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Lanthanum-doped molybdenum alloy wire for thermal spraying and preparation method thereof

A technology of alloy wire and thermal spraying, which is applied in coating, fusion spraying, metal material coating process, etc., can solve the problems of high temperature strength, hardness and oxidation resistance, etc., and achieve easy control of the production process, good High temperature strength, uniform distribution effect

Inactive Publication Date: 2012-09-12
金堆城钼业光明(山东)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, pure molybdenum wire and pure molybdenum powder are used as thermal spraying materials at home and abroad, and their high temperature strength, hardness and oxidation resistance are not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation of lanthanum nitrate aqueous solution, lanthanum nitrate is chemically pure, the lanthanum content is 31.5%, according to the weight ratio of lanthanum nitrate: pure water = 1:3, fully stirred, dissolved evenly, can get lanthanum nitrate aqueous solution.

[0017] Doped according to 0.1% La weight ratio, 318g of lanthanum nitrate (La content 31.5%) was dissolved in pure water, sprayed into 133.3kg of molybdenum dioxide powder, mixed evenly, and then hydrogen gas in the furnace at 800-1000°C Reduction to obtain 100 kg of molybdenum powder doped with a La content of 0.1%. Put the doped molybdenum powder into the rubber sleeve and press it into a round molybdenum rod with an isostatic press under a pressure of 160-200Mpa, and then sinter at a high temperature of 1900°C in an intermediate frequency sintering furnace to obtain a molybdenum rod containing 0.2% La. After rolling, swaging and drawing, it is processed into lanthanum-molybdenum wire with a diamete...

Embodiment 2

[0019] The preparation of lanthanum nitrate aqueous solution is the same as example 1.

[0020] Dope at 0.4% by weight of La, dissolve 1270g of lanthanum nitrate (La content 31.5%) in pure water, add it into 133.3kg of molybdenum dioxide powder by spraying, mix well, and then put it in a furnace at 800-1000℃ Reduction with hydrogen gas obtained 100 kg of molybdenum powder doped with rare earth oxide La content of 0.4%. Fill the doped molybdenum powder into the rubber sleeve and press it into a round molybdenum rod with an isostatic press under a pressure of 160-200Mpa, and then sinter at a high temperature of 1900°C in an intermediate frequency sintering furnace to obtain a molybdenum rod containing 0.5% La. After rolling, swaging and drawing, it is processed into lanthanum-molybdenum wire with a diameter of 3.17mm.

Embodiment 3

[0022] The preparation of the rare earth lanthanum nitrate aqueous solution is the same as Example 1.

[0023] Dope at 0.8% by weight of La, dissolve 2540g of lanthanum nitrate (La content 31.5%) in pure water, add it to 133.3kg of molybdenum dioxide powder by spraying, mix well, and then put it in a furnace at 800-1000℃ Reduction with hydrogen gas obtained 100 kg of molybdenum powder doped with a rare earth oxide La content of 0.8%. Put the doped molybdenum powder into the rubber sleeve and press it into a round molybdenum rod with an isostatic press under a pressure of 160-200Mpa, and then sinter at a high temperature of 1900°C in an intermediate frequency sintering furnace to obtain a molybdenum rod containing 0.8% La. After rolling, swaging and drawing, it is processed into lanthanum-molybdenum wire with a diameter of 3.17mm.

[0024] When the La content exceeds 0.8%, the pressure processing performance of the molybdenum wire will deteriorate, which will affect the qualit...

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PUM

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Abstract

The invention relates to a lanthanum-doped molybdenum alloy wire for thermal spraying and a preparation method thereof, and is characterized in that La2O3 is contained in the lanthanum-doped molybdenum alloy wire, and the weight content is as follows: 0.1-0.8 percent of La, and the balance of Mo and inevitable impurities. The lanthanum-doped molybdenum alloy wire for thermal spraying has better high temperature strength, hardness and oxidation resistance, and is more advantageous compared with pure molybdenum wires, thereby being expected to be the substitute of pure molybdenum wires in the aspect of thermal spraying. No harm is generated to the body of an operator during preparation; the production process is easy to control, the operation is simple and convenient, safe and reliable, vast investment and transformation on equipment is not needed, and the lanthanum-doped molybdenum alloy wire is applicable to production in large scale; as a liquid-solid doping method is adopted, the added alloy elements are uniformly distributed in the material, and the production consistency is good; and as the pressure machining processes of rolling, rotary swaging and drawing are adopted, the product loss is low and the recovery rate is high.

Description

technical field [0001] A lanthanum-molybdenum-doped alloy wire for thermal spraying and a preparation method thereof, relating to an application in high temperature resistance, wear resistance, and impact resistance, such as automobile gearbox gears, engine piston rings, synchronous rings, and surface spraying of cylinder blocks. Lanthanum-doped molybdenum alloy wire for thermal spraying. Background technique [0002] Thermal spraying is the use of some kind of heat source (such as electric arc, plasma, combustion flame, etc.) to heat the filamentous metal material to a molten or semi-molten state, and then spray it onto the surface of the pretreated substrate at a certain speed with the help of compressed air, and deposit it. A technology of surface coating with various functions. [0003] At present, pure molybdenum wire and pure molybdenum powder are used as thermal spraying materials at home and abroad, but their high temperature strength, hardness and oxidation resista...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/05C23C4/06C22F1/18
Inventor 李世伟孟庆乐黄立峰栾浩
Owner 金堆城钼业光明(山东)股份有限公司
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