Consolidation of atomized NiAl powders by plasma activated sintering process
Consolidation of atomized NiAl powders by plasma activated sintering process
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通过等离子体激活烧结工艺固结雾化 NiAl 粉末
DOI：
10.1016/0956-716x(94)90356-5
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
J. Groza
中科院分区：
文献类型：
--
作者：
J. Groza
有几个属性，使NiAl金属间化合物有吸引力的高温结构应用。首先，NiAl比超级合金具有更高的温度能力，密度比超级合金低33%。其次，在高温、高强度金属间化合物中，NiAl具有固有的抗氧化性的特殊优势。出于固结的目的，存在不同的途径来减少高温暴露：通过高施加压力来权衡高温或长加热时间，或者通过等离子体生成来加速致密化过程。前一种方法应用于一些非常规固结技术，例如Ceracon工艺，其中短时间高压应用可以补偿高温或长时间。此外，在Ceracon工艺中的准等静压施加赋予了所施加应力的剪切分量，该剪切分量分解表面氧化物，从而允许在随后的固结期间有效的颗粒结合。正在探索的另一种途径是作为短时间致密化技术-等离子体活化烧结（PAS）-包括初始等离子体产生步骤以制备用于进一步致密化的颗粒表面。PAS最近已被探索作为低扩散率材料的固结方法。
There are several attributes that make NiAl intermetallics attractive for high temperature structural applications. First, NiAl combines higher temperature capabilities than superalloys, at a density 33% lower than superalloys. Second, among high temperature, high strength intermetallic compounds, NiAl has the special advantage of inherent oxidation resistance. For consolidation purposes, there are different avenues to decrease the high temperature exposure: to trade off high temperatures or long heating times by high applied pressure or to accelerate the densification process by plasma generation. The former approach is applied in some non-conventional consolidation techniques such as Ceracon process in which short-time high pressure application may compensate for high temperatures or long times. Additionally, the quasi-isostatic pressure application in the Ceracon process imparts shearing components of the applied stress that break down the surface oxides, thus permitting efficient particle bonding during subsequent consolidation. Another avenue that is being explored as a short time densification technique -- Plasma Activated Sintering (PAS) -- comprises an initial plasma generation step to prepare particle surfaces for further densification. PAS has been recently explored as a consolidation method for low diffusivity materials.