Dynamic friction polishing （DFP） is one of the most promising methods appropriate for polishing CVD diamond film with high efficiency and low cost. By this method CVD diamond film is polished through being simply pr...Dynamic friction polishing （DFP） is one of the most promising methods appropriate for polishing CVD diamond film with high efficiency and low cost. By this method CVD diamond film is polished through being simply pressed against a metal disc rotating at a high speed utilizing the thermochemical reaction occurring as a result of dynamic friction between them in the atmosphere. However, the relatively soft materials such as stainless steel, cast iron and nickel alloy widely used for polishing CVD diamond film are easy to wear and adhere to diamond film surface, which may further lead to low efficiency and poor polishing quality. In this paper, FeNiCr matrix-TiC composite used as grinding wheel for polishing CVD diamond film was obtained by combination of mechanical alloying （MA） and spark plasma sintering （SPS）. The process of ball milling, composition, density, hardness, high-temperature oxidation resistance and wear resistance of the sintered piece were analyzed. The results show that TiC was introduced in MA-SPS process and had good combination with FeNiCr matrix and even distribution in the matrix. The density of composite can be improved by mechanical alloying. The FeNiCr matrix-TiC composite obtained at 1273 K was found to be superior to at 1173 K sinterin8 in hardness, high-temperature oxidation resistance and wearability. These properties are more favorable than SUS304 for the preparation of high-performance grinding wheel for polishing CVD diamond film.展开更多
为了探索超高分子量聚乙烯 (UHMWPE)与钛基 - Ti N- Ti C系梯度薄膜材料组合作为人工关节置换材料的可能性 ,利用离子注入和等离子体化学气相沉积 (PCVD)方法制备了 Ti6 Al4V- Ti N- Ti C系梯度薄膜材料。通过摩擦系数和 UHMWPE磨损失...为了探索超高分子量聚乙烯 (UHMWPE)与钛基 - Ti N- Ti C系梯度薄膜材料组合作为人工关节置换材料的可能性 ,利用离子注入和等离子体化学气相沉积 (PCVD)方法制备了 Ti6 Al4V- Ti N- Ti C系梯度薄膜材料。通过摩擦系数和 UHMWPE磨损失重的测定和用 SEM对磨损后的 U HMWPE表面形貌分析 ,研究了 U HMWPE与Ti6 Al4V- Ti N- Ti C系梯度薄膜材料摩擦副的生物摩擦磨损特性。研究表明 :在人血清润滑下 ,随配对的梯度薄膜材料表面硬度的增加 ,UHMWPE磨损量减小。与硬度大的 Ti6 Al4V- Ti N- Ti C梯度薄膜材料对磨时 ,UHMWPE的磨损量最小 ,为该摩擦副作为人工关节置换材料提供了依据。还对各摩擦副的 U展开更多
基金supported by the National Natural Science Foundation of China under grant No. 50575034.
文摘Dynamic friction polishing （DFP） is one of the most promising methods appropriate for polishing CVD diamond film with high efficiency and low cost. By this method CVD diamond film is polished through being simply pressed against a metal disc rotating at a high speed utilizing the thermochemical reaction occurring as a result of dynamic friction between them in the atmosphere. However, the relatively soft materials such as stainless steel, cast iron and nickel alloy widely used for polishing CVD diamond film are easy to wear and adhere to diamond film surface, which may further lead to low efficiency and poor polishing quality. In this paper, FeNiCr matrix-TiC composite used as grinding wheel for polishing CVD diamond film was obtained by combination of mechanical alloying （MA） and spark plasma sintering （SPS）. The process of ball milling, composition, density, hardness, high-temperature oxidation resistance and wear resistance of the sintered piece were analyzed. The results show that TiC was introduced in MA-SPS process and had good combination with FeNiCr matrix and even distribution in the matrix. The density of composite can be improved by mechanical alloying. The FeNiCr matrix-TiC composite obtained at 1273 K was found to be superior to at 1173 K sinterin8 in hardness, high-temperature oxidation resistance and wearability. These properties are more favorable than SUS304 for the preparation of high-performance grinding wheel for polishing CVD diamond film.
文摘为了探索超高分子量聚乙烯 (UHMWPE)与钛基 - Ti N- Ti C系梯度薄膜材料组合作为人工关节置换材料的可能性 ,利用离子注入和等离子体化学气相沉积 (PCVD)方法制备了 Ti6 Al4V- Ti N- Ti C系梯度薄膜材料。通过摩擦系数和 UHMWPE磨损失重的测定和用 SEM对磨损后的 U HMWPE表面形貌分析 ,研究了 U HMWPE与Ti6 Al4V- Ti N- Ti C系梯度薄膜材料摩擦副的生物摩擦磨损特性。研究表明 :在人血清润滑下 ,随配对的梯度薄膜材料表面硬度的增加 ,UHMWPE磨损量减小。与硬度大的 Ti6 Al4V- Ti N- Ti C梯度薄膜材料对磨时 ,UHMWPE的磨损量最小 ,为该摩擦副作为人工关节置换材料提供了依据。还对各摩擦副的 U
