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首页> 外文会议>International Symposium on Multifunctional and Functionally Graded Materials(FGM2004); 20040711-14; Leuven(BE) >Development of Square-shaped Large-size WC/Co/Ni system FGM Fabricated by Spark Plasma Sintering(SPS) Method and Its Industrial Applications
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Development of Square-shaped Large-size WC/Co/Ni system FGM Fabricated by Spark Plasma Sintering(SPS) Method and Its Industrial Applications

机译：火花等离子体烧结法制备方形大尺寸WC / Co / Ni体系FGM的研制及其工业应用

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摘要

As a typical high wear-resistant hard material, WC/Co system cemented carbides are now widely used in various press-stamping dies and cutting tools for industrial applications. In recent years in Japan, a rapid sintering method called Spark Plasma Sintering (SPS) method or Pressure assisted Pulsed Electric Current Sintering (PECS) method has attracted attention to fabrication of dense bulk Functionally Graded Materials (FGMs) and Nano-phase materials. In order to improve the mechanical properties of monolithic hard materials into the surface with high wear-resistance and the inside with high toughness with more functionality, a compositionally graded WC/Co/Ni system FGM was studied. Using an Automatic FGM Manufacturing SPS machine, Square-shaped Large-size WC/Co/Ni system FGMs of 70mm (width) X 100mm (length) X 8～60mm (thickness) with 3-layers graded composition of WC0.5 μm / Co6 wt%, WC3.5 μ m / Co15 wt% and WC5 μ m / Ni20 wt% were homogeneously fabricated in a cycle time of one per less than one hour. The hardness of the top and bottom layers containing 6 wt% Co, 20 wt% Ni were 20 GPa and 8 GPa respectively. The grain growth of the 0.5, 3.5 and 5 μ m WC starting powder particles were minimized and well controlled. WC/Co and WC/Ni FGM systems were also studied. The developed WC/Co/Ni FGM showed a new weldable function to normal steel materials without any cracks and delaminations. The FGMs were practically applied to a screw component of extruding machine as the practical industrial use. It was successfully achieved more than 3 times longer tool life time at economical running cost. The gradient functions in both of weldability and machinability contribute to the application field in Tool & Die industry.
机译：作为一种典型的高耐磨硬质材料，WC / Co系统硬质合金现已广泛用于各种压模模具和工业应用的切削工具中。近年来，在日本，称为火花等离子体烧结（SPS）方法或压力辅助脉冲电流烧结（PECS）方法的快速烧结方法引起了对致密块状功能梯度材料（FGM）和纳米相材料制造的关注。为了使整体硬质材料的机械性能提高到具有高耐磨性的表面和具有更高功能性的高韧性内部，研究了成分分级的WC / Co / Ni系统FGM。使用自动FGM Manufacturing SPS机器，对70mm（宽）X 100mm（长）X 8〜60mm（厚）的方形大型WC / Co / Ni系统FGM进行三层分级，WC0.5μm/以小于一小时的一小时的循环时间均匀地制造了Co6 wt％，WC3.5μm / Co15 wt％和WC5μm / Ni20 wt％。包含6wt％的Co，20wt％的Ni的顶层和底层的硬度分别为20GPa和8GPa。 0.5、3.5和5μmWC起始粉末颗粒的晶粒生长被最小化并得到良好控制。还研究了WC / Co和WC / Ni FGM系统。研发的WC / Co / Ni FGM对普通钢材显示出新的可焊接功能，没有任何裂纹和分层。 FGM作为工业上的实际应用而实际应用于挤出机的螺杆部件。它以经济的运行成本成功实现了3倍以上的使用寿命。焊接性和切削性中的梯度函数有助于工具和模具行业的应用领域。

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