Abstract
The pressureless sintering behaviors of two widely used submicron alumina (MgOdoped and undoped) with different solid loadings produced by injection molding have been studied systematically. Regardless of the sinterability of different powders depending on their inherent properties, solid loading plays a critical role on the sintering behavior of injection molded alumina, which greatly determines the densification and grain size, and leads to its full densification at low temperatures. As compared to the MgO-doped alumina powder, the undoped specimens exhibit a higher sinterability for its smaller particle size and larger surface area. While full densification could be achieved for MgO-doped powders with only a lower solid loading, due to the fact that MgO addition can reduce the detrimental effect of the large pore space on the pore-boundary separation.
Highlights
Ceramic Injection Molding (CIM), developed from a combination of plastic shaping and powder metallurgy, has received extensive attention since 20-30 years ago, for it enables mass production of small and complex-shaped metal or ceramic components
We focused on the influence of solid loading and sintering schedule on the performance of the two different powders
The sintering behaviors of two widely used submicron α-alumina (MgO-doped and undoped) with various solid loadings fabricated by injection molding have been studied systematically
Summary
Ceramic Injection Molding (CIM), developed from a combination of plastic shaping and powder metallurgy, has received extensive attention since 20-30 years ago, for it enables mass production of small and complex-shaped metal or ceramic components. Stability of mechanical properties of well-processed powder-injection-molded ceramic materials are superior to other ceramic molding technology such as slip-casting, gel-casting and cold isostatic pressing for the CIM technology is of high mechanization. Probability of molding failure, strength of green compacts and Weibull distribution of flexural strength of sintered bodies for two commonly used alumina with similar particle size were respectively reported by Lin et al in [1,2]. They provide guidelines for the selection of optimum solid loading which should usually be high but a little less than the critical values for
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