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Low-temperature carbonitriding catalyst and carbonitriding method thereof

A technology of carbonitriding and process method is applied in the field of iron and steel metallurgy treatment, and achieves the effects of low preparation temperature, saving industrialized production, and easy control of process conditions

Inactive Publication Date: 2012-10-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon has led to the neglect of the development and popularization of low-temperature chemical heat treatment catalysts. The catalytic effect of catalysts that have been developed and applied at present needs to be above 750°C to be obvious.

Method used

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  • Low-temperature carbonitriding catalyst and carbonitriding method thereof
  • Low-temperature carbonitriding catalyst and carbonitriding method thereof
  • Low-temperature carbonitriding catalyst and carbonitriding method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040]Using ammonium chloride, sponge titanium, rare earth, solid chromate, aluminum powder and quartz sand as raw materials, weigh each raw material in proportion, grind and mix them uniformly to form a catalyst, wherein the catalyst includes 10.6% by weight of chlorine ammonium chloride, 1.8% titanium sponge, 9% rare earth, 0.1% solid chromate, 0.01% aluminum powder, and the rest of the catalyst is quartz sand.

[0041] Mix the catalyst evenly and put it in a stainless steel container with the cleaned 3Cr2W8V steel test workpiece according to the specific gravity of 250:1 and put them into the bottom of the carburizing furnace for composite co-carburizing. It is carried out in the furnace, and the temperature control device is an electronic potentiometer. The test temperature is 500°C, and the test time is (2-8) h. The osmotic agent is [(NH2)2CO+C2H5OH] saturated solution + kerosene, and the amount of osmotic agent added is (70-80) drops / min. Finally, the product was coole...

Embodiment 2

[0047] Using ammonium chloride, sponge titanium, rare earth, solid chromate, aluminum powder and quartz sand as raw materials, weigh each raw material in proportion, grind and mix them uniformly to form a catalyst, wherein the catalyst includes 12% by weight of chlorine ammonium chloride, 2.5% titanium sponge, 10% rare earth, 1% solid chromate, 0.015% aluminum powder, and the rest of the catalyst is quartz sand.

[0048] Mix the catalyst evenly and put it in a stainless steel container with the cleaned 3Cr2W8V steel test workpiece according to the specific gravity of 250:1 and put them into the bottom of the carburizing furnace for composite co-carburizing. It is carried out in the furnace, and the temperature control device is an electronic potentiometer. The test temperature is 500-600°C, and the co-infiltration time is 4 hours. The osmotic agent is [(NH2)2CO+C2H5OH] saturated solution + kerosene, and the amount of osmotic agent added is (70-80) drops / min. Finally, the pro...

Embodiment 3

[0053] Using ammonium chloride, sponge titanium, rare earth, solid chromate, aluminum powder and quartz sand as raw materials, weigh each raw material in proportion, grind and mix them uniformly to form a catalyst, wherein the catalyst includes 10.6% by weight of chlorine ammonium chloride, 1.8% titanium sponge, 9% rare earth, 0.1% solid chromate, 0.01% aluminum powder, and the rest of the catalyst is quartz sand.

[0054] Mix the catalyst evenly and put it in a stainless steel container with the cleaned 20CrMnTi test workpiece according to the specific gravity of 250:1 and put it into the bottom of the carburizing furnace for composite co-carburizing. The temperature control device is an electronic potentiometer. The test temperature is 540°C, and the co-infiltration time is 4 hours. The osmotic agent is [(NH2)2CO+C2H5OH] saturated solution + kerosene, and the amount of osmotic agent added is (70-80) drops / min. Finally, the product was cooled to room temperature to complete...

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Abstract

The invention provides a low-temperature catalyst and a carbonitriding method thereof. The catalyst comprises the following components in percent by weight: 10-15 percent of ammonium chloride, 1-5 percent of titanium sponge, 8-13 percent of rare earth, 0.1-2.5 percent of solid chromate, 0.01-1.5 percent of aluminum powder and the balance of quartz sand. The carbonitriding method comprises the following steps of: weighting the ammonium chloride, the titanium sponge, the rare earth, the solid chromate, the aluminum powder and the quartz sand as raw materials, grinding and mixing uniformly to form the catalyst; and mixing a cleaned workpiece with the catalyst uniformly and then charging into a furnace together for compound nitriding. The low-temperature catalyst and the carbonitriding methodthereof are used for carrying out compound nitriding on a carbonitriding process by adopting the catalyst, and further improve surface hardness, wear resistance and corrosion resistance of a workpiece while reducing carbonitriding temperature and shortening carbonitriding time.

Description

【Technical field】 [0001] The invention relates to the technical field of iron and steel metallurgical treatment, in particular to a low-temperature carbonitriding catalyst and a co-infiltration process method thereof. 【Background technique】 [0002] Chemical catalytic infiltration and co-infiltration in chemical heat treatment is the most commonly used process in the field of industrial production, and more than 80% of heat-treated parts (weight) need co-infiltration treatment. Gas carburizing and carbonitriding (nitrocarburizing) with controlled atmosphere are the main means of mass production of automobiles, standard parts, bearings, and construction machinery parts. Its application scope involves molds, precision machinery, aerospace, military, Metallurgy, instrumentation, light industry, railway, textile, shipbuilding, automobile, petroleum, medical equipment, electronics, energy and special material (or parts) processing and so on. In recent years, research on various ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C23C8/32
Inventor 许晓嫦
Owner CENT SOUTH UNIV
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