【摘要】 为了提高传统涂层刀具的抗磨损性能 ,利用溶胶 -凝胶技术研制成功了两种新型粉末涂层陶瓷刀具。采用双相氧化铝———二氧化硅溶胶涂层后的TiC制备出了新型涂层刀具XFTC1,采用单相二氧化硅溶胶涂层后的TiC制备出了新型涂层刀具XFTC2。对两种材料断口形貌的SEM观察表明 ,硬质合金TiC颗粒表面被均匀地涂有一层氧化铝—二氧化硅或二氧化硅陶瓷材料 ,而且新陶瓷刀具材料具有均匀的微观组织结构。力学性能和切削实验表明 ,同普通刀片硬涂层刀具相比 ,XFTC1刀具具有很强的抗磨损能力 ;当加工中碳钢 ( 4 5HRC)时 ,新型粉末涂层陶瓷刀具的磨损寿命比普通陶瓷刀具提高 1倍 ,且新涂层材料的断裂韧性和抗弯强度分别提高了 69～ 86%和 5～ 15 %。更多还原

【Abstract】 In order to improve the wear resistance of traditional coating tools, two kinds of advanced cutting tools which can be re ground have been developed with ceramic coated powders by the sol-gel and hot pressing technology. A suitable set of coating and sintering technology was optimized. The titanium matrix coating tools XFTC1 fabricated from TiC powders coated with double phase alumina silicon dioxide sol and XFTC2 fabricated from TiC powders coated with single phase silicon dioxide sol are prepared. A scanning electron microscope (SEM) observation reveals that, in general the matrix (TiC) grains are uniformly coated with the alumina silicon dioxide or the silicon dioxide ceramic and the microstructure of the new tool materials is more homogeneous than that of conventionally made ceramics. The tests of mechanical properties and wear resistance in machining are finally conducted. It is shown that when compared with a hard coated carbide tool, the new material XFTC1 with double phase alumina silicon dioxide coating exhibits a superior ability in maintaining the wear resistance during the entire tool life. When machining a mild carbon steel the new tool materials can increase the tool life by up to 100% as compared to a ceramic tool materials that has the same matrix but fabricated in the conventional way, while the fracture toughness and bending strength are improved by up to 69～86% and 5～15% respectively.更多还原