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TiBw-NiTi composite coating and preparation method thereof

A technology of composite coating and cladding layer, applied in the direction of coating, metal material coating process, improvement of process efficiency, etc., can solve the problems of poor plastic deformation resistance and toughness, poor fatigue resistance, etc. The effect of toughness

Active Publication Date: 2020-06-19
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiB 2 It is a brittle phase of ceramics, and its poor resistance to plastic deformation and toughness can easily lead to poor fatigue resistance

Method used

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  • TiBw-NiTi composite coating and preparation method thereof
  • TiBw-NiTi composite coating and preparation method thereof
  • TiBw-NiTi composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a TiB w -The preparation method of NiTi composite coating, comprises the steps:

[0034] (1) Preliminary preparation: Ti-6Al-4V alloy is selected as the substrate, and its composition is calculated by weight percentage: aluminum 6.01%, vanadium 3.84%, iron 0.3%, sulfur 0.15%, carbon 0.1%, oxygen 0.1%, nickel 0.15% % and the balance of titanium; put the Ti-6Al-4V alloy substrate into a closed atmosphere controllable processing protection room, and place the induction heater on the lower part of the substrate and fasten it; put the TiB with a purity of 99.9% 2 Powder and Ti powder with a purity of 99% are compounded at a weight ratio of 1:3 to obtain a mixed powder, TiB 2The particle size of the powder is 0.5-10 μm, and the particle size of the Ti powder is 1-10 μm; the mixed powder is mixed in a vertical high-energy ball mill for 120 minutes, then dried at 120 ° C for 60 minutes, and then put into a coaxial powder feeder; Argon gas with an atom...

Embodiment 2

[0038] This embodiment provides a TiB w -The preparation method of NiTi composite coating, comprises the steps:

[0039] (1) Preliminary preparation: select TA2 alloy as the substrate, and its composition is calculated by weight percentage: nitrogen 0.03%, hydrogen 0.015%, iron 0.3%, oxygen 0.25%, carbon 0.1% and the rest of the titanium; the purity is 99.9% TiB 2 Powder and Ti powder with a purity of 99.1% are compounded at a weight ratio of 1:2 to obtain a mixed powder, TiB 2 The powder particle size is 130-150 μm, and the Ti powder particle size is 180-200 μm; mix the mixed powder in a vertical high-energy ball mill for 150 minutes, then dry it at 120 ° C for 90 minutes, and then put it into a coaxial powder feeder; Argon gas with an atomization size of 50-70 μm and a purity of 99.99% is used as a shielding gas and a mixed powder delivery gas, and the amount of mixed powder delivered is 30g / min;

[0040] (2) Prepare the cladding layer: turn on the laser beam heat source ...

Embodiment 3

[0043] This embodiment provides a TiB w -The preparation method of NiTi composite coating, comprises the steps:

[0044] (1) Preliminary preparation: Ti-6Al-4V alloy is selected as the substrate, and its composition is calculated by weight percentage: aluminum 6.01%, vanadium 3.84%, iron 0.3%, sulfur 0.15%, carbon 0.1%, oxygen 0.1%, nickel 0.15% % and the balance of titanium; put the Ti-6Al-4V alloy substrate into a closed atmosphere controllable processing protection room, and place the induction heater on the lower part of the substrate and fasten it; put the TiB with a purity of 99.9% 2 Powder and Ti powder with a purity of 99.1% are compounded at a weight ratio of 1:2.5 to obtain a mixed powder, TiB 2 The particle size of the powder is 90-100 μm, and the particle size of the Ti powder is 80-90 μm; the mixed powder is mixed in a vertical high-energy ball mill for 120 minutes, and then an appropriate amount of 2123 phenolic resin is used as a binder, and the TiB 2 The powd...

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Abstract

The invention relates to a TiBw-NiTi composite coating and a preparation method thereof. The TiBw-NiTi composite coating contains TiBw crystals and NiTi crystals, the area percentage of the TiBw crystals is 30-50%, and the area percentage of the NiTi crystals is 40-60%, and the total area percentage of Ti crystals and TiB2 crystals does not exceed 10%. The preparation method comprises the steps that (1) the TiB2 powder and Ti powder are evenly mixed, so that mixed powder is obtained; (2) in an inert atmosphere, the mixed powder obtained in the step (1) is conveyed to the surface of a base plate to be prepared into a cladding layer; and (3) the Ni powder is pre-placed on the surface of the cladding layer obtained in the step (2), and after completion, the TiBw-NiTi composite coating is obtained. The obtained TiBw-NiTi composite coating greatly eliminates existence of a Ti matrix and TiB2 in the composite coating, and the tenacity, dry sliding wear resistance and anti-fatigue performanceof the TiBw-NiTi composite coating can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a TiB w -NiTi composite coating and preparation method thereof. Background technique [0002] TiB w As an in-situ self-generated reinforcing phase commonly used in the preparation of titanium matrix composites, it has the following advantages: TiB w The diameter of TiB is very small, so that there are few defects inside the crystal, its atoms are highly ordered, and its strength is close to the theoretical value of a complete crystal, so the Young's modulus and tensile strength of TiB are much higher than that of titanium and titanium alloys; TiB and TiB There is no chemical reaction between the Ti matrix, and a fixed orientation relationship can be obtained, and the interface structure can be combined in a coherent or semi-coherent form, which is conducive to improving the mechanical properties and fatigue properties of the composite coating; the density and therma...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/103Y02P10/25
Inventor 林英华林振衡陈庆堂唐群华窦景欣雷永平符寒光
Owner NANHUA UNIV
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