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首页> 外文会议>Materials science and technology VII >Influences of Cobalt and Zirconia on Microstructural Features and Mechanical Properties of the Al_2O_3/WC Composites
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Influences of Cobalt and Zirconia on Microstructural Features and Mechanical Properties of the Al_2O_3/WC Composites

机译：钴和氧化锆对Al_2O_3 / WC复合材料显微组织和力学性能的影响

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Alumina (Al_2O_3) is one of the most successful advanced ceramics due to its high hardness, chemical resistance as well as thermal stability under various severe operating conditions. Therefore, the Al_2O_3 and Al_2O_3 matrix composites were generally employed as cutting tool materials. The present work investigates an improvement in fracture toughness of the Al_2O_3-based composites reinforced by tungsten carbide (WC) particles. A change in toughness of the Al_2O_3/WC composites according to the additions of cobalt (Co) or partially stabilized zirconia (PSZ) is also of interest. The 90 wt% of Al_2O_3 and 10 wt% of WC powders, containing various amounts of Co or MgO-doped PSZ (Mg-PSZ), were formed by a conventional uniaxial pressing. The percentages of Co and Mg-PSZ were varied up to 3 and 4.5 wt%, respectively. The specimens were sintered in argon atmosphere at 1600 ℃ for 2 hours. The sintered specimens were subjected to testing and characterisation. The density was measured by water immersion method. Microstructure and phase analysis were investigated by scanning electron microscopy (SEM) and X-ray diffractometry (XRD), respectively. Vickers indentation technique was used to determine hardness and fracture toughness. Density of higher than 95% of the theoretical values could be achieved in all cases. The hardness values of the WC reinforced Al_2O_3 composites were higher than those of the monolithic Al_2O_3. The hardness of the composites did not change significantly with the Co addition but it gradually decreased with PSZ additions. However, the presence of both Co and PSZ led to slightly higher fracture toughness. The hardness and fracture toughness of the fabricated composites were in the range of 16-18 Gpa and 5-8 Mpa.m~(1/2), respectively, which were in the same ranges as commercial cutting tools currently used in the market.
机译：氧化铝（Al_2O_3）由于其高硬度，耐化学性以及在各种恶劣操作条件下的热稳定性而成为最成功的高级陶瓷之一。因此，Al_2O_3和Al_2O_3基复合材料通常被用作切削刀具材料。本工作研究了碳化钨（WC）颗粒增强的Al_2O_3基复合材料的断裂韧性的提高。还关注根据钴（Co）或部分稳定的氧化锆（PSZ）的添加来改变Al_2O_3 / WC复合材料的韧性的方法。通过常规的单轴压制形成包含各种量的Co或MgO掺杂的PSZ（Mg-PSZ）的90重量％的Al_2O_3和10重量％的WC粉末。 Co和Mg-PSZ的百分比分别变化至3和4.5重量％。将样品在氩气氛中于1600℃下烧结2小时。对烧结后的样品进行测试和表征。通过水浸法测量密度。显微结构和相分析分别通过扫描电子显微镜（SEM）和X射线衍射仪（XRD）进行研究。使用维氏压痕技术确定硬度和断裂韧性。在所有情况下都可以达到高于理论值95％的密度。 WC增强的Al_2O_3复合材料的硬度值高于整体式Al_2O_3。复合材料的硬度随添加Co的变化不明显，但随PSZ添加而逐渐降低。但是，Co和PSZ的存在导致断裂韧性略高。制成的复合材料的硬度和断裂韧性分别在16-18 Gpa和5-8 Mpa.m〜（1/2）的范围内，与目前市场上使用的商用切削工具处于相同的范围内。

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