Valve disks of silicon-infiltrated silicon carbide
First Claim
1. A valve disk of silicon-infiltrated silicon carbide material for control elements for regulating liquid flows, in particular for service-water mixer valves, the silicon carbide material containing 70 to 90% by weight of silicon carbide and 8 to 30% by weight of silicon with a content of at most 0.2% by weight of free carbon and containing at most 0.1% by volume of closed pores, wherein the valve disk has a functional surface in which isolated islands of bearing surfaces are surrounded by a level lying lower with respect to the isolated islands, the functional surface having the following microtopographical characteristics over its entire region:
- Ra 0.02 to 0.80 μ
m, preferably 0.15 to 0.40 μ
mRt 0.50 to 6.00 μ
mRz 0.20 to 1.00 μ
mFlatness 0.0002 to 0.01 mmtpi 40 to 80% (at 0.3 μ
m cut depth)tpa 10 to 60% (at 0.3 μ
m cut depth).
1 Assignment
0 Petitions
Accused Products
Abstract
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 μm, preferably 0.15 to 0.40 μm; Rt : 0.50 to 6.00 μm,; Rz : 0.20 to 100 μm: flatness: 0.0002 to 0.01 mm; tpi : 40 to 80% (at 0.3 μm cut depth); tpa : 10 to 60% (at 0.3 μm cut depth). The invention also relates to a process for producing the valve disk.
8 Citations
7 Claims
-
1. A valve disk of silicon-infiltrated silicon carbide material for control elements for regulating liquid flows, in particular for service-water mixer valves, the silicon carbide material containing 70 to 90% by weight of silicon carbide and 8 to 30% by weight of silicon with a content of at most 0.2% by weight of free carbon and containing at most 0.1% by volume of closed pores, wherein the valve disk has a functional surface in which isolated islands of bearing surfaces are surrounded by a level lying lower with respect to the isolated islands, the functional surface having the following microtopographical characteristics over its entire region:
-
Ra 0.02 to 0.80 μ
m, preferably 0.15 to 0.40 μ
mRt 0.50 to 6.00 μ
mRz 0.20 to 1.00 μ
mFlatness 0.0002 to 0.01 mm tpi 40 to 80% (at 0.3 μ
m cut depth)tpa 10 to 60% (at 0.3 μ
m cut depth). - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification