DEVELOPING PRODUCTS FOR LINEAR SLIDER USING POROUS CARBON MATERIAL

从回收利用的角度出发，需要对稻壳和米皮进行新的利用。米壳炭材料(RHS炭)和米糠炭材料(RB炭)是通过将稻壳/米糠颗粒与苯酚树脂混合，在1173K至1773K的温度范围内加压成型、干燥、然后碳化而制成的。这些多孔碳材料有望用作衬里导轨和线性滑块中的滑动元件。该材料具有低杨氏模数、低摩擦系数和高耐磨性等独特的力学性能。然而，由于天然材料中含有一些无机成分，预计在碳化过程中会产生水溶性和吸水性无机化合物。米皮中含有无机成分P、K和Mg。因此，RB碳含有吸湿性磷酸盐化合物和碳酸盐化合物等水溶性化合物。在水环境和高湿度条件下，RB炭担心强度退化和吸湿膨胀。相反，由于稻壳中的大部分无机成分是硅，所以RHS炭中生成的无机化合物几乎是二氧化硅，在湿和水条件下都是稳定的。然后讨论了RHS和RB炭在长时间浸水后的机械强度和吸湿膨胀性能。改性RB炭和RHS炭在水浸后仍保持较高的抗压强度。此外，RHS碳的吸湿性膨胀相当低，约为0.015%。结果清楚地表明了RHS碳的优势。

New utilization of rice hull and rice bran is required from a viewpoint of the recycling. The rice hull carbon material (RHS carbon) and the rice bran carbon material (RB carbon) are manufactured by mixing the rice-hull/rice-bran particles with a phenol resin, pressure forming, drying, and then carbonizing in the temperature range from 1173K to 1773K. These porous carbon materials are expected to use as a sliding element in liner guides and linear sliders. The materials have some unique mechanical properties such as low Young's modulus, low friction coefficient and high abrasion resistance. However, it is anticipated that the water-soluble and absorbency inorganic compounds are produced during the carbonizing, since some inorganic components are included in the natural materials.The rice bran contains P, K and Mg as inorganic components. Therefore, the RB carbon contains the water soluble chemical compounds such as the hygroscopic phosphate chemical compound and the carbonate chemical compound. Under the aqueous environment and the high humidity conditions, the RB carbon is worried about the strength degradation and the hygroscopic expansion. By contrast, since the most of the inorganic component is Si in the rice hull, the produced inorganic compound in the RHS carbon is almost silica, which is stable under wet or water ret conditions.In this study, some manufacturing processes were examined to reduce the amounts of inorganic component in the RB carbon. Then, the mechanical strength and hygroscopic expansion after long time water immersing were discussed for the RHS and RB carbons. The high compressive strength was kept after the water immersing for the modified RB carbon and RHS carbon. Moreover, the hygroscopic expansion of the RHS carbon was considerably low of about 0.015%. The results clearly showed the advantage of the RHS carbon.