A preparation method of laser rapid prototyping niobium-tungsten alloy nozzle

A technology of laser rapid prototyping and alloy spraying, which is applied in the field of nozzle preparation, can solve the problems of low processing efficiency, increased material brittleness, unavoidable powder oxidation, etc., and achieve the effects of short processing cycle, improved hardness and brittleness, and low cost

Active Publication Date: 2017-01-04
TAICANG PAIOU TECH CONSULTING SERVICE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Both of the above two inventions can produce nozzles with high melting points, but the oxidation of the powder cannot be avoided during the preparation process, which increases the brittleness of the prepared material; molds are required in the preparation process, and the processing efficiency is low

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  • A preparation method of laser rapid prototyping niobium-tungsten alloy nozzle

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Embodiment 1

[0024] A preparation method of laser rapid forming niobium-tungsten alloy nozzle, characterized in that it comprises the following steps:

[0025] (1) Use CAD drawing software to design the three-dimensional solid model of the nozzle, and use the discrete program to slice the model to obtain a multi-layer two-dimensional section of the solid model, and save it as an STL file, and transfer the data of the STL file to the selective laser Sintering rapid prototyping system;

[0026] (2) Evenly mix tungsten powder and niobium powder in a ratio of 5% and put them into the powder cylinder of the 3D printer;

[0027] (3) Pass protective gas into the molding cylinder of 3D printer;

[0028] (4) Evenly spread a layer of niobium-tungsten powder with a thickness of 0.08mm on the working table with a powder spreading roller, and preheat the working table to 2000°C;

[0029] (5) The scanning speed of the design laser is 20mm / s, the sintering temperature is 2500°C, and the laser is contro...

Embodiment 2

[0035] A preparation method of laser rapid forming niobium-tungsten alloy nozzle, characterized in that it comprises the following steps:

[0036] (1) Use CAD drawing software to design the three-dimensional solid model of the nozzle, and use the discrete program to slice the model to obtain a multi-layer two-dimensional section of the solid model, and save it as an STL file, and transfer the data of the STL file to the selective laser Sintering rapid prototyping system;

[0037] (2) Evenly mix tungsten powder and niobium powder in a ratio of 15% and put them into the powder cylinder of the 3D printer;

[0038] (3) Pass protective gas into the molding cylinder of 3D printer;

[0039] (4) Evenly spread a layer of niobium-tungsten powder with a thickness of 0.3mm on the working table with a powder spreading roller, and preheat the working table to 2200°C;

[0040] (5) The scanning speed of the design laser is 200mm / s, the sintering temperature is 2700°C, and the laser is contr...

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Abstract

The invention provides a preparation method of a niobium-tungsten alloy nozzle for laser rapid prototyping, which is characterized by comprising the following steps: (1) Designing a three-dimensional solid model of the nozzle with CAD, slicing the model into multi-layer two-dimensional sections, and saving it as STL (2) Put the tungsten powder and niobium powder into the powder cylinder according to a certain proportion; (3) Pass the protective gas; (4) Spread the powder on the work surface and preheat the work (5) Design the scanning speed, sintering temperature, etc. of the laser, and control the laser to sinter according to the cross-sectional information of the first layer; (6) Lower the worktable to a certain height, continue to spread powder, and start a new round of scanning and sintering; (7) Continuously Step 6 is repeated until the three-dimensional solid parts are stacked; (8) high temperature baking. The method is highly technically integrated, has a short processing cycle, does not need a mold, and can realize mass production. The protective gas is used to avoid the oxidation of the powder, and the prepared nozzle has excellent comprehensive performance.

Description

technical field [0001] The invention relates to a preparation method of a nozzle, in particular to a preparation method of a laser rapid forming niobium-tungsten alloy nozzle. [0002] technical background [0003] The nozzle is a device that accelerates the airflow by changing the geometric shape of the inner wall of the pipe section. It is mostly used in aerospace fields such as aircraft and rockets. Usually, the working conditions of the nozzle are harsh. Under non-cooling conditions, the nozzle must directly withstand 2500-3600 ℃ high temperature, 4 ~ 7MPa high pressure and 1500 ~ 2500m / s high speed, and need to withstand the erosion and erosion of gas containing solid particles, so the performance requirements of the material are high, not only the material bearing capacity is required, but also the heat resistance is required powerful. Both tungsten and niobium have high melting points. Among them, tungsten has good high-temperature strength and can be used as a struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F5/12
Inventor 陈照峰沙李丽
Owner TAICANG PAIOU TECH CONSULTING SERVICE
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