Twofold increase in Weibull modulus of hot-pressed Si3N4 ceramic by modified pressing profile
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Weibull modulus
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SiC /ZrB2ceramic matrix composites were prepared by reactive hot pressing at 1850 ℃ under 20 MPa with zirconium diboride,silicon,activated carbon as raw materials. The effects of sintering additives( silicon and activated carbon) content on sintering behavior and mechanical properties of ZrB2 were studied. Phase composition and microstructure of the composites were analyzed by XRD and SEM, respectively. The results indicate that the sintering additives could significantly improve the densities and mechanical properties of the composites. Only the diffraction peaks of ZrB2and SiC were found in the Xray diffraction patterns of the hot-pressed ceramics. For the specimen with sintering additives content of 12wt%,flexural strength of 584 MPa and fracture toughness of 7. 25 MPa·m1 /2were obtained. It seems that the improvement in mechanical properties was attributed to the improvement of density,the decrease of grain size and the change of fracture mode.
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Ceramic particulate dispersed Ti-Al intermetalic compound composites were successfuly fabricated by hot-pressing the mixtures of Ti and Al (Ti/Al=70/30at%) powders with fine ceramic particulates, SiC and B4C, as the second phases. There were a little reactions between the Ti-Al intermetalic compound and ceramic particulate during the hot-pressing. The microstructure observations showed that both reaction phases and second phases were homogeneously dispersed in the Ti-Al matrix. Their mechanical properties on the hardness and strength were improved by these ceramic dispersions. The relationship between mechanical properties and microstructure was discussed for these ceramic particulate reinforced Ti-Al based composites.
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In this paper, flexural strength, fs, of cold isostatically pressed (CIP) high purity alumina ceramics was determined by the three-point bend test. It was found that flexural strength shows a large variation and can be described by a two-parameter Weibull distribution function, with the scale parameter 0, and the Weibull modulus m. These parameters were determined by the linear regression using the measured values of fs. It was found that the measured flexural strength, fs, of alumina ceramics follows the Weibull distribution. The flexural strength values were found to range from 266.7 to 357.5 MPa.
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TiB2 ceramics with Y2O3-Al2O3 as sintering aids were fabricated by hot-pressing. The effects of sintering temperature, holding time, and crystallization annealing on microstructure and mechanical properties were investigated. The experimental results show that the flexural strength and fracture toughness of TiB2 ceramics decrease and the weight loss increases with sintering temperature rising up; with holding time prolonged, the uniformity of microstructure decreases and this is disadvantageous to the mechanical properties. The grain diameter has a significant infiuence on the mechanical properties of TiB2 ceramics. The crystallization annealing can result in YAG phase from grain boundaries and enhance the flexural strength at high temperature of TiB2 ceramics.
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Weibull modulus
Surface Integrity
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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.
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A new ZrO2 nano-composite ceramic tool and die material was prepared with vacuum hot pressing technique. The effects of sintering parameters on the nano-composite ceramic tool and die materials were studied. The results indicated that the mechanical properties of ZrO2 nano-composite ceramic tool and die material with the additions of TiB2 and Al2O3 are higher than that of the pure ZrO2 ceramic material. Sintering at 1100 for 120min could improve the density and mechanical properties of ZrO2 nano-composite ceramic material. The flexural strength, fracture toughness and hardness with the optimum sintering parameters can reach 878MPa, 9.54MPa•m1/2 and 13.48GPa, respectively, obviously higher than that with non-optimum sintering parameters.
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