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Method for preparing metal-based shs wear-resistant coating by cold isostatic pressing combined with vacuum lost foam
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A technology of vacuum lost foam and cold isostatic pressing, applied in metal material coating process, coating, metal processing equipment, etc., can solve the problem of reducing the ratio of the strengthening phase of the coating system, the low density of the paste coating, and the influence of problems such as the overall performance of the coating, to ensure uniform consistency, complex shapes, and equal forces
Active Publication Date: 2020-01-14
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0004] At present, the paste coating is mainly applied on the foam plastic by hand. Because the density of the paste coating is not high, a large amount of base metal liquid will be immersed in the coating during the molten metal casting process, which reduces the coating system. The proportion of strengthening phase limits its hardness and wear resistance
In addition, the appearance of the coating made by manual coating is rough and irregular, and the density is not uniform, which seriously affects the overall performance of the coating.
Method used
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Embodiment example 1
[0028] (1) Prepare a polystyrene foam plastic mold that meets the size requirements in a foaming machine according to the size requirements of the drawings;
[0029] (2) Utilize cardboard to make a shell of a certain shape and size, inject silica gel, and obtain a mold that can be used for cold isostatic pressing after it solidifies;
[0030] (3) Dosing according to the SHS reaction Ti+C=TiC, following the ratio of the reaction formula, then adding 6wt.% PR solution (mass ratio PTFE: rubber gasoline = 1:3), and ball milling, ball Material ratio 2:1, mixed for 2 hours to obtain mixed powder;
[0031] (4) Pack the mixed powder in the step (3) into the mold in the step (2), carry out cold isostatic pressing after compaction, the pressure is 160MPa, the holding time is 60s, the pressure is relieved and taken out and demoulded to obtain the coated compact;
[0032] (5) Stick the coated compact in step (4) to the plastic foam surface in step (1), and dry it in an oven at 55° C. for...
Embodiment example 2
[0037] (1) Prepare a polystyrene foam plastic mold that meets the size requirements in a foaming machine according to the size requirements of the drawings;
[0038] (2) Utilize cardboard to make a shell of a certain shape and size, inject silica gel, and obtain a mold that can be used for cold isostatic pressing after it solidifies;
[0039] (3) Dosing according to the SHS reaction Ti+C=TiC, following the ratio of the reaction formula, then adding 10wt.% PR solution (mass ratio PTFE: rubber gasoline = 1:5), and ball milling, ball milling Material ratio 2:1, mixed for 2 hours to obtain mixed powder;
[0040] (4) Pack the mixed powder in the step (3) into the mold in the step (2), carry out cold isostatic pressing after compaction, the pressure is 120MPa, the holding time is 40s, the pressure is relieved and taken out and demolded to obtain the coated compact;
[0041] (5) Stick the coated compact in step (4) to the plastic foam surface in step (1), and dry it in an oven at 45...
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Abstract
The invention provides a method for preparing metal-based SHS abrasion-resisting coatings through the combination of isostatic cool pressing and vacuum lost foams and belongs to the technical field ofmetal-based composite preparation. According to the method, an isostatic cool pressing technology is adopted to prepare coating blank blocks which replace traditional manually coated coatings, a PR solution is adopted to replace a traditional PVA water solution, vacuum lost foam casting and self-spreading high-temperature synthesis technologies are combined, and synchronous preparation of the abrasion-resisting coatings and metal casting materials is achieved. The shapes and sizes of the coating blank blocks prepared through the isostatic cool pressing technology are not limited, the densityis even and consistent, the compactness of the coating blank blocks is greatly improved, immersion of a matrix metal solution can be reduced in casting, the ratio of a reinforcement phase of each coating is increased, and the hardness and abrasion resistance of the coatings are greatly improved; and additionally, the PR solution can serve as a binder in the isostatic cool pressing process and a combustion improver in the self-spreading process. The method has the advantages of being easy to operate, high in production efficiency, high in product accuracy, complex in shape, more excellent in coating performance and the like.
Description
technical field [0001] The invention belongs to the technical field of metal-based composite material preparation, and relates to a method for preparing a metal-based SHS wear-resistant coating by cold isostatic pressing combined with vacuum lost foam. Background technique [0002] Many metals and their alloys, such as aluminum and copper alloys, are widely used in aviation, aerospace, automobiles, mechanical equipment and other fields due to their excellent characteristics, but they are limited by factors such as low hardness and poor wear resistance. Its scope of application cannot meet the requirements of high temperature resistance, fatigue resistance and high temperature air erosion resistance. [0003] Vacuum lost foam SHS coating preparation is a method developed in recent years to prepare metal matrix composites, which combines SHS technology and vacuum lost foam casting process. On the one hand, the molten metal in the casting process is used to replace the positio...
Claims
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Application Information
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