Method for preparing Ti-Al-Nb alloy coating on titanium metal surface
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A ti-al-nb, alloy coating technology, applied in the surface modification of titanium metal, in the field of preparation of Ti-Al-Nb alloy coating on the surface of titanium metal, can solve the problem of low hardness, poor wear resistance and large friction coefficient and other problems, to achieve the effect of good wear resistance, high hardness of the coating and dense structure
Active Publication Date: 2014-08-27
JIANGSU UNIV
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[0006] The purpose of the present invention aims at the problem that the surface hardness of existing titanium metal is low, the friction coefficient is large, and the wear resistance is poor, which limits the full play of its performance. -Nb alloy coating method, in order to improve the wear resistance, oxidation resistance and other properties of titanium metal, while maintaining its light weight characteristics
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Embodiment 1
[0029] like figure 1 -7.
[0030] A kind of titanium metal surface Ti-Al-Nb alloy coating, its preparation method is:
[0031] First, take 54.56 grams of Ti powder, 30.22 grams of Al powder, 14.56 grams of Nb powder and Y 2 o 3 0.66 grams of powder, put it in a ball mill and mix evenly (the ball milling process can be realized by using the existing technology), take it out and dry it, and press it into a tablet (thickness is about 0.7mm, the thickest can be pressed to 1mm thick) on a press to get prefabricated Compacted sheet.
[0032] Secondly, place the prefabricated pressed sheet prepared in the previous step on the cleaned titanium surface, and use YLS-6000 fiber laser for laser cladding. The process parameters are: laser power 1.8KW, scanning speed 300mm / min, spot 2mm in diameter. That is, a Ti-Al-Nb alloy coating on the surface of titanium metal is obtained.
[0033] The coating structure that this embodiment obtains is compact ( figure 1 ), the interface is tight...
Embodiment 2
[0035] This embodiment is similar to the embodiment, except that the adopted laser process parameters are: laser power 1.6KW, scanning speed 300 mm / min, spot diameter 2mm.
[0036] The coating structure that this embodiment obtains is compact ( Figure 8 ), the average hardness is HV588.3.
Embodiment 3
[0038] This embodiment is similar to the embodiment, except that the laser process parameters used are: laser power 2.0KW, scanning speed 300 mm / min, spot diameter 2mm.
[0039] The coating obtained in this embodiment: dense tissue ( Figure 9 ), the average hardness is HV531.6.
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Abstract
The invention provides a method for preparing a Ti-Al-Nb alloy coating on a titanium metal surface. The method is characterized by comprising the steps of prefabricating a pressed slice of mixed powder formed by Ti powder, Al powder, Nb powder and Y2O3 powder and carrying out laser cladding treatment, wherein the step of prefabricating the pressed slice of mixed powder comprises the processes of firstly mixing the Ti powder, Al powder, Nb powder and Y2O3 powder uniformly with a ball mill, secondly drying the mixture and finally pressing the mixture into a slice on a press machine; the step of carrying out laser cladding treatment comprises the processes of putting the pressed slice on the cleaned titanium metal surface and then carrying out laser cladding processing. The method has the beneficial effects that the cladding process has excellent properties; the coating has dense tissue and is good in interface bonding; the main composition phases of the coating are Ti3Al and AlNb2; the change of the hardness of the coating along the cross section is small; the average hardness is about HV530-600, and the wear resistance is about three times that of a matrix; the composition elements of the Ti-Al-Nb alloy coating are resistant to oxidation and corrosion, so that the Ti-Al-Nb alloy coating has extensive application fields.
Description
technical field [0001] The invention relates to the field of metal surface modification, in particular to a titanium metal surface modification technology, in particular to a method for preparing a Ti-Al-Nb alloy coating on the titanium metal surface. Background technique [0002] Titanium metal has outstanding advantages such as high specific strength, excellent corrosion resistance, and good biocompatibility, and is widely used in aerospace, weaponry, and civil industries. However, its low hardness, large friction coefficient and poor wear resistance limit its full performance. [0003] As we all know, TiAl intermetallic compound is a very competitive light-weight, wear-resistant, high-temperature-resistant, and oxidation-resistant structural material. Among them, β-type γ-TiAl also has good plasticity and toughness, and it is a leading player in the field of intermetallic compounds in recent years. Research hotspots. [0004] Laser cladding and laser alloying technology...
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