| 摘要 |
PURPOSE:To remarkably improve the preservation performance of phosphoric acid in a matrix by setting the peak of the fine hole distribution in the matrix within the specific range. CONSTITUTION:Granular silicon carbide with the grain size distribution 0.1-1mum and the average grain size 0.3-0.5mum and polytetra fluoroethylene with the grain size 0.05-0.5mum are used as raw materials, and the peak of the fine hole distribution of a matrix thus obtained is set within the range 0.05-0.10mum. The mixing ratio of both materials is set to silicon carbide 90-99wt.% and polytetra fluoroethylene 1-10wt.%. A lubricant such as ethylene glycol and water may be mixed in addition to both materials, and the lubricant smooths the mixing of both materials and supplies a uniform mixture. The mixing ratio at this time is set to silicon carbide 90-99wt.%, polytetra fluoroethylene 1-9wt.% and the remainder of the lubricant. |
