microscopic observations showed that the porosity level decrease as the sintering temperature increase excluding at the temperature of 650oC.
Powder Metallurgy
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Wave-transparent composites of BN/SiO2 were prepared via hot pressure sintering at 1650 °C of mechanically alloyed amorphous SiBON powders.
Thermal shock
Content (measure theory)
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The effects of BN content on the thermal conductivity, hardness and microstructure of AlN-BN composite ceramics prepared by ceramic injection molding (CIM) and pressureless sintering, as well as the rheological characteristics of the mixtures were discussed. The results showed that the mixtures had good fluidity and low temperature dependence of viscosity, suitable for ceramic injection molding. It was found that the thermal conductivity, relative density and hardness of the ceramics decreased with increasing BN content, which was attributed to the low conductivity and hardness of BN self and its card house structure generated during the sintering that can delay the densification process of the composite ceramics. In view of the demand on the thermal conductivity and hardness, a better content of BN in AlN-BN composite ceramics is thought to be from 10% to 15%, at which, the thermal conductivity of the composite ceramics is more than 120 W·m-1·K-1, the hardness in HRA is less than 80, and the relative density is more than 90%.
Relative density
Molding (decorative)
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Nanocrystalline material
Hot isostatic pressing
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Al2O3-SiC composite ceramics was prepared from Al2O3 and SiC particles by hot-pressed sintering.The bending strength,fracture toughness,density and fractograph were individually measured and analyzed by three-point bending method,single edge notched beam method,Archimedes principle and scanning electronic microscope.The results show that the relative density of Al2O3-SiC10wt% composite ceramics increases with the increasing of the sintering temperature,and the max relative density is about 98.42%;the bending strength increases as the increasing of the sintering temperature,and the maximum is 623MPa;the fracture toughness has the same trend,especially a fracture toughness up to 7.9MPa·m1/2 was achieved when sintered at 1850℃.The key fracture manner is intercrystalline fracture,but the ratio of transcrystalline fracture raise as the temperature increasing.
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AlON-AlN composite ceramics were prepared with Y2O3 as sintering additive by pressureless reaction sintering in nitrogen atmosphere.The phase compositions and microstructure of AlON-AlN composite ceramics were characterized by XRD and SEM.The effects of sintering temperature and Al2O3 and Y2O3 content on sintering performance,mechanical properties and thermal conductivity were studied.The results show that the AlON-AlN composite ceramics could be fabricated at 1 650-1 800 ℃.As the temperature increased,the bend strength and thermal conductivity both increased first and then decreased,and the maximum values(378 MPa,38 W·m-1·K-1) were gained respectively at 1 750 ℃ and 1 700 ℃.As the Al2O3 content increased,the bend strength of the sample increased till Al2O3 content up to 30%,and then decreased.The thermal conductivity decreased obviously with the increase of Al2O3 content.The bend strength increased remarkably as the Y2O3 content increased while the maximum of thermal conductivity appeared when the Y2O3 content was 3%.
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