AlSi/h-BN modified cladding material, metal-based composite coating and preparing method thereof
A metal matrix composite and cladding material technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of unsatisfactory improvement of wear resistance of laser cladding layer, difficulty in meeting wear resistance, etc. Hardness, wear resistance improvement, hardness improvement effect
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Embodiment 1
[0053] The preparation method of the AlSi / h-BN modified metal matrix composite coating comprises the steps:
[0054] 1) Using Ti-6Al-4V titanium alloy as the base material, cut the Ti-6Al-4V titanium alloy plate into sample pieces;
[0055] 2) with SiO 2 Grind the surface of the sample with sandpaper to remove the scale on the surface of the sample, clean the sample with alcohol, and dry it for later use;
[0056] 3) Use an electronic balance to weigh cladding powder with a certain mass ratio, pour the weighed powder into a plastic bottle, and use a vortex mixer to mix the powder evenly. The composition of the cladding material is as follows: 97.5wt.% Ni60A+2.5wt.% AlSi / h-BN, the composition of AlSi / h-BN powder is as follows: h-BN 30wt.%, Si 14wt.%, the balance is Al , coating the mixed powder on the surface of the substrate with a thickness of 1 mm;
[0057] 4) Adopt TFL-H6000 type cross-flow CO 2 The gas laser is used for laser alloying treatment, the laser power is 2.5k...
Embodiment 2
[0067] The preparation method of alloyed coating is identical with embodiment 1, and control concrete parameter is:
[0068] P=2.5kW, v=300mm / min, 95wt.% Ni60A+5wt.% AlSi / h-BN, the composition of AlSi / h-BN powder is h-BN 30wt.%, Si 14wt.%, the balance is Al, the morphology of the prepared cladding layer is as follows Figure 12 As shown in a and b, there are obvious fusion lines in the bonding area, the cladding layer and the substrate form a good metallurgical bond, and the bottom structure is mainly fine dendrites with low density. The middle and upper parts are dominated by rods and fine dendrites. Due to the long existence of the upper molten pool, the structure is more coarse.
[0069] The hardness and wear resistance of the prepared alloyed coating were tested. The results showed that when the composition of the cladding material was 95wt.%Ni60A+5wt.%AlSi / h-BN, the surface quality of the coating was good and the hardness was high. Good wear resistance.
Embodiment 3
[0071] The preparation method of the metal matrix composite coating is the same as that of Example 1, the difference is that the composition of the cladding material is as follows: 90wt.%Ni60A+10wt.%AlSi / h-BN, and the hardness and Wear resistance test results show that when the composition of the cladding material is 90wt.% Ni60A+10wt.% AlSi / h-BN, the surface quality of the coating is good, more wear-resistant phases are formed in the coating, and the hardness is higher. The wear resistance is better, so the cladding material with this composition has better performance.
[0072] The X-ray diffraction of the prepared coating shows that the cladding layer is mainly composed of TiB, AlN, TiB 2 、Cr 7 C 3 , CrC, TiC, CrN, NiTi, AlNi 2 Ti, Al and other phase composition, such as figure 2 shown. The X-ray diffraction results of AlSi / h-BN powder are as follows figure 1 shown. The morphology of the prepared cladding layer is as follows Figure 14 as shown, Figure 14 In Fig....
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Abstract
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