Wear-resistant and antifriction metal-ceramic composite coating process for hot-work die steel
A composite technology of hot work die steel and ceramics, which is applied in the coating process and coating of metal materials, and can solve the problem of uneven distribution of powder, uneven structure and performance of chemically reactive cladding layers, high temperature and wear resistance of coatings Insufficient performance and other problems, to achieve the effect of performance improvement
Inactive Publication Date: 2016-12-07
JINAN UNIVERSITY
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Problems solved by technology
The main disadvantage is that the density and powder distribution of the added powder are often uneven, and due to the influence of the wettability, stability, expansion coefficient and chemical reactivity of the powder and the matrix, the uneven structure and performance of the cladding layer are likely to occur. In addition, the high temperature wear resistance of the coating is still insufficient
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[0031] Step (1) powder mixing,
[0032] First, TiC 20% by mass, CaF 25%, Y 2 O 3 1%, Ni60 67.5% distribution ratio to configure cladding mixed powder; then put it into a ball mill, under the protection of high-purity argon, ball mill for 6 hours and mix evenly;
[0033] Among them, the mass percentage of Ni60 powder composition is C 0.85%, Cr 16%, Si 4.5%, B3.6%, Fe 14%, Ni balance.
[0034] Step (2) Select a hot work die steel H13 steel as the base material, cut the sample and carry out surface pretreatment on the sample,
[0035] The sample is cut by wire cutting method, the size of the sample is 50mm×40mm×8mm (length×width×thickness), the oxide film on the surface is removed by grinding with sandpaper, washed with alcohol and then dried.
[0036] (3) Mix the mixed powder and binder at a volume ratio of 1:3 to make a paste, and then evenly coat it on the surface of the sample to form a layer of preset powder with a thickness of about 400 μm. drying.
[0037] (4) Prehe...
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The invention provides a wear-resistant and antifriction metal-ceramic composite coating process for hot-work die steel. The wear-resistant and antifriction metal-ceramic composite coating process comprises the following steps: carrying out ball-milling powder mixing on Ni60 nickel-based alloy powder with a certain ratio, TiC powder, CaF2 powder and Y2O3 powder at first, then coating the surface of the hot-work die steel to prepare a powder pre-coated layer, then melting the powder pre-coated layer by virtue of laser surface scanning, and finally forming a layer of TiC-CaF2-Y2O3-Ni60 wear-resistant and antifriction metal-ceramic composite coating on the surface of the hot-work die steel. According to the wear-resistant and antifriction metal-ceramic composite coating process provided by the invention, the TiC-CaF2-Y2O3-Ni60 metal-ceramic composite coating prepared by taking the hot-work die steel as a matrix material, adding the components TiC, CaF2 and Y2O3 in a Ni60 self-melting alloy cladding layer, and carrying out an optimization process, is capable of reducing the friction factor of the hot-work die steel, increasing the surface hardness, improving the wear resistance, heat resistance, oxidation resistance and other performance, and expanding the use range of the hot-work die steel; and the process is also convenient for die repair and the like.
Description
technical field [0001] The invention belongs to the technical field of surface modification of metal materials, relates to a metal-ceramic composite coating, and in particular relates to a laser cladding wear-resistant and friction-reducing metal-ceramic composite coating process on the surface of hot-working die steel. Background technique [0002] Hot work die steel is mainly used to manufacture dies used in hot working of various metal and alloy materials, such as hammer forging dies, hot extrusion dies and die casting dies. The working environment temperature of hot work die is high, and it is often subjected to repeated tensile and compressive stress caused by heating and cooling, as well as wear and corrosion caused by metal (liquid) flow. Common failure forms are: thermal fatigue, fracture, plastic deformation, Thermal wear and thermal melt loss, etc. The annual output value of hot work die steel in my country exceeds 50 billion yuan. According to local statistics, t...
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Login to View More IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 刘英李卫赵雪阳
Owner JINAN UNIVERSITY