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Mo-ni-zro2 Gradient Coating and Preparation Method of Laser Direct Deposition
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A technology of laser direct deposition, mo-ni-zro2, applied in the field of materials
Active Publication Date: 2018-08-28
NORTHEASTERN UNIV LIAONING
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[0004] Aiming at the problems of cracking and porosity in the preparation of high-temperature wear-resistant alloy gradient coatings by existing laser direct deposition forming (3D printing), the present invention provides a Mo-Ni-ZrO 2 Gradient coating and laser direct deposition preparation method; from the perspective of material design, with the goal of laser preparation of molybdenum-nickel based composite materials with good wear resistance, Mo and Ni metal powders are selected, and ZrO 2 The powder method eliminates the cracks that are easy to appear in the deposited layer, and improves the hardness of the coating, and prepares a wear-resistant coating without cracks and other defects. Under the optimized composite powder composition formula and laser direct deposition forming technology, a High-temperature and wear-resistant Mo-Ni-ZrO with no cracks, no pores and other defects prepared by advanced preparation technology of laser direct deposition forming 2 Alloy Gradient Coating
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Embodiment 1
[0046] A Mo-Ni-ZrO 2 Gradient coating consisting of Mo metal powder, Ni metal powder and ZrO 2 Powder composite, with 3 gradient layers; among them, the first gradient layer is 30%Mo+69%Ni+1%ZrO 2 Composite powder, the second gradient layer is 35%Mo+64.1%Ni+0.9%ZrO 2 Composite powder, the third gradient layer is 40%Mo+59.2%Ni+0.8%ZrO 2 Composite powder, the particle size of Mo metal powder is 70-80 μm, the particle size of Ni metal powder is 70-80 μm, ZrO 2 The particle size of the powder is 20-40nm;
[0047] The Mo-Ni-ZrO of this embodiment 2 Gradient coating, the thickness of the first gradient layer is 0.7mm, the thickness of the second gradient layer is 0.7mm, and the thickness of the third gradient layer is 0.6mm; the substrate combined with it is 3Cr2W8V alloy steel.
[0048] The aforementioned Mo-Ni-ZrO 2 The laser direct deposition preparation method of gradient coating comprises the following steps:
[0049] Step 1, mixing treatment of composite powder:
[005...
Embodiment 2
[0092] A Mo-Ni-ZrO 2 Gradient coating consisting of Mo metal powder, Ni metal powder and ZrO 2 Powder composite, with 3 gradient layers; among them, the first gradient layer is 40%Mo+59.2%Ni+0.8%ZrO 2 Composite powder, the second gradient layer is 35% Mo + 64.1% Ni + 0.9% ZrO 2 Composite powder, the third gradient layer is 30%Mo+69%Ni+1%ZrO 2 Composite powder, the particle size of Mo metal powder is 70-80 μm, the particle size of Ni metal powder is 70-80 μm, ZrO 2 The particle size of the powder is 20-40nm;
[0093] The Mo-Ni-ZrO of this embodiment 2 Gradient coating, the thickness of the first gradient layer is 2.1mm, the thickness of the second gradient layer is 2.1mm, and the thickness of the third gradient layer is 2.1mm; the substrate combined with it is Q235 alloy steel.
[0094] The aforementioned Mo-Ni-ZrO 2 The laser direct deposition preparation method of gradient coating comprises the following steps:
[0095] Step 1, mixing treatment of composite powder:
...
Embodiment 3
[0108] A Mo-Ni-ZrO 2 Gradient coating consisting of Mo metal powder, Ni metal powder and ZrO 2 Powder composite, with 3 gradient layers; among them, the first gradient layer is 30%Mo+69%Ni+1%ZrO 2 Composite powder, the second gradient layer is 35%Mo+64.1%Ni+0.9%ZrO 2 Composite powder, the third gradient layer is 40%Mo+59.2%Ni+0.8%ZrO 2 Composite powder, the particle size of Mo metal powder is 70-80 μm, the particle size of Ni metal powder is 70-80 μm, ZrO 2 The particle size of the powder is 20-40nm;
[0109] The Mo-Ni-ZrO of this embodiment 2 Gradient coating, the thickness of the first gradient layer is 1.2mm, the thickness of the second gradient layer is 0.7mm, and the thickness of the third gradient layer is 1.6mm; the substrate combined with it is 24CrNiMo alloy steel.
[0110] The aforementioned Mo-Ni-ZrO 2 The laser direct deposition preparation method of gradient coating comprises the following steps:
[0111] Step 1, mixing treatment of composite powder:
[01...
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Abstract
The invention discloses a Mo-Ni-ZrN2 gradient coating layer and a laser direct deposition preparation method. The gradient coating layer has multiple gradient layers; each gradient layer is compounded by Mo metal powder, Ni metal powder and ZrO2 powder; and the composite powder of two adjacent gradient layers is not totally the same in mass percentage. The preparation method comprises the following steps: 1) materials are weighed and mixed for ball milling and dried to obtain the composite powder according to the component ratios of all gradient layers of the gradient coating layer; 2) a substrate is subjected to derusting and degreasing, and is pickled and dried for future use; and 3) a semiconductor laser is adopted; the composite powder serves as the raw material; and under the protection of inert gas, the direct laser deposition is performed on the surface of the substrate layer by layer according to the sequence of set gradient layers through direct deposition parameter control until the Mo-Ni-ZrN2 gradient coating layer with a needed size is obtained. The coating layer reaches the average hardness of 420-477 HV, is excellent in toughness, and is applied to the laser additive manufacturing field of such friction parts as high-speed train brake discs, nuclear power emergency diesel engine shafts and molybdenum piercing mandrels.
Description
technical field [0001] The invention belongs to the field of material technology, in particular to a Mo-Ni-ZrO 2 Gradient coating and laser direct deposition preparation method. Background technique [0002] Molybdenum-nickel alloy has good high-temperature wear resistance, and is one of the important materials for preparing high-temperature friction parts. Laser direct deposition forming technology (3D printing) is one of the advanced technologies for preparing high wear-resistant parts and their functional coatings. Different from traditional subtractive processing technology, laser direct deposition metal forming technology uses high energy of laser The metal powder and the surface of the metal substrate are melted, and after cooling, a metallurgical bonding coating is formed on the metal substrate or the production process of depositing formed parts. This technology has the characteristics of fast, no mold, and near-net shape, and the deposited parts have high performa...
Claims
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Application Information
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