Diamond/metal carbide composite coating and its preparation method and application
A technology of metal carbide and diamond coating, which is applied in the direction of metal material coating process, metal processing equipment, coating, etc., can solve the problems of poor toughness, increase of non-diamond phase, and decrease of hardness, so as to improve thermal stability, Effect of improving oxidation resistance, good impact resistance and static pressure strength
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Embodiment 1
[0027] The present embodiment provides a kind of preparation method of diamond / metal carbide composite coating, it comprises the following steps:
[0028] (1) Firstly, the super-nano-diamond suspension is used to clean the surface of the substrate to be deposited with a diamond / metal carbide composite coating, and after drying, sandblasting is performed to remove defects, oxide layers and other impurities on the surface of the substrate; then the processed The substrate to be deposited is placed in a cobalt-removing solution to control the cobalt content on its surface to 6% to obtain a pretreated deposition substrate.
[0029] (2) Place the pretreated deposition substrate in chemical vapor deposition equipment, control the vacuum degree of the chemical vapor deposition equipment cavity to be less than 0.1 Pa, and then pass hydrogen gas into the cavity and heat it, when the surface of the pretreated deposition substrate When the temperature is 900°C, methane gas is introduced ...
Embodiment 2
[0036]This example provides a method for preparing a diamond / metal carbide composite coating. The specific steps are roughly the same as those in Example 1, except that step (2) of this example is: depositing the pretreatment The substrate is placed in the chemical vapor deposition equipment, and the vacuum degree of the chemical vapor deposition equipment cavity is controlled to be less than 0.1pa, and then hydrogen gas is introduced into the cavity and heated until the surface temperature of the pre-treated deposition substrate is 700°C, and then the Feed methane gas to deposit microcrystalline diamond coating reaction, wherein, the volume percentage of hydrogen is controlled to be 98.5%, the volume percentage of methane is 1.5%, the pressure in the equipment cavity is 0.03 MPa, and the reaction time is 3.5 hours, thus in the described Depositing a layer of microcrystalline diamond coating with a thickness of 2 microns on the surface of the pretreatment deposition substrate; ...
Embodiment 3
[0043] This example provides a method for preparing a diamond / metal carbide composite coating. The specific steps are roughly the same as those in Example 1, except that step (2) of this example is based on the microcrystalline diamond coating After depositing a layer of nanocrystalline diamond coating with a thickness of 2 microns on the surface, repeat the above steps of depositing microcrystalline diamond coating and nanocrystalline diamond coating, thereby depositing three groups of composite diamond coatings on the surface of the pretreatment deposition substrate. layer structure unit, thus making a deposited diamond matrix.
[0044] The surface of the composite diamond coating structural unit deposited on the outermost side in the step (3) is a layer of metal vanadium layer, and the deposition substrate with metal vanadium deposited on the surface is placed in a vacuum heat treatment furnace at a temperature of 850°C Under vacuum heat treatment for 60 minutes, the interf...
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