Wear behavior of diamond-silicon nitride composites sintered with FAST/SPS
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Both n- and p-type SnSe polycrystalline bulks were fabricated by MA + SPS process without any chemical doping.
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Wear behavior and microhardness of some W/Cu functionally graded materials obtained by spark plasma sintering Claudiu NICOLICESCU, Victor Horia NICOARĂ, Florin POPA, Traian Florin MARINCA Abstract. This paper is focused on the elaboration of some W/Cu functionally graded materials (FGM) by spark plasma sintering (SPS) process, as well as on their characterization, from the wear […]
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The densification and the microstructure of silicon nitride ceramics depends on processing parameters, mainly the sintering conditions and the amount and type of sintering aids necessary to promote liquid phase sintering. In this work, selected compositions of silicon nitride containing different amounts and type of sintering additives, were normal sintered at 1700°C and 1750°C, and gas pressure sintered under 25, 60 and 100 bar of nitrogen pressure, varying, also, the soaking time and final sintering temperature. Densification rates ware determined using a dilatometer coupled to the gas pressure sintering furnace. Gas pressure sintering has shown to be an effective route for densification of silicon nitride ceramics with low quantities of sintering aids. Densities greater than 99.5% of theoretical density were obtained for compositions containing only 5wt.% of sintering aids by using multiple steps of temperatures up to 1950°C and 100 bar N 2 pressure.
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The paper considers preparation of a strong and dense ceramics based on silicon nitride by sintering in a SHS reactor. As a sintering agent, an additive was used in the Al2O3-CaO system. The content of the additive varied from 5 to 15 wt. %. It is established that an increase in the amount of silicon introduced into the initial charge increases the strength characteristics of the material due to the formation of secondary silicon nitride during sintering.
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The amorphous nano-sized silicon nitride powders were sintered by liquid phase sintering method. Si3N4-Si2N2O composites were in-situ fabricated. The Si2N2O phase was generated by an in-situ reaction 2Si3N4(s)+1.5O2(g)=3Si2N2O(s)+N2(g). The content of Si2N2O phase up to 60% was obtained at a sintering temperature of 1650°C and reduced when the sintering temperature increased or decreased, which indicates that the reaction is reversible. The mass loss, relative density and average grain size increase with increasing of sintering temperature. The average grain size is less than 500nm when the sintering temperature is below 1700°C. During the sintering procedure, there is a complex crystallization and phase transition: amorphous Si3N4 → equiaxial α-Si3N4→ equiaxial β-Si3N4 → rod-likeSi2N2O → needle-like β-Si3N4. Small round-shaped β-Si3N4 particles are entrapped in the Si2N2O grains and a high density of staking faults are situated in the middle of Si2N2O grains at a sintering temperature of 1650°C.
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Abstract Silicon nitride has been prepared by heating pure silicon in purified nitrogen at 1450°. X ‐ray studies showed the presence of two nitrides, and a method was therefore devised to separate them. Although these nitrides differ in their crystal structure, they have the same compositions, corresponding to Si3N4. A few chemical tests were performed on finely divided silicon nitride prepared at or above 145°. Several alloys containing various proportions of silicon were nitrided under different conditions, and the X ‐ray diffraction patterns of the nitrides extracted from these alloys were found to be in complete agreement with that of α‐Si 3 N 4 . The diffraction lines obtained from the nitrided alloy prior to any chemical treatment gave nitride lines which did not correspond to those of the α‐Si 3 N 4 or β‐Si 3 N 4 .
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普通流动和 sintering 相配矿石的 Sintering 特征例如矿化作用能力，液体产生能力，巩固力量，被检验在 sintering 掌握流动的行为和效果。基于基本研究，泉华壶测试被执行获得优化泉华流动结构的原则。当 sintering 相配矿石与石灰质的流动结合了，结果证明强壮的矿化作用能力，液体阶段产生能力，和巩固力量被获得，当当 sintering 相配矿石与镁的流动结合了，相对差的 sintering 特征被获得时。高反应的生石灰应该被使用像一样在 sintering 混合可能。当生石灰被使用而不是石灰石，它在 sintering 混合的适当比例在 4wt% 附近时，它到达了更好的 sintering 结果。在保证 MgO 内容的房屋上，白云石数量应该被减少，并且为白云石的生石灰的替换引起了更好的 sintering 结果。颗粒度蛇应该与比 2 公里小的一种合适的尺寸被精制。划分增加方法的申请与生石灰的 30wt% 和燃料的 70wt% 带了最好的 sintering 表演。
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ESCA is used to characterize silicon nitride surface oxidation. Si 2p, N 1s, and O 1s binding energies and photoelectron line intensities of oxidized nitride films are compared with the corresponding lines from thick reference films of silicon, silicon nitride, silcon dioxide, and a series of oxynitrides. Rapid initial oxidation of silicon nitride surfaces occurs at room temperature on exposure of nitride films to air. A graded oxidized nitride film forms between the film surface and the nitride. Similarly, oxynitride films with gradations in composition are obtained upon oxidation of nitride films at high temperatures.
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