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Boron-chromium-rare-earth co-seeping agent and its low-temperature co-seeping process below eutectoid line

A technology of co-infiltration agent and rare earth, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of high brittleness, unsuitability for precision parts application, large deformation, etc., and achieve small brittleness and small deformation , to reduce the effect of segregation on grain boundaries

Inactive Publication Date: 2008-09-17
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the temperature range of 840-860 ℃, the deformation of the workpiece after co-infiltration cooling is large, so it is not suitable for application on precision parts
At the same time, due to the co-infiltration of the workpiece in this temperature range, FeB and Fe are obtained. 2 B composite layer, relatively single Fe 2 For the B infiltration layer, its brittleness is greater

Method used

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  • Boron-chromium-rare-earth co-seeping agent and its low-temperature co-seeping process below eutectoid line
  • Boron-chromium-rare-earth co-seeping agent and its low-temperature co-seeping process below eutectoid line
  • Boron-chromium-rare-earth co-seeping agent and its low-temperature co-seeping process below eutectoid line

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: A boron-chromium-rare earth co-penetration agent, including the following components by weight, 6.1 parts of high-carbon ferrochromium, 5 parts of rare earth chloride, 15.5 parts of sodium fluorosilicate, 11 parts of silicon-calcium alloy, 23 parts of borax 35 parts of graphite, 1.8 parts of urea, and 1 part of ammonium chloride.

[0031] No. 20 steel sample was shot peened for 1 hour, and then boron-chromium-rare earth co-infiltration was carried out under the condition of 680°C×4h, and the sample was observed and tested after infiltration. The process is as follows:

[0032] 1. Shot blasting the workpiece

[0033] A Q3110A shot blasting machine is used, and the shot blasting time is 60 minutes. The steel shots are cast steel balls with a diameter of 1.4mm, and the linear velocity of the steel balls is 70m / s.

[0034] 2. Co-infiltration agent preparation

[0035] Copenetration agent is through L 18 (6 1 ×3 6 ) L 8 (4 1 ×2 4 ) pan-selected and sel...

Embodiment 2

[0043] Embodiment 2: A kind of boron-chromium-rare earth co-infiltration agent, comprises the composition of following weight ratio, high-carbon ferrochrome 6.2 parts, rare earth chloride 6 parts, sodium fluorosilicate 16 parts, silicon-calcium alloy 11.5 parts, borax 23.5 parts 35.5 parts of graphite, 2 parts of urea, and 1.05 parts of ammonium chloride.

[0044] Shot peen No. 20 steel sample for 1.5 hours, and then carry out boron-chromium-rare earth co-infiltration under the condition of 680℃×4h. The process is as follows:

[0045] 1. Shot blasting the workpiece

[0046] The Q3110A shot blasting machine is adopted, and the shot blasting time is 90 minutes. The steel shots are cast steel balls with a diameter of 1.4mm, and the linear speed of the steel balls is 50m / s;

[0047] 2. Co-infiltration agent preparation

[0048] Copenetration agent is through L 18 (6 1 ×3 6 ) L 8 (4 1 ×2 4 ) pan-selected and selected powdery boron-chromium-rare earth co-penetration agent, i...

Embodiment 3

[0057] Embodiment 3: A boron-chromium-rare earth co-penetration agent, including the following components by weight ratio, 6.15 parts of high-carbon ferrochromium, 5.5 parts of rare earth chloride, 15.7 parts of sodium fluorosilicate, 11.3 parts of silicon-calcium alloy, 23.2 parts of borax 35.3 parts of graphite, 1.9 parts of urea, and 1.02 parts of ammonium chloride.

[0058] Shot peen No. 45 steel sample for 1 hour, carry out co-infiltration of boron-chromium-rare earth under the condition of 680℃×4h, observe and test the sample after infiltration. The process is as follows:

[0059] 1. Shot blasting the workpiece

[0060] The Q3110A shot blasting machine is adopted, and the shot blasting time is 60 minutes. The steel shots are cast steel balls with a diameter of 1.4mm, and the linear speed of the steel balls is 70m / s;

[0061] 2. Co-infiltration agent preparation

[0062] Copenetration agent is through L 18 (6 1 ×3 6 ) L 8 (4 1 ×2 4 ) pan-selected and selected pow...

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Abstract

The invention relates to a boron-chrome-rare earth permeating agent and the low-temperature permeating process under the eutectoid line thereof. The permeating agent contains the components at weight ratio as follows: high carbon ferrochrome 6.1-6.2, rare earth chloride 5-6, sodium fluosilicate 15.5-16, calcium silicon 11-11.5, borax 23-23.5, graphite 35-35.5, carbamide 1.8-2, and ammonium chloride 1-1.05. The permeating process includes the workpiece shot blasting, the boxing and the boron-chrome-rare earth permeating step. In the boron-chrome-rare earth permeating step, after being sealed by double-deck water glass mud, a box is dried at 90-110 DEG C, and then is heated to 600-680 DEG C for getting into a heating furnace; when achieving the temperature, the timing heat preservation is carried out for 4-4.5 hours; after discharging, the air cooling process is carried out. The boron-chrome-rare earth permeating agent and the low-temperature permeating process under the eutectoid line have the advantages of little deformation of the workpiece, deep permeating layer of the workpiece, little brittleness of the permeating layer, good abrasion resistance of the workpiece, high hardness, low cost, saving energy, obtaining single Fe2B permeating layer, and so on.

Description

technical field [0001] The invention relates to a deformation chemical heat treatment process, in particular to a boron-chromium-rare earth co-infiltration agent and a low-temperature co-infiltration process below the eutectoid line. Background technique [0002] Boronizing refers to the heat treatment process of infiltrating boron into iron and steel materials to obtain iron borides. After boronizing, the surface of the workpiece has high hardness, wear resistance, oxidation resistance and thermal hardness. This process has gradually become a widely used surface diffusion infiltration process. Materials suitable for boriding cover almost all steel materials. [0003] Like other chemical heat treatments, boronizing also has obvious disadvantages, such as slow boronizing speed and high brittleness of boronizing layer. Since boronizing is generally carried out above the eutectoid temperature of iron and steel materials, cooling after infiltration will inevitably cause phase...

Claims

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Application Information

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IPC IPC(8): C23C8/60
Inventor 许斌张南南邢士波杨乐郭仁红宋月鹏冯承明
Owner SHANDONG JIANZHU UNIV
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