A kind of titanium alloy laser surface silicide enhanced multi-element superalloying layer and its preparation method

A technology of superalloy and titanium alloy, applied in metal material coating process, coating and other directions, can solve the problems of reducing the thermal stability of the coating, large difference in thermal expansion coefficient, easy to produce cracks, etc., and achieve good resistance to dry sliding friction. Wear performance, small friction coefficient, smooth fluctuation effect

Active Publication Date: 2019-09-24
QINGDAO BINHAI UNIV
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Problems solved by technology

[0006] However, the above-mentioned coatings also have the following disadvantages: a single Ti-Al coating is brittle and prone to penetrating cracks; the composition of the MCrAlY coating and the titanium alloy substrate is quite different, and interdiffusion between the coating and the substrate during the oxidation process The phenomenon is serious, leading to the appearance of brittle phases and diffusion voids, thereby reducing the thermal stability of the coating; oxide coatings, enamel coatings, and nitride coatings have a large difference in thermal expansion coefficient from the substrate, so under high temperature conditions Easy to crack and even fall off

Method used

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  • A kind of titanium alloy laser surface silicide enhanced multi-element superalloying layer and its preparation method
  • A kind of titanium alloy laser surface silicide enhanced multi-element superalloying layer and its preparation method
  • A kind of titanium alloy laser surface silicide enhanced multi-element superalloying layer and its preparation method

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preparation example Construction

[0031] The preparation method of the above-mentioned titanium alloy laser surface silicide-enhanced multi-element high-temperature alloying layer includes the following steps:

[0032] (1) Fully mix the alloying powder, and use the volume ratio Na 2 SiO 3 :H 2 The water glass solution of O=1:3 presets the alloyed powder on the surface of the Ti-6Al-4V alloy, the preset thickness is 0.8-1.0mm, and dries;

[0033] (2) with cross-flow CO 2 The continuous laser performs laser surface alloying on the sample in step 1), the laser power is 3.0-3.5kW, the scanning speed is 300mm / min, the spot size is 10mm×1mm, and the argon gas is blown sideways for protection, and the argon gas flow rate is 30L / min. min.

[0034] The method for testing the performance of the laser surface silicide-enhanced multi-element high-temperature alloying layer involved in the present invention is as follows:

[0035] (1) Microhardness: Use the HVS-1000 microhardness tester to test the hardness of the cla...

Embodiment 1

[0039] With Ti-6Al-4V alloy as the base material, the configuration (mass ratio) of the alloyed powder is Al:Nb:Si=100:10:10.

[0040] 1) Mix the alloyed powder evenly, and use the volume ratio Na 2 SiO 3 :H 2The water glass solution of O=1:3 presets the alloyed powder on the surface of the Ti-6Al-4V alloy, the preset thickness is 0.8-1.0mm, and dries;

[0041] 2) with cross-flow CO 2 The continuous laser performs laser surface alloying on the sample in step 1), the laser power is 3.0-3.5kW, the scanning speed is 300mm / min, the spot size is 10mm×1mm, and the argon gas is blown sideways for protection, and the argon gas flow rate is 30L / min. min.

[0042] The corresponding laser surface silicide-enhanced multi-component superalloying layer was named Al-10Nb-10Si coating, and the microstructure, hardness, tribological properties and high-temperature oxidation behavior of the coating were tested and analyzed.

[0043] The alloying layer is mainly composed of TiAl and Ti 5 S...

Embodiment 2

[0047] Using Ti-6Al-4V alloy as the base material, the configuration (mass ratio) of the alloyed powder is Al:Nb:Si=100:10:20.

[0048] 1) Mix the alloyed powder evenly, and use the volume ratio Na 2 SiO 3 :H 2 The water glass solution of O=1:3 presets the alloyed powder on the surface of the Ti-6Al-4V alloy, the preset thickness is 0.8-1.0mm, and dries;

[0049] 2) with cross-flow CO 2 The continuous laser performs laser surface alloying on the sample in step 1), the laser power is 3.0-3.5kW, the scanning speed is 300mm / min, the spot size is 10mm×1mm, and the argon gas is blown sideways for protection, and the argon gas flow rate is 30L / min. min.

[0050] The corresponding laser surface silicide-enhanced multi-component superalloying layer was named Al-10Nb-20Si coating, and the microstructure, hardness, tribological properties and high-temperature oxidation behavior of the coating were tested and analyzed.

[0051] The alloying layer is mainly composed of TiAl and Ti 5...

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Abstract

The invention provides a titanium alloy laser surface silicide enhanced multielement high-temperature alloying layer. A titanium alloy Ti-6Al-4V serves as a base material, mixed powder composed of aluminite powder, niobium powder and silica powder serves as an alloying powder material to be arranged in the surface of the titanium alloy Ti-6Al-4V base material in advance, and a laser surface alloying technology is adopted for preparation, wherein the purity of the aluminite powder is higher than or equal to 99.0%, the grain diameter of the aluminite powder ranges from 50 microns to 100 microns, the purity of the niobium powder is higher than or equal to 99.5%, the grain diameter of the niobium powder ranges from 50 microns to 100 microns, the purity of the silica powder is higher than or equal to 99.5%, the grain diameter of the silica powder ranges from 50 microns to 100 microns; and the alloying powder material is prepared from, by weight, 100 parts of the aluminite powder, 10-20 parts of the niobium powder and 10-20 parts of the silica powder. The alloying layer is simple in composition proportion, the extremely-high hardness and the good high temperature frictional wear resistance are shown, and the excellent long-term high temperature oxidation resistance is achieved.

Description

technical field [0001] The invention relates to material surface engineering technology, in particular to a titanium alloy laser surface silicide-enhanced multi-element high-temperature alloying layer, and also relates to a preparation method for a titanium alloy laser surface silicide-enhanced multi-element high-temperature alloying layer. Background technique [0002] Due to its high specific strength, corrosion resistance, good biocompatibility and stable medium temperature performance, titanium alloys are widely used in aerospace, chemical, biomedical, automotive, electronics, shipbuilding and other fields, especially in aerospace Due to its low density, it is one of the lightweight high-temperature materials with broad application prospects. However, the maximum service temperature of traditional titanium alloys does not exceed 350°C. When the service temperature limit is exceeded, the problems of oxidation and oxygen embrittlement will seriously affect the application ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C21/00C22C21/02C22C32/00
Inventor 戴景杰陈传忠翟明戈李守英王阿敏张丰云
Owner QINGDAO BINHAI UNIV
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