Pretreatment method of improving surface oxygen permeation capability of TC11 titanium alloy

A TC11, titanium alloy technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the influence of the mechanical properties of the matrix, the deterioration of the surface quality of the parts, the surface hardness of the oxygen permeation layer and the insufficient depth of the oxygen permeation layer. and other problems, to achieve the effect of increasing the surface hardness and the depth of the oxygen permeability layer, increasing the degree of hardening, and improving the oxygen permeability.

Active Publication Date: 2019-03-29
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] TC11 titanium alloy has excellent properties such as high melting point, high specific strength, low density, high fatigue performance and high corrosion resistance, but its application is limited due to the shortcomings of surface fatigue resistance, hardness, wear resistance and fretting wear performance. , in order to improve the surface hardness and wear resistance of the material, surface oxygen penetration treatment is generally used
However, under the oxygen infiltration process determined in the previous research, the surface hardness of the oxygen infiltration layer and the depth of the oxygen infiltration layer are often insufficient, which cannot meet the wear resistance requirements of the part surface
At present, in order to improve the oxygen permeation ability of the surface of TC11 titanium alloy, the existing technology can only adjust the oxygen permeation process, increase the oxygen permeation temperature and the holding time, but this method will cause the surface quality of the parts to decline, the phenomenon of oxide skin will appear, and may damage the The mechanical properties of the matrix have a certain influence

Method used

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  • Pretreatment method of improving surface oxygen permeation capability of TC11 titanium alloy
  • Pretreatment method of improving surface oxygen permeation capability of TC11 titanium alloy
  • Pretreatment method of improving surface oxygen permeation capability of TC11 titanium alloy

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Effect test

Embodiment 1

[0031] A pretreatment method for improving the oxygen permeation ability of the surface of TC11 titanium alloy is carried out according to the following steps:

[0032] (1) Inspection: process inspection of incoming parts;

[0033] (2) Cleaning: Clean up the parts with acetone and dry them;

[0034] (3) Vacuum pretreatment: Before heating, pump the pressure in the vacuum chamber to below 0.067Pa, 950°C / 60min, fill with 0.4MPa argon gas after heat preservation and cool down to below 80°C, and release from the furnace; Comparing the pretreated sample with the unpretreated sample, it was found that the α-phase content of the near-surface structure of the pretreated part was 50.9%, which was significantly higher than that of the unpretreated part (40.3 %)(See figure 1 ).

[0035] (4) Oxygen infiltration: use the corundum sand embedding method for oxygen infiltration, the oxygen infiltration process is: heating to 800 ° C for 10 hours, air cooling;

[0036] (5) Secondary anneal...

Embodiment 2

[0039] A pretreatment method for improving the oxygen permeation ability of the surface of TC11 titanium alloy is carried out according to the following steps:

[0040] (1) Inspection: process inspection of incoming parts;

[0041] (2) Cleaning: Clean up the parts with acetone and dry them;

[0042] (3) Vacuum pretreatment: Before heating, pump the pressure in the vacuum chamber to below 0.067Pa, 950°C / 65min, fill with 0.2MPa argon to cool;

[0043] (4) Machining: The machining margin of the oxygen permeated surface is controlled at no more than 0.3mm;

[0044] (5) Oxygen permeation: Oxygen permeation using corundum sand embedding method, oxygen permeation process: 800°C / 10h, air cooling;

[0045] (6) Secondary annealing: heat preservation at 530°C for 6h, air cooling;

[0046] (7) Inspection: use a microhardness tester to inspect the surface microhardness and hardening depth of the α-hardened layer. The surface hardness of the parts treated with oxygen is 690kg / mm 2 , Th...

Embodiment 3

[0048] A pretreatment method for improving the oxygen permeation ability of the surface of TC11 titanium alloy is carried out according to the following steps:

[0049] (1) Inspection: process inspection of incoming parts;

[0050] (2) Cleaning: Clean up the parts with acetone and dry them;

[0051] (3) Vacuum pretreatment: Before heating, the pressure in the vacuum chamber is pumped to below 0.067Pa, 950°C / 70min, filled with 0.3MPa argon to cool;

[0052](4) Machining: The machining margin of the oxygen permeated surface is controlled at no more than 0.5mm;

[0053] (5) Oxygen permeation: Oxygen permeation using corundum sand embedding method, oxygen permeation process: 800°C / 10h, air cooling;

[0054] (6) Secondary annealing: heat preservation at 530°C for 6h, air cooling;

[0055] (7) Inspection: use a microhardness tester to inspect the surface microhardness and hardening depth of the α-hardened layer. The surface hardness of the parts treated with oxygen is 630kg / mm ...

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Abstract

The invention provides a pretreatment method of improving surface oxygen permeation capability of a TC11 titanium alloy. The method is characterized in that on the premise that the parameters of an original mature oxygen permeation process are not changed, proper machining size control is adopted after proper preheating treatment and heat treatment are carried out, so that the oxygen permeation capability of the TC11 titanium alloy is improved, the surface hardness and the depth of an oxygen permeation layer of the TC11 titanium alloy part are remarkably improved, so that the requirement for the wear resistance of the surface of the part is better met.

Description

technical field [0001] The invention belongs to the technical field of surface protection, and particularly provides a pretreatment method for improving the oxygen penetration ability of the surface of TC11 titanium alloy. Background technique [0002] TC11 titanium alloy has excellent properties such as high melting point, high specific strength, low density, high fatigue performance and high corrosion resistance, but its application is limited due to the shortcomings of surface fatigue resistance, hardness, wear resistance and fretting wear performance. , in order to improve the surface hardness and wear resistance of the material, surface oxygen penetration treatment is generally used. However, under the oxygen infiltration process determined in the previous study, the surface hardness and depth of the oxygen infiltration layer are often insufficient, which cannot meet the wear resistance requirements of the part surface. At present, in order to improve the oxygen permea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/10C23C8/02C23C8/80C22C14/00C22F1/18
CPCC22C14/00C22F1/183C23C8/02C23C8/10C23C8/80
Inventor 王哲王蔓施国梅张凡云王蕊
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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