Low-temperature surface nitriding method of titanium alloy

A titanium alloy and nitriding technology, which is applied to the surface treatment of titanium alloys and the field of low-temperature surface nitriding of titanium alloys, can solve problems that are rarely mentioned, and achieve the effects of enhanced wear resistance, simple process, and cost-effective

Active Publication Date: 2013-03-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the materials corresponding to the chemical heat treatment method of low-temperature nitriding are stainless steel, IF steel, low-carbon steel, and medium-carbon steel. Titanium alloy low-temperature surface nitriding is rarely mentioned at home and abroad.

Method used

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  • Low-temperature surface nitriding method of titanium alloy
  • Low-temperature surface nitriding method of titanium alloy
  • Low-temperature surface nitriding method of titanium alloy

Examples

Experimental program
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preparation example Construction

[0047] 2. Preparation of nitriding reagent

[0048] The mixture of white powder crystal sodium cyanate (NaCNO) and white square granular crystal potassium cyanate (KCNO) (the mixing ratio of sodium cyanate (NaCNO) and potassium cyanate (KCNO) is (0.8~1) by mass: 1) with rare earth CeO 2 (particle size ≤ 200 mesh) powder is put into a ball mill and stirred for 15-20 minutes to obtain a nitriding reagent; the mass percentage of the mixture of sodium cyanate and potassium cyanate in the reagent is 80-98%, rare earth cerium oxide (CeO 2 ) The mass percentage is 2%~20%.

[0049] 3. Surface chemical heat treatment

[0050] First put part of the nitriding reagent into the pre-prepared corundum crucible for compaction, and then center and flatly place the surface-treated titanium alloy sample on the compacted nitriding reagent (the bottom of the crucible is supported by a 3-point support method). The sample is supported, arranged in an equilateral triangle, the distance from the su...

example 1

[0052] Step 1. Surface treatment of titanium alloy samples

[0053] 1) Sandblasting

[0054] White corundum (Al 2 o 3 ) (SiO 2 or SiC) sand particles to sandblast the titanium alloy surface, the working pressure is 0.5MPa, and the sandblasting time is 15 minutes.

[0055] 2) grinding

[0056] Put the titanium alloy sample after sandblasting in a low-temperature ultra-clean polishing machine, using Al 2 o 3 (Abrasive particle size is 20μm) Consolidated grinding and polishing pad (grinding pressure is 0.05MPa, eccentricity is 60mm, rotation speed is 120rpm, grinding time is 15 minutes), for rough grinding; after that, use Al 2 o 3 (Abrasive particle size is 14 μm) Consolidated grinding and polishing pad (grinding pressure is 0.025, eccentricity is 60mm, rotation speed is 180rpm, grinding time is 20 minutes) for fine grinding treatment.

[0057] 3) Polishing and cleaning

[0058] Put the ground titanium alloy sample in a low-temperature ultra-clean polishing machine, an...

example 2

[0065] Step 1. Surface treatment of titanium alloy samples

[0066] 1) Sandblasting

[0067] White corundum (Al 2 o 3 ) sand to blast the surface of the titanium alloy, the working pressure is 0.3MPa, and the blasting time is 10 minutes.

[0068] 2) grinding

[0069] Put the titanium alloy sample after sandblasting in a low-temperature ultra-clean polishing machine, using Al 2 o 3 (Abrasive particle size is 28μm) Consolidated grinding and polishing pad (grinding pressure is 0.075MPa, eccentricity is 70mm, rotation speed is 100rpm, grinding time is 15 minutes), for rough grinding; after that, use Al 2 o 3 (Abrasive particle size is 10 μm) Consolidated grinding and polishing pad (grinding pressure is 0.05, eccentricity is 70mm, rotation speed is 150rpm, grinding time is 30 minutes) for fine grinding treatment.

[0070] 3) Polishing and cleaning

[0071] Put the ground titanium alloy sample in a low-temperature ultra-clean polishing machine, and use a rare earth cerium ox...

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Abstract

The invention discloses a low-temperature surface nitriding method of a titanium alloy, and belongs to the technical field of metal surface heat treatment and modification. The low-temperature surface nitriding method is characterized by comprising the following steps of: firstly, carrying out sand blasting cleaning on the surface of the titanium alloy, then carrying out chemical mechanical lapping and polishing, then mixing powder crystal sodium cyanate (NaCNO) and granular crystal potassium cyanate (KCNO) and rare earth CeO2 powder in a certain proportion so as to obtain a nitriding reagent, placing the nitriding reagent and the treated titanium alloy in a crucible for compacting and sealing, then drying, and placing the crucible in a high-temperature furnace for heating, wherein NaCNO and KCNO are used as nitriding sources, and rare earth CeO2 is used as a catalyst. According to the low-temperature surface nitriding method, a TiN 0.3-1 nitriding layer is formed on the surface of the titanium alloy TC21, the friction coefficient of the surface of the titanium alloy is remarkably reduced, the surface hardness is increased, and the surface property is enhanced.

Description

technical field [0001] The invention relates to a material surface treatment method, in particular to a titanium alloy surface treatment method, in particular to a titanium alloy low-temperature surface nitriding method. Background technique [0002] Titanium alloy has outstanding advantages such as high specific strength and excellent corrosion resistance, and is the most promising lightweight material to replace alloy steel in manufacturing transmission mechanism functional components. For example, titanium alloy TC21 is an α+β-type titanium alloy developed by my country with independent intellectual property rights. It has high strength (R m ≥1100MPa), high toughness (K IC ≥70MPa ), high damage tolerance (lower fatigue crack growth rate da / dN value and higher fatigue crack growth threshold ΔK th ) and excellent fatigue resistance (better than ordinary TC4, TA15 and other medium-strength titanium alloys) and other comprehensive properties match. It is equivalent to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/62
Inventor 朱延松卢文壮王晗胥军左敦稳何亚峰孙玉利艾国平蔡文俊徐锋
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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