초록 ▼

The method includes the phases of preparation of said ceramic discs once lapped and polished; and deposition of a layer of hydrogenated amorphous carbon (or DLC: Diamond-Like Carbon) on said ceramic discs, said deposition phase including the following stages: exposure of said ceramic discs to vacuum

The method includes the phases of preparation of said ceramic discs once lapped and polished; and deposition of a layer of hydrogenated amorphous carbon (or DLC: Diamond-Like Carbon) on said ceramic discs, said deposition phase including the following stages: exposure of said ceramic discs to vacuum; application of a cleaning plasma on said ceramic discs; application of a first deposition plasma on said ceramic discs; and application of a second deposition plasma on said ceramic discs. The ceramic disc is characterized in that it includes a layer of hydrogenated amorphous carbon deposited directly onto the ceramic disc. Thereby are obtained ceramic discs for utilization in mixer valves of single-lever mixer type whose friction coefficient is lower that that of the ceramic discs currently used, all this without loss of leak tightness, without having to use grease and with a low manufacturing cost.

대표청구항 ▼

1. Method for coating previously lapped and polished ceramic discs, characterized in that it includes the phases of: preparation of said ceramic discs; and deposition of a layer of hydrogenated amorphous carbon on said ceramic discs; with said deposition phase including the following stages:

1. Method for coating previously lapped and polished ceramic discs, characterized in that it includes the phases of: preparation of said ceramic discs; and deposition of a layer of hydrogenated amorphous carbon on said ceramic discs; with said deposition phase including the following stages: exposure of said ceramic discs to a vacuum; application of a cleaning plasma on said ceramic discs; application of a first deposition plasma on said ceramic discs; and application of a second deposition plasma on said ceramic discs. 2. Method according to claim 1, characterized in that said deposition is carried out by chemical vapour deposition assisted by radio frequency plasma. 3. Method according to claim 1, characterized in that said deposition stage is carried out at room temperature. 4. Method according to claim 1, characterized in that said cleaning plasma is applied by means of argon, at a pressure between 8 and 12 Pa, with an auto polarization power of between -1000 and -600 V and for a period of time of between 4 and 10 minutes. 5. Method according to claim 1, characterized in that said first deposition plasma is applied by means of methane, at a pressure between 8 and 12 Pa, with an auto polarization power of between -400 and -1000 V, with a radio frequency power between 250 and 275 W, and for a period of time of between 2 and 5 minutes. 6. Method according to claim 1, characterized in that said second deposition plasma is applied by means of methane, at a pressure between 8 and 12 Pa, with an auto polarization power of between -300 and -700 V, with a radio frequency power between 40 and 60 W, and for a period of time of between 5 and 9 minutes. 7. Method according to claim 1, characterized in that said phase of preparation of the ceramic discs includes the following phases: cleaning of the ceramic discs; drying of said ceramic discs; and evaporation of substances impregnated in said ceramic discs. 8. Method according to claim 7, characterized in that said cleaning of the ceramic discs is carried out by means of acetone and ethanol baths in an ultrasound washer for a period of time between 15 and 25 minutes.