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A low-temperature solid boronizing activator

An activator, solid technology, applied in solid diffusion coating, metal material coating process, coating and other directions, can solve the problems of large deformation, large gas volume, shallow co-infiltration layer, etc., to achieve enhanced boron atom activity, diffusion The effect of speed improvement and wide application field

Inactive Publication Date: 2016-02-17
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 mainly research on low-temperature multi-component boronizing.
After the workpiece is co-infiltrated and cooled by the above process, a relatively single Fe 2 B infiltration layer, but the co-infiltration layer is shallow; at the same time, due to the gas generated during the co-infiltration of sodium fluorosilicate, and the amount of gas is large, it affects the combination of the co-infiltration layer and the substrate

Method used

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  • A low-temperature solid boronizing activator
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  • A low-temperature solid boronizing activator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: a kind of low-temperature solid boronizing activator, its component content by mass ratio is: 12.6 parts of potassium fluoroborate, cryolite (Na 3 AlF 6 ) 35.8 parts, calcium fluoride (CaF 2 ) 23.0 parts, urea 14.8 parts.

[0031] The No. 20 steel sample was subjected to rolling treatment before infiltration. The rolling treatment parameters were 4Mpa and 1600r / min, and then boron-chromium-rare earth co-infiltration was carried out under the condition of 600℃×6h, and the sample was observed after infiltration. The process is as follows:

[0032] 1. Carry out pre-infiltration rolling treatment on the workpiece

[0033] The workpiece is rolled at 4Mpa and 1600r / min, and the rolling time is 60min.

[0034] 2. Activator preparation

[0035] The activator is prepared according to the above ratio, and the preparation process is as follows:

[0036] a. Grinding cryolite and calcium fluoride into 120 meshes;

[0037] b. Mix the components of the activator i...

Embodiment 2

[0046] Embodiment 2: a kind of low-temperature solid boronizing activator, its component content by mass ratio is: 16.6 parts of potassium fluoroborate, cryolite (Na 3 AlF 6 )38.9 parts, calcium fluoride (CaF 2 ) 25.8 parts, urea 18.7 parts.

[0047] The No. 20 steel sample was subjected to rolling treatment before infiltration. The rolling treatment parameters were 4Mpa and 1600r / min, and then boron-chromium-rare earth co-infiltration was carried out under the condition of 650℃×6h, and the sample was observed after infiltration. The process is as follows:

[0048] 1. Carry out pre-infiltration rolling treatment on the workpiece

[0049] The workpiece is rolled at 4Mpa and 1600r / min, and the rolling time is 60min.

[0050] 2. Activator preparation

[0051] The activator is prepared according to the above ratio, and the preparation process is as follows:

[0052] a. Grinding cryolite and calcium fluoride into 120 meshes;

[0053] b. Mix the components of the activator in...

Embodiment 3

[0062] Embodiment 3: a kind of low-temperature solid boronizing activator, its component content by mass ratio is: 16.4 parts of potassium fluoroborate, cryolite (Na 3 AlF 6 ) 39.2 parts, calcium fluoride (CaF 2 ) 26.6 parts, urea 17.8 parts.

[0063] The No. 45 steel sample was subjected to rolling treatment before infiltration. The rolling treatment parameters were 4Mpa and 1600r / min, and then boron-chromium-rare earth co-infiltration was carried out under the condition of 600℃×6h, and the sample was observed after infiltration. The process is as follows:

[0064] 1. Carry out pre-infiltration rolling treatment on the workpiece

[0065] The workpiece is rolled at 4Mpa and 1600r / min, and the rolling time is 60min.

[0066] 2. Activator preparation

[0067] The activator is prepared according to the above ratio, and the preparation process is as follows:

[0068] a. Grinding cryolite and calcium fluoride into 120 meshes;

[0069] b. Mix the components of the activator i...

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Abstract

The invention discloses a novel low-temperature solid boronizing activator. The novel low-temperature solid boronizing activator consists of the following components in parts by mass: 12.6-17.2 parts of potassium fluoborate, 35.8-40.4 parts of cryolite (Na5AlF6), 23.0-27.6 parts of calcium fluoride (CaF2) and 14.8-19.4 parts of urea. The novel low-temperature solid boronizing activator has the following advantages that 1, after boronization, a workpiece slightly deforms and generates neither phase change nor internal stress, and the application of the workpiece on a precise part is promoted greatly; 2, a low-temperature boronizing layer is very thick, the thickness is about 24-46 micrometers and the application field is very wide; 3, the boron atoms in low-temperature solid boronizing have enhanced activity and enhanced diffusion rate and is good in economy.

Description

technical field [0001] The invention relates to a low-temperature activator, in particular to a low-temperature solid boronizing activator. Background technique [0002] At present, boronizing is a thermochemical surface strengthening technology 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 reduce costs, reduce workp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/68
Inventor 袁兴栋许斌杨晓洁石磊
Owner SHANDONG JIANZHU UNIV