Simple method for chromizing small-axis parts and special chromizing agent thereof

A chromizing agent and chromizing technology, applied in the coating, metal material coating process, solid diffusion coating and other directions, can solve the problems of high cost of chromizing process, uneven chromizing layer, large equipment investment, etc. Avoid the effects of coarse grains, simple equipment and low market prices

Inactive Publication Date: 2004-09-15
许长荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing chromizing process has problems such as high cost, large investment in equipment, high chromizing temperature, and uneven chromizing layer. , a simple method for chromizing small shaft parts with obvious effects

Method used

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  • Simple method for chromizing small-axis parts and special chromizing agent thereof

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Embodiment 1

[0023] Chromizing treatment of small shaft parts with a diameter of φ2mm and a length of 9mm, the specific steps and process conditions are as follows:

[0024] (1) Stir the small shaft and the chromizing agent uniformly in a weight ratio of 1:2.75 and then put them into the chromizing tank 10 . (2) Mix the refractory mud with ordinary water glass, adjust it into a semi-thick shape, tightly seal the chromizing tank cover, evenly paste the gaps in the cover, and then put the tightly sealed chromizing tank into a high-temperature box-type resistance furnace, According to the size of the furnace, it can be evenly filled, and 3-5 chromizing tanks can be placed. Close the furnace door, and then seal the furnace door with aluminum silicate. (3) Sectional heating and heat preservation: heat up to 200°C and hold for 1 hour; heat up to 400°C and hold for 2 hours; heat up to 450°C and hold for 1 hour; heat up to 600°C and hold for 1 hour; heat up to 800°C ℃, holding time 1 hour. (4) C...

Embodiment 2

[0026] Carry out chromizing treatment to diameter φ 2.4mm, the small shaft part of length 6.25-11mm, its concrete steps are identical with embodiment 1, difference is:

[0027] The mixing ratio of the small shaft and the chromizing agent in step (1) is 1:2 by weight.

[0028] Chromizing treatment temperature and time in step (4): heating up from 800° C. to 920° C. and keeping the temperature for 11 hours to obtain a chromium carbide layer with a thickness of 7-18 μm.

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Abstract

The invention refers to a simple method for small shaft part chromizing, the method includes: (1) the small shaft part and chromizing agent are mixed even and put into the chromizing bottle; (2) seals the bottle and puts the bottle into electrical furnace and seals the furnace door tightly; (3) carries on segmented heating and thermal retardation; (4) chromizing process; (5) cooling; (6) opens the chromizing bottle, pours out the mixer, and takes out the small shaft piece, filters it and eliminates the chromizing agent; (7) hardening and tempering; the special chromizing agent is made up of aluminium oxide, chrome iron powder, ammonium chloride according to the proportion of 55%: 42%: 3%. The device in the invention is simple, low investment; small harm to device. It enhances the wearing resisting and corrosion resisting property of small shaft.

Description

technical field [0001] The invention relates to a simple method for chromizing small shaft parts, which is suitable for small shafts within the diameter range of φ1.5-φ12mm and the length range of 4-25mm, so it is especially suitable for the infiltration of chain pin shafts and bearing needle rollers. chromium. Background technique [0002] The method of chromizing on the surface of iron parts is a common method to improve the surface hardness of parts, increase the wear resistance and corrosion resistance of parts, and has been widely used by people. At present, the chromizing methods introduced in domestic and foreign literature reports and patented technologies generally have the following problems: 1. High cost and large investment in equipment; 2. The temperature range of chromizing is 950°C-1150°C. The metal matrix brings defects such as coarse grains and inter-lattice corrosion, and at the same time affects the quality of subsequent he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/40
Inventor 许长荣
Owner 许长荣
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