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CN-117512589-B - Preparation method of titanium alloy gun tube annealing device with Ta-W coating

CN117512589BCN 117512589 BCN117512589 BCN 117512589BCN-117512589-B

Abstract

The invention provides a preparation method of a titanium alloy gun tube annealing device with a Ta-W coating, which comprises the following steps of S1, printing an annular body of the titanium alloy annealing device by adopting a laser 3D printing technology, S2, turning and cleaning the inner wall of the printed annular body, S3, clamping the annular body with the pretreated inner wall on a workbench, synchronously feeding mixed powder of Ta and W powder for laser cladding, and forming the Ta-W coating on the inner wall of the annular body, and S4, machining the clad Ta-W coating to obtain the titanium alloy gun tube annealing device with the Ta-W coating. According to the invention, a 3D printing method is adopted to prepare the high-strength and low-density titanium alloy annealing device so as to reduce the weight of the annealing device, and then a laser cladding is adopted to clad a Ta-W coating on the inner wall of the annealing device so as to form the Ta-W coating which is in high-strength metallurgical bonding with the annealing device matrix, thereby obviously improving the high-temperature airflow scouring resistance and ablation resistance of the annealing device.

Inventors

  • ZHANG QIAN
  • DAI YIFAN

Assignees

  • 无锡市福莱达石油机械有限公司

Dates

Publication Date
20260505
Application Date
20231107

Claims (7)

  1. 1. A preparation method of a titanium alloy gun tube annealing device with a Ta-W coating is characterized in that the titanium alloy gun tube annealing device comprises an annular body (1) and a Ta-W coating (2) arranged on the inner wall of the annular body (1), and the preparation method comprises the following steps: s1, printing an annular body (1) of the titanium alloy annealing device by adopting a laser 3D printing technology; S2, turning and cleaning the inner wall of the printed annular body (1); Step S3, clamping the annular body (1) with the pretreated inner wall on a workbench to synchronously send mixed powder of Ta and W powder for multi-pass laser cladding, and forming a Ta-W coating (2) on the inner wall of the annular body (1); s4, machining the cladding Ta-W coating (2) to obtain a titanium alloy gun tube annealing device with the Ta-W coating; the mixed powder comprises 75-95% of tantalum powder and 5-25% of tungsten powder by mass percent.
  2. 2. The method for manufacturing the titanium alloy gun tube annealing device with the Ta-W coating according to claim 1, wherein the material used for printing the annular body (1) in the step S1 is biphase titanium alloy powder, different 3D printing technologies are selected for molding according to the size of the annealing device, a small-size annealing device adopts a laser selective melting technology, the powder granularity used by the laser selective melting technology is 15-53 mu m, a large-size annealing device adopts a laser melting deposition technology, and the powder granularity used by the laser melting deposition technology is 53-150 mu m.
  3. 3. The method for manufacturing a titanium alloy gun tube annealing device with a Ta-W coating according to claim 1, wherein the turning speed in the step S2 is 30-60 m/min, the feeding amount during turning is 0.05-0.15 mm/turn, and the turning depth is 0.5-1.5 mm.
  4. 4. The method for manufacturing a titanium alloy gun tube annealing device with a Ta-W coating according to claim 1, wherein the mixed powder granularity of Ta and W powder in the step S3 is 15-53 μm.
  5. 5. The method for manufacturing a titanium alloy gun tube annealing device with a Ta-W coating according to claim 1, wherein the thickness of the Ta-W coating manufactured by laser cladding in the step S3 is 0.6mm, and the lap joint rate between each pass is 50%.
  6. 6. The method for preparing the titanium alloy gun tube annealing device with the Ta-W coating, which is characterized in that in the step S3, the laser power of laser cladding is 0.8-1kW, the beam scanning speed is 100-200mm/min, the spot size is 1.2-1.5mm, the laser cladding process adopts argon protection with the flow rate of 6-8L/min, and the lap joint rate is 50%.
  7. 7. The method for manufacturing a titanium alloy gun barrel remover with a Ta-W coating according to claim 1, wherein the thickness of the Ta-W coating of the titanium alloy gun barrel remover with the Ta-W coating in the step S4 is 0.2-0.4mm.

Description

Preparation method of titanium alloy gun tube annealing device with Ta-W coating Technical Field The invention relates to the technical field of surfaces, in particular to a preparation method of a titanium alloy gun tube annealing device with a Ta-W coating. Background The exit parts of various cannon barrels are often provided with a stopper to reduce recoil force when the cannon shells are launched, but common cannon steel materials are easy to generate high-temperature airflow scouring and ablation under the action of high-temperature and high-pressure fuel gas, so that the inner wall of the stopper is early disabled, in addition, the weight of the steel stopper is larger, and larger bending stress is generated on the cannon barrels; therefore, on one hand, the weight of the annealing device needs to be reduced, on the other hand, the inner wall of the annealing device needs to be coated and protected, the traditional method is to carry out chrome plating on the annealing device so as to improve the ablation and scouring performance of high-temperature resistant air flow of the annealing device, although the chrome plating can improve the service life of the annealing device to a certain extent, the inherent microcracks of the chrome plating layer are easy to expand so as to form large cracks of a penetrating interface, a substrate forms brittle ash areas and white areas, and finally the plating layer is peeled off, therefore, the protection effect of the chrome plating on the annealing device is limited, research finds that the plating layer with higher performance needs to meet the requirements of high melting point, good high-temperature strength, ablation resistant to reactive powder gas, good thermal mechanical performance and substrate matching and good combination, and a certain thickness for protecting the annealing device from mechanical strength reduction caused by thermal action, tantalum and tungsten are known as high melting point, the high-temperature mechanical performance of tantalum and tungsten are also meets the working condition requirements of the annealing device, the high-temperature resistant performance of a real elastic target shows better corrosion performance, pure tantalum (Ta) is expected to further improve the high-temperature resistant flow Ta element and the corrosion resistance performance of the annealing device, on the other hand, if the tungsten alloy is subjected to high-temperature ablation resistance of the annealing device is greatly increased, on the other hand, the annealing device is subjected to high in high corrosion cost is greatly influenced by the annealing device is manufactured, therefore, the Ta-W coating with small thickness is a good method for protecting the inner wall of the light titanium alloy annealing device, but the reduction potential of tantalum and tungsten is more negative and cannot be directly obtained from aqueous solution, while molten salt electroplating can realize molten salt electroplating of tantalum and tungsten, but the molten salt electroplating temperature is higher, so that the microstructure change and performance reduction of a base part are easily caused, and therefore, the development of the light annealing device part with the ablation-resistant coating on the inner wall is urgently needed. Disclosure of Invention The invention aims to overcome and supplement the defects in the prior art and provides a preparation method of a titanium alloy gun tube annealing device with a Ta-W coating, wherein a 3D printing method is adopted to prepare a titanium alloy annealing device with high strength and low density, and then a laser cladding is adopted to clad the Ta-W coating on the inner wall of the annealing device so as to improve the high-temperature airflow scouring resistance and ablation resistance of the annealing device. The technical scheme adopted by the invention is as follows: a preparation method of a titanium alloy gun tube annealing device with a Ta-W coating comprises the following steps: the titanium alloy gun tube annealing device comprises an annular body and a Ta-W coating arranged on the inner wall of the annular body, and the preparation method comprises the following steps: S1, printing an annular body of a titanium alloy annealing device by adopting a laser 3D printing technology; s2, turning and cleaning the inner wall of the printed annular body; step S3, clamping the annular body with the pretreated inner wall on a workbench to synchronously send mixed powder of Ta and W powder for multi-pass laser cladding, and forming a Ta-W coating on the inner wall of the annular body; And S4, machining the cladding Ta-W coating, wherein the dimensional accuracy of an inner hole obtained by machining is not lower than IT7, and the surface roughness is not higher than Ra6.3, so that the titanium alloy gun tube annealing device with the Ta-W coating is obtained. The preparation method of the titanium alloy gun tube an