Chromium carbide plating on diamond powder

Abstract: The invention discloses a method for coating the surface of diamond micropowder with chromium carbide, which belongs to the field of diamond surface treatment. The main process is to put the pretreated diamond powder into a chromium-containing ammonium salt solution and stir evenly, heat to prepare a precursor, put it in a microwave oven, heat and coat in a flowing protective atmosphere, and finally clean it. The diamond fine powder whose surface is plated with chromium carbide is obtained. The invention has the advantages of simple operation, cheap and easy-to-obtain raw materials, high plating efficiency, low cost, and high bonding force between the plating layer and the diamond.

       Main claim: 1. a method for diamond micropowder surface coating chromium carbide, it is characterized in that being realized by the following steps: a, diamond surface pretreatment, its concrete process is: 1 part of diamond micropowder is carried out successively degreasing treatment, thick Chemical treatment, washing to neutrality; b. Preparation of chromium-containing precursor, the specific process is as follows: dissolve 0.1 to 4 parts of chromium-containing ammonium salt and 0 to 5 parts of flux in water, and then add 1 Parts of diamond micro-powder that have been surface-treated in step a, stirred evenly to obtain a suspension, and then heated to 100°C to 280°C for 0.5h to 4h to obtain precursor powder; c. Microwave plating, the specific process is: The precursor powder is placed in a corundum crucible, the corundum crucible containing the precursor powder is placed in a high-temperature microwave oven, and the cavity of the high-temperature microwave oven is replaced by gas to fill it with protective gas, and then heated to 700 in a flowing protective gas atmosphere. ℃ to 1100 ℃, keep the temperature for 20min to 120min and then cool down to room temperature with the furnace; d, after-treatment of diamond plated, the specific process is: put the product obtained in step c into hot potassium bromate solution for 1 minute to 5min, wash with water Clean and dry.