| 摘要 |
<p>A valve disk of silicon-infiltrated silicon carbide material for control elements for regulating liquid flows is suitable in particular for service-water mixer valves. The silicon carbide material contains 70 to 90% by weight of silicon carbide and 8 to 30% by weight of silicon with a content of most 0.2%, by weight of free carbon and contains at most 0.1% by volume of closed pores. The valve disk has a functional surface having the optical appearance in the form of isolated islands of bearing surfaces surrounded by a level lying lever with respect to the isolated islands, the functional surface having the following microtopographical characteristics over its entire region: Ra: 0.02 to 0.80 (my)m, preferably 0.15 to 0.40 (my)m; Rt: 0.50 to 6.00 (my)m,; Rz: 0.20 to 100 (my)m: flatness: 0.0002 to 0.01 mm; tpi: 40 to 80% (at 0.3 (my)m cut depth); tpa: 10 to 60% (at 0.3 (my)m cut depth). The invention also relates to a process for producing the valve disk.</p> |
