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Chemical nitridation catalyst

A technology of infiltration catalyst and chemical infiltration, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems of workpiece rust, short duration of infiltration effect, etc., to save electricity, heat preservation, etc. Shortened time and good nitriding effect

Inactive Publication Date: 2012-09-26
远立贤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the above method has the effect of promoting infiltration, the phenomenon of furnace blockage is relatively serious, the duration of infiltration effect is relatively short, and the workpiece after nitriding is seriously rusted.

Method used

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Examples

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Effect test

Embodiment 1

[0013] Take 5% calcium carbonate, 25% sodium carbonate, 3% calcium oxide, 17% calcium chloride, 30% ammonium chloride, 5% rare earth carbonate, 15% rare earth chloride in proportion, and mix the above seven compounds evenly , put it into a section of stainless steel tube, plug the two ends with aluminum silicate fiber felt, and then spot weld the two ends on the stainless steel tube with stainless steel discs, and divide them into 200g and 300g packages. Put the workpiece and tooling into the bottom of a 100kw nitriding furnace, and keep warm at 560-580°C for 12 hours to compare the depth of the infiltrated layer, the structure and hardness of the infiltrated layer between the test block and the one without infiltrating agent. As a result, the depth of the infiltrated layer with the addition of the infiltration agent was significantly deeper than that without the infiltration agent, which was equivalent to the depth of the infiltration layer without the addition of the infiltra...

Embodiment 2

[0015] Take 10% calcium carbonate, 15% sodium carbonate, 5% calcium oxide, 15% calcium chloride, 35% ammonium chloride, 10% rare earth carbonate, 10% rare earth chloride in proportion, and mix the above seven compounds evenly , put it into a section of stainless steel tube, plug the two ends with aluminum silicate fiber felt, and then spot weld the two ends on the stainless steel tube with stainless steel discs, and divide them into 200g and 300g packages. Also put it into the bottom of a 100kw nitriding furnace along with the workpiece and tooling, and after 12 hours of heat preservation at 560-580°C, compare the infiltration layer depth, infiltration layer structure and hardness between the test block and the one without infiltration agent. As a result, the depth of the infiltration layer with the addition of the infiltration agent is also significantly deeper than that without the infiltration agent, which is equivalent to the depth of the infiltration layer without the addi...

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Abstract

The invention relates to a chemical nitridation catalyst which comprises the following components in proportion: 5 to 15 percent of calcium carbonate, 12 to 25 percent of sodium carbonate, 3 to 5 percent of calcium oxide, 10 to 30 percent of calcium chloride, 15 to 38 percent of ammonium chloride, 5 to 10 percent of rare earth carbonate and 10 to 15 percent of rare earth chloride. The seven compounds are uniformly mixed and put into a stainless steel pipe; two ends are plugged and locked by aluminium silicate fiber felts and spot-welded on the stainless steel pipe by stainless steel wafers; and the chemical nitridation catalyst is packaged every 200 grams and 300 grams. Discharged waste gas is reduced by about more than 52.5 kilograms, so that the environment is improved. The chemical nitridation catalyst is short in nitridation time and good in nitridation effect; electric energy is saved; a nitridation layer tissue is relatively thinned and dispersed; and the brittleness level, the nitride level and the looseness level can be well controlled.

Description

technical field [0001] The invention relates to a chemical nitriding and permeating agent. Background technique [0002] Nitriding is a common chemical heat treatment method for the surface of metal workpieces. At a certain temperature, active nitrogen atoms are infiltrated into the surface of metal workpieces to form a compound layer, which changes the phase structure of the surface of metal workpieces, thereby improving the mechanical properties of the surface of metal workpieces, corrosion resistance, Obtain good wear resistance, fatigue resistance. The patent application number 201110097678.2 published by the Patent Office of the State Intellectual Property Office is an invention patent for "Solid Rare Earth Nitriding Catalyst", which is composed of the following ingredients uniformly mixed by weight percentage, 50-90% of rare earth chloride, -30% and urea 5-20%. The rare earth permeation agent is a paste solid, packed in a wax-sealed paper box with a plastic film, and...

Claims

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Application Information

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IPC IPC(8): C23C8/24
Inventor 远立贤闫牧夫张志军郎大伟高臣蒋绍楼
Owner 远立贤
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