| 摘要 |
PURPOSE:To obtain an apex seal highly resistant against abrasion and thermal impact forming it with a special composition of materials and making a sliding part of a chill texture and a mother material part of a beynite structure. CONSTITUTION:An apex seal 1 is fitted inside a seal groove 3 provided at the top of a rotor 2 to maintain the airtightness between neighboring operation rooms 6 and 7 closely attached to the inside of a rotor housing by a spring 4. The material of the seal 1 is composed of 2.5-4,0% of C, 1.5-3.0% of Si, less than 1.0% of Mn, 0.25-2.0% of Ni, 0.25-2.0% of Mo, 0.25-2.0% of Cu, 0.05- 0.3% of B, 0.2-1.5% of Cr, 0.05-1.0% of V and the rest of Fe on the basis of weight ratio. The sliding part is made of chill texture with more than 55% are ratio of carbide, and the mother material part is made of beynite texture with less than 15% area ratio of carbide.
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