2results about How to "Change roughness" patented technology

The application discloses a repairing method for a bulk SiC f / SiC ceramic matrix composite component, which mainly comprises the steps of machining pretreatment, fiber preform repairing, fiber line reinforcing and CVI deposition repairing. In the machining pretreatment step, the damaged material is cut into dovetail type protrusions, and the thickness of the part is slightly reduced to leave space for fiber line winding. In the fiber preform repairing step, ceramic fibers are woven into a preform with the same thickness as the dovetail type protrusions in the form of 2.5D, an internal groove matched with the preform is processed, and the preform is spliced with the material to be repaired in the form of a mortise and tenon structure. In the fiber line reinforcing step, SiC fiber lines are cross-wound in perpendicular directions to reinforce the mortise and tenon connection part. In the CVI deposition repairing step, the fiber preform and the fiber lines are deposited by means of a CVI process, so that they become SiC f / SiC ceramic matrix composite, which is closely connected with the damaged part by the cooperation of the dovetail type part, the cross-winding of the fiber lines and the mortise and tenon structure, so that the damaged material is repaired.

This invention discloses an organofluorosilicone emulsion deepening agent, which is made from the following raw materials in parts by weight: 3-9 parts of hexamethylcyclotrisiloxane, 2-4 parts of trifluoropropylmethylcyclotrisiloxane, 1-3 parts of hexamethyldisiloxane, 3-9 parts of vinyldisiloxane, 1-3 parts of emulsifier, 0.1-0.6 parts of catalyst, and 2-6 parts of acrylate monomer. The organofluorosilicone monomer is prepared by ring-opening reaction of hexamethylcyclotrisiloxane, trifluoropropylmethylcyclotrisiloxane, and hexamethyldisiloxane under the action of trifluoromethanesulfonic acid catalyst. Then, the emulsifier is used to emulsify the monomer to obtain organofluorosilicone emulsion I. This invention has a simple preparation method, can reduce dye affinity, and inhibit dye migration. Furthermore, by changing the amount of emulsifier, the particle size of the emulsion can be adjusted, and emulsions of different particle sizes can be mixed together to form a film with different roughness, thus achieving a deepening effect.