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首页> 外文期刊>Materials Science and Engineering >Pulsed electric current sintering and characterization of ultrafine Al_2O_3-WC composites
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Pulsed electric current sintering and characterization of ultrafine Al_2O_3-WC composites

机译：超细Al_2O_3-WC复合材料的脉冲电流烧结及表征。

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摘要

Ultrafine Al_2O_3 powder mixtures with up to 80 vol% ultrafine WC were prepared and consolidated by pulsed electric current sintering (PECS) for 4min at 1250-1750℃ under a mechanical pressure of 60 MPa. Fully dense composites with ≤40 vol% WC could be achieved when PECS at 1450℃ for 4min, whereas 1650℃ was needed for the WC matrix composites. The microstructure, electrical conductivity and mechanical properties of the composites were assessed as a function of the WC content. Microstruc-tural analysis showed that Al_2O_3 and WC grain growth was significantly suppressed due to secondary phase addition, resulting in ultrafine (<500 nm) microstructures. Excellent mechanical properties, combining a Vickers hardness of 25 GPa, fracture toughness of 4.8 MPa m~(1/2) and flexural strength of1000 MPa, as well as electrical conductivity of 1.09E+6 Ω~(-1) m~(-1) were obtained for the Al_2O_3-60 vol% WC composite.
机译：制备了具有80vol％的超细WC的Al_2O_3超细粉末混合物，并通过脉冲电流烧结（PECS）在1250-1750℃，60 MPa的机械压力下固结4分钟。当PECS在1450℃下4min时，可以得到WC≤40 vol％的全致密复合材料，而WC基复合材料则需要1650℃。评价复合材料的微观结构，电导率和机械性能是WC含量的函数。微观结构分析表明，由于添加了第二相，Al_2O_3和WC晶粒的生长得到了显着抑制，从而形成了超细（<500 nm）的微观结构。优异的机械性能，具有25 GPa的维氏硬度，4.8 MPa m〜（1/2）的断裂韧性和1000 MPa的弯曲强度，以及1.09E + 6Ω〜（-1）m〜（-的电导率1）是针对Al_2O_3-60 vol％WC复合材料获得的。

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