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Boron carbon nitrogen trielement coexudation method

A boron-carbon-nitrogen ternary and carbon-nitrogen ternary technology, which is applied in the field of chemical heat treatment of metal surfaces, can solve the problems of dimensional deformation of the infiltrated workpiece, complicated process and high toxicity, and achieves small deformation of the workpiece and simple equipment and process. , easy-to-control effects

Inactive Publication Date: 2003-09-17
杨玉林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Metal surfaces often undergo surface chemical heat treatment to improve their surface physical and chemical properties. Surface boronizing is a chemical heat treatment for metal surface strengthening. Usually, there are three infiltration processes: solid phase, liquid phase and gas phase. Gas phase boronizing The process, like other elements, is superior to solid-phase and liquid-phase methods in terms of production efficiency, working conditions and product quality, but so far, gas-phase boronizing agents use hydrogen as a carrier, and diborane (B 2 h 6 ) as a raw material, so technically it has not yet broken through the insurmountable shortcomings of being explosive, highly toxic, etc., so special equipment must be provided, and the process is complicated; This will cause the dimensional deformation of the workpiece to be infiltrated, so high-temperature boriding is difficult to achieve for tools, molds and some wear-resistant parts that require high dimensional accuracy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Most of the driven discs and shock absorbing discs in automobile clutches are stamped and formed with 08F materials. Take DSΦ350 as an example: the effective size is Φ300×3.2mm, and the boronizing agent is calculated by weight percentage, consisting of 2% La rare earth chloride and 10% boron carbide. , Potassium fluoroborate 15%, binder carboxymethyl cellulose 2%, and silicon carbide the rest. It is prepared by hydrolyzing the above components, mixing them uniformly, and drying at 200°C to form a block with a particle size of 15mm.

[0017] 1. Heat treatment tooling conditions

[0018] RJQ-105-9 well-type gas carburizing furnace is adopted, with radial combined molds, and the workpieces are hung vertically, 240 pieces per furnace, and 200-240 pieces on the beam.

[0019] 2. Heat treatment process

[0020] like figure 1 The shown boron, carbon and nitrogen ternary co-infiltration device adopts well-type gas carburizing furnace. Open and place, place in the infiltratin...

Embodiment 2

[0029] The difference from Example 1 is:

[0030] 40Cr steel is used as the base material, and boron, carbon, and nitrogen three-component co-infiltration are carried out on the surface. The boronizing agent is calculated by weight percentage, and its chemical composition is Ce chloride rare earth 3%, boron carbide 12%, potassium fluoroborate 20%, The binder starch is 3%, and the remainder of silicon carbide is prepared by hydrolyzing the above-mentioned components, mixing them uniformly, drying them at 300°C into lumps, and the particle size is 10mm; Formamide dripping speed is 4 ml / min, co-infiltration temperature is 880°C, co-infiltration time is 100 minutes, oil cooling; dosage of penetrating agent is 500 grams, infiltration speed is 0.2mm / hour, infiltration layer thickness is 0.33mm, microhardness HV 0.490 1100.

[0031] The commonly used mold material is Cr12MoV, and its cost is about 17,000 yuan / ton, and it is easy to be brittle. The co-infiltration 40Cr steel of the ...

Embodiment 3

[0033] The difference from Example 1 is:

[0034] 20 steel is used as the base material, and boron, carbon and nitrogen ternary co-infiltration are carried out on its surface. The boronizing agent is calculated by weight percentage, and its chemical composition is Ce chloride rare earth 1.5%, boron carbide 5%, potassium fluoroborate 10%, The binder dextrin is 1%, and the rest of silicon carbide is prepared by hydrolyzing the above-mentioned components, mixing them uniformly, and drying at 150°C to form a block with a particle size of 20mm.

[0035] The dropping speed of acetone is 10 ml / min, and the dropping speed of dimethylformamide is 6 ml / min; the total infiltration temperature is 780°C, the total infiltration time is 120 minutes, water cooling; the amount of infiltration agent is 450 grams, and the infiltration speed is 0.15mm / hours, the thickness of the infiltrated layer is 0.3mm, and the microhardness is HV 0.490 1050.

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Abstract

A three-element (B, C and N) co-osmosizing process for metal surface includes such steps as loading the solid boronizing agent in carburizing furnace but isolating from the workpiece, dropping the co-osmosizing C-N liquid in the carburizing furnace, co-osmosizing at 780-880 deg.c and 0.15-0.2 mm / hr of speed, and cooling in oil or water. Its advantages are low co-osmosizing temp and quenching temp. less deformation of workpiece, and high effect on improving performance of workpiece.

Description

technical field [0001] The invention relates to the technical field of metal surface chemical heat treatment, in particular to a three-component co-infiltration method of boron, carbon and nitrogen. Background technique [0002] Metal surfaces often undergo surface chemical heat treatment to improve their surface physical and chemical properties. Surface boronizing is a chemical heat treatment for metal surface strengthening. Usually, there are three infiltration processes: solid phase, liquid phase and gas phase. Gas phase boronizing The process, like other elements, is superior to solid-phase and liquid-phase methods in terms of production efficiency, working conditions and product quality, but so far, gas-phase boronizing agents use hydrogen as a carrier, and diborane (B 2 h 6 ) as a raw material, so technically it has not yet broken through the insurmountable shortcomings of being explosive, highly toxic, etc., so special equipment must be provided, and the process is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/00C23C8/30C23C8/68
Inventor 杨玉林
Owner 杨玉林
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