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Titanium alloy segmented vacuum rapid nitriding method and device

A vacuum fast, titanium alloy technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of high brittleness, long processing time, and thin permeation layer, so as to improve performance and guarantee The effect of continuity

Pending Publication Date: 2020-10-30
GUIZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing titanium alloy gas nitriding technology has disadvantages such as long processing time, thin layer and high brittleness of the layer, which cannot meet the needs of actual use.

Method used

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  • Titanium alloy segmented vacuum rapid nitriding method and device
  • Titanium alloy segmented vacuum rapid nitriding method and device
  • Titanium alloy segmented vacuum rapid nitriding method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) After polishing and cleaning the TC4 titanium alloy sample, put it into the reaction tank, and pass high-purity nitrogen gas with a purity ≥ 99.99% into the reaction tank until all the air in the tank is exhausted;

[0039] 2) Press figure 1 Process curve shown, the reaction tank is evacuated to 10 -3 Pa, then the temperature of the reaction tank was raised to 780°C, and kept for 0.5h;

[0040] 3) Press figure 1According to the process curve shown, the high-purity nitrogen gas is introduced into the reaction tank until the pressure in the tank reaches 60000Pa, then the temperature of the reaction tank is raised to 800°C, and the temperature is kept; the nitrogen is extracted until the pressure in the tank is reduced to 5000Pa, and the temperature is kept; react again Inject high-purity nitrogen into the tank until the pressure in the tank reaches 60,000Pa, and keep warm; carry out 8 cycles of nitriding according to the pressure alternating cycle of high pressure-lo...

Embodiment 2

[0043] Each step is with embodiment 1, wherein:

[0044] In step 2), the vacuum degree of the reaction tank is 10 -4 Pa, the temperature is 750°C, and the holding time is 1h;

[0045] In step 3), the high pressure in the tank is 30000Pa, the nitriding temperature is 900°C, the low pressure in the tank is 15000Pa, the nitriding cycle is performed twice, and the total time of the nitriding cycle is 1h; the high-pressure holding time of each cycle nitriding, The low pressure holding time is 15min.

[0046] In step 4), the vacuum diffused for 1h and the vacuum degree was 10 -4 Pa.

Embodiment 3

[0048] Each step is with embodiment 1, wherein:

[0049] In step 2), the vacuum degree of the reaction tank is 10 -4 Pa, the temperature is 765°C, and the holding time is 0.7h;

[0050] In step 3), the high pressure in the tank is 50000Pa, the nitriding temperature is 850°C, the low pressure in the tank is 10000Pa, the nitriding cycle is 9 times, and the total time of the nitriding cycle is 6h; the high-pressure holding time of each cycle nitriding, The low pressure holding time is 20min.

[0051] In step 4), the vacuum diffuses for 4 hours and the vacuum degree is 10 -3 Pa.

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Abstract

The invention discloses a titanium alloy segmented vacuum rapid nitriding method and device, and belongs to a metal heat treatment method and device. The method comprises the following steps of placing a workpiece in a reaction tank with air exhausted, carrying out vacuum preheating treatment, heating to a nitriding temperature, and then performing nitriding according to a pressure alternating cycle, and then carrying out vacuum diffusion for certain time. The device comprises a heating system, a vacuum system and a gas supply system. The heating system is composed of a reaction tank (4) fixedin a furnace body (1), an electric heating element (2) located between the reaction tank and a combustion chamber, a thermocouple (3) extending into the combustion chamber,, and a furnace door (9) sealing a tank opening, the vacuum system is composed of a sucking pump (12) in communication with the reaction tank (4), and the gas supply system is composed of a nitrogen bottom (1) in communicationwith the reaction tank (4) through a gas inlet pipe (5). The method can accelerate a nitriding speed, promote diffusion of nitrogen into a matrix and form a gradient nitrided layer, and improve brittleness of a nitrogen layer. The method and device are a method and device for processing metal surfaces.

Description

technical field [0001] The invention relates to a titanium alloy nitriding method, in particular to a titanium alloy segmental vacuum rapid nitriding method; the invention also relates to a heat treatment device for realizing the method. It belongs to metal surface treatment and device. Background technique [0002] Titanium alloy has the advantages of high specific strength, good corrosion resistance, high temperature resistance and good biocompatibility, and is widely used in aerospace, shipbuilding, machinery, petrochemical and biological engineering and other fields. However, the surface hardness of titanium alloy is not high, and it is not wear-resistant and has poor fatigue resistance, so its application range is greatly limited. Among all alloying elements, nitrogen is the element that most affects the hardness of titanium. Titanium nitride has the advantages of high hardness, excellent chemical stability, low friction coefficient, excellent biocompatibility and good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/24C23C8/02
CPCC23C8/02C23C8/24
Inventor 杨闯雷伦福王正芹高雨琪吴什二潘文美赵应飞刘选文张茂
Owner GUIZHOU NORMAL UNIVERSITY
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