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Novel low-temperature rare earth-chromium-boronizing agent

A technology of co-penetrating agent and rare earth, applied in metal material coating process, coating, solid diffusion coating, etc., can solve the problems of heavy pollution, large gas volume, long time, etc., and achieve wide application fields and small deformation of workpieces. , the effect of no internal stress

Inactive Publication Date: 2013-10-09
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, solid boronizing is mainly high-temperature boronizing (850 ° C ~ 950 ° C), which has obvious disadvantages: high boronizing temperature, long time, large deformation of workpiece after heat treatment; boronizing layer is brittle and not firmly bonded to the substrate. Easy to peel off; in view of the above shortcomings of high-temperature boronizing, in order to reduce costs, reduce workpiece deformation, and broaden the wide application of boronizing technology, at present, domestic and foreign scholars and experts are mainly changing the composition of the infiltrating agent, lowering the treatment temperature, and adopting different boronizing processes. and pre-infiltration and post-infiltration treatment processes have been studied, among which the research on low-temperature multi-component boronizing is relatively mature
However, the co-infiltration layer is shallow, the cost is high, and the application field is limited
At the same time, the borax disclosed in this patent requires dehydration of industrial borax before it can be used, and the cost is high; the graphite is light, and the pollution is heavy; the amount of gas is large during the co-infiltration of sodium fluorosilicate, which affects the co-infiltration layer Binding to the matrix

Method used

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  • Novel low-temperature rare earth-chromium-boronizing agent
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  • Novel low-temperature rare earth-chromium-boronizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: A new type of boron-chromium-rare earth low-temperature co-infiltration agent, the content of the co-infiltration agent components is: 4.8 parts of high-carbon ferrochrome, 3.8 parts of rare earth, 6.8 parts of potassium fluoroborate, and 21.3 parts of aluminum oxide , 5.9 parts of thiourea, 53.0 parts of ferroboron.

[0028] No. 20 steel sample was quenched before infiltration, and then co-infiltrated with boron-chromium-rare earth at 600℃×6h, and observed and tested the sample after infiltration. The process is as follows:

[0029] 1. Carry out pre-infiltration quenching treatment on the workpiece

[0030] The workpiece is quenched at 900°C, the holding time is 15 minutes, and then water quenched.

[0031] 2. Co-infiltration agent preparation

[0032] The penetrating agent is a boron-iron type co-penetrating agent with the above ratio, and its preparation process is as follows:

[0033] a. Grinding ferroboron, high-carbon ferrochrome, rare earth and alu...

Embodiment 2

[0041] Example 2: A new type of boron-chromium-rare earth low-temperature co-infiltration agent, the content of the co-infiltration agent components is: 4.9 parts of high-carbon ferrochrome, 3.9 parts of rare earth, 7.0 parts of potassium fluoroborate, and 23.5 parts of aluminum oxide , 7.2 parts of thiourea, 53.5 parts of boron iron.

[0042]No. 20 steel sample was quenched before infiltration, and then co-infiltrated with boron-chromium-rare earth at 600℃×6h, and observed and tested the sample after infiltration. The process is as follows:

[0043] 1. Carry out pre-infiltration quenching treatment on the workpiece

[0044] The workpiece is quenched at 900°C, holding time is 20 minutes, and quenched in water.

[0045] 2. Co-infiltration agent preparation

[0046] The penetrating agent is a boron-iron type co-penetrating agent with the above ratio, and its preparation process is as follows:

[0047] a. Grinding ferroboron, high-carbon ferrochrome, rare earth and aluminum o...

Embodiment 3

[0055] Example 3: A new type of boron-chromium-rare earth low-temperature co-infiltration agent, the content of the co-infiltration agent components is: 4.9 parts of high-carbon ferrochrome, 3.9 parts of rare earth, 8.2 parts of potassium fluoroborate, and 22.2 parts of aluminum oxide , 7.0 parts of thiourea, 53.8 parts of boron iron.

[0056] No. 45 steel sample was quenched before infiltration, and then co-infiltrated with boron-chromium-rare earth at 600°C×6h, and the sample was observed and tested after infiltration. The process is as follows:

[0057] 1. Carry out pre-infiltration quenching treatment on the workpiece

[0058] The workpiece is quenched at 860°C, the holding time is 20 minutes, and then water quenched.

[0059] 2. Co-infiltration agent preparation

[0060] The penetrating agent is a boron-iron type co-penetrating agent with the above ratio, and its preparation process is as follows:

[0061] a. Grinding ferroboron, high carbon ferrochrome, rare earth an...

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Abstract

The invention discloses a novel low-temperature boron-chromium-rare earth co-permeation agent which comprises the following components in parts by content: 4.8 to 5.0 parts of high-carbon ferrochrome, 3.8 to 4.0 parts of rare earth, 6.8 to 8.4 parts of potassium fluoborate, 21.3 to 24.5 parts of aluminium oxide, 5.9 to 7.6 parts of thiourea and 53.0 to 54.5 parts of ferroboron. The co-permeation agent has the advantages that 1) a workpiece is deformed slightly and cannot generate phase-change and internal stress after being subjected to co-permeation, so that the application of the co-permeation agent on a precise part is promoted greatly; 2) a low-temperature co-permeation layer is thicker and ranges from 30 mu m to 52 mu m or so, so that the application range is wide; and 3) the cost of the low-temperature co-permeation of the boron-chromium-rare earth is lower, so that the good economical effect is obtained.

Description

technical field [0001] The invention relates to a low-temperature co-penetration agent, in particular to a novel boron-chromium-rare earth low-temperature co-penetration agent. Background technique [0002] Boronizing is a thermochemical surface strengthening technique in which boron atoms diffuse to the metal surface to form metal borides. The boronizing layer has the excellent characteristics of high hardness, corrosion resistance, wear resistance and high temperature oxidation resistance, so it is widely used in various materials, including non-ferrous metals, ferrous metals and various alloys. [0003] At present, solid boronizing is mainly high-temperature boronizing (850°C-950°C), which has obvious disadvantages: high boronizing temperature, long time, large deformation of workpiece after heat treatment; boronizing layer is brittle and not firmly bonded to the substrate. Easy to peel off; in view of the above shortcomings of high-temperature boronizing, in order to re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/02
Inventor 许斌袁兴栋王豪蔡玉成
Owner SHANDONG JIANZHU UNIV
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