The effects of microwave sintering on the properties, phases and microstructure of W-2OCu alloy, using composite powder fabricated by spray pyrolysis-continuous reduction technology, were investigated. Compared with t...The effects of microwave sintering on the properties, phases and microstructure of W-2OCu alloy, using composite powder fabricated by spray pyrolysis-continuous reduction technology, were investigated. Compared with the conventional hot-press sintering, microwave sintering to W-2OCu composites could be achieved with lower sintering temperature and shorter sintering time. Furthermore, microwave sintered W-Cu composites with high densification, homogenous microstructure and excellent properties were obtained. Microwave sintering could also result in finer microstructures. ：~展开更多
Dense Si3N4-BN composite ceramics were.fabricated by spark plasma sintering at 1500,1600 and 1650℃under 50 MPa for 5 min using Si3N4 and BN powders as starting materials and 2 mass%Al2O3 and 6 mass%Y2O3 as sintering ...Dense Si3N4-BN composite ceramics were.fabricated by spark plasma sintering at 1500,1600 and 1650℃under 50 MPa for 5 min using Si3N4 and BN powders as starting materials and 2 mass%Al2O3 and 6 mass%Y2O3 as sintering additives.The volume fraction of BN in Si3N4-BN composite powders was chosen as 10%,20%,and 30%,respectively.The results oJ XRD and SEM show thatχ-Si3N4 completely turns intoβ-Si3N4 when the composite ceramics are sintered at 1650℃;the addition of BN hinders the growth of Si3N4 grains,reigning the structure;Vickers hardness and fracture toughness of the composite ceramics decrease with the increase of BN content.展开更多
基金the Project for Science and Technology Plan of Wuhan City (No. 200910321092)the Youth Science Plan for Light of the Morning Sun of Wuhan City (No. 200750731270)the Fundamental Research Funds for the Central Universities (No. 2010-Ⅱ-020)
文摘The effects of microwave sintering on the properties, phases and microstructure of W-2OCu alloy, using composite powder fabricated by spray pyrolysis-continuous reduction technology, were investigated. Compared with the conventional hot-press sintering, microwave sintering to W-2OCu composites could be achieved with lower sintering temperature and shorter sintering time. Furthermore, microwave sintered W-Cu composites with high densification, homogenous microstructure and excellent properties were obtained. Microwave sintering could also result in finer microstructures. ：~
基金supported by the National Natural Science Foundation of China with grant number of 50374007
文摘Dense Si3N4-BN composite ceramics were.fabricated by spark plasma sintering at 1500,1600 and 1650℃under 50 MPa for 5 min using Si3N4 and BN powders as starting materials and 2 mass%Al2O3 and 6 mass%Y2O3 as sintering additives.The volume fraction of BN in Si3N4-BN composite powders was chosen as 10%,20%,and 30%,respectively.The results oJ XRD and SEM show thatχ-Si3N4 completely turns intoβ-Si3N4 when the composite ceramics are sintered at 1650℃;the addition of BN hinders the growth of Si3N4 grains,reigning the structure;Vickers hardness and fracture toughness of the composite ceramics decrease with the increase of BN content.
