DEVELOPING PRODUCTS FOR LINEAR SLIDER USING POROUS CARBON MATERIAL

从回收利用的角度出发，需要对稻壳船体和米糠进行新的利用。所述稻壳船体碳材料（RHS碳）和米糠碳材料（RB碳）通过将所述稻壳船体/米糠颗粒与酚醛树脂混合、加压成型、干燥、然后在1173 K至1773 K的温度范围内碳化而制造。这些多孔碳材料有望用作线性导轨和线性滑块中的滑动元件。该材料具有低杨氏模量、低摩擦系数和高耐磨性等独特的力学性能。然而，由于米糠中含有一些无机成分，在炭化过程中可能会产生一些水溶性和吸收性的无机化合物，米糠中含有P、K和Mg等无机成分。因此，RB碳含有吸湿性磷酸盐化合物、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炭担心强度下降和吸湿膨胀。与此相反，由于稻壳船体中的无机成分大部分是Si，因此RHS碳中产生的无机化合物几乎都是二氧化硅，在湿态或水湿态下都是稳定的。然后，对RHS和RB炭的机械强度和长时间浸水后的吸湿膨胀进行了讨论。改性后的RB炭和RHS炭在浸水后仍保持较高的抗压强度。此外，RHS碳的吸湿膨胀相当低，约为0.015%。结果清楚地显示了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.