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Drip-feed type gas boriding process

A gas infiltration and dripping technology, applied in coating, heat treatment process control, metal material coating process, etc., can solve the problems of difficult to ensure the uniformity of salt bath composition, difficult to clean workpiece, poor salt bath activity, etc. The effect of safe and reliable environment, good working environment and convenient operation

Inactive Publication Date: 2007-04-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activity of the salt bath is poor, it is difficult to clean the workpiece, the life of the crucible is short, and it is difficult to ensure the uniformity of the temperature of the salt bath and the uniformity of the composition of the salt bath in mass production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, the material of the test block is 45 steel; the size of the test block is 30×20×10mm 3 ; Trimethyl borate obtained by esterification reaction of boric acid and methanol.

[0029] a) Boronizing preparation

[0030] Measure trimethyl borate and methanol with a measuring cup at a volume ratio of 1:1, weigh the trimethyl borate measured through the measuring cup, and then weigh according to the weight ratio of rare earth chloride to trimethyl borate 1:25 For rare earth chloride, the above-mentioned weighed trimethyl borate, methanol and rare earth chloride are mixed to prepare a boronizing agent.

[0031] Pour the above-prepared boronizing agent and methanol into two containers of infusion solution in the carburizing furnace respectively. Heat the carburizing furnace, and when the temperature in the furnace rises to 740°C, start dripping methanol and boronizing agent exhaust into the furnace, the methanol dripping volume is 70 drops / min, about 1.4ml / mi...

Embodiment 2

[0041] In this embodiment, the material of the test block is 40Cr, and the size of the test block is 30×20×10mm 3

[0042] a) Boronizing preparation

[0043]First prepare the boronizing agent, measure methanol and trimethyl borate respectively according to the volume ratio of 1:1.2, weigh the trimethyl borate measured by the measuring cup, and then weigh the boronizing agent according to the ratio of rare earth chloride and trimethyl borate 1:32. Rare earth chloride is weighed by weight, and the above-mentioned weighed trimethyl borate, methanol and rare earth chloride are mixed to prepare a boronizing agent.

[0044] Pour the above-prepared boronizing agent and methanol into two containers of infusion solution in the carburizing furnace respectively. Heat the carburizing furnace, and when the temperature in the furnace rises to 750°C, start dripping methanol and boronizing agent exhaust into the furnace. The methanol dripping volume is 75 drops / min, which is about 1.5ml / min...

Embodiment 3

[0054] In this embodiment, the material of the test block is 20 steel, and the size of the test block is 30×20×10mm 3 .

[0055] a) Boronizing preparation

[0056] First prepare the boronizing agent, measure methanol and trimethyl borate respectively according to the volume ratio of 1:1.5, weigh the trimethyl borate measured by the measuring cup, and then weigh the boronizing agent according to the ratio of rare earth chloride and trimethyl borate 1:40. Rare earth chloride is weighed by weight, and the above-mentioned weighed trimethyl borate, methanol and rare earth chloride are mixed to prepare a boronizing agent.

[0057] Pour the above-prepared boronizing agent and methanol into two containers of infusion solution in the carburizing furnace respectively. Heat the carburizing furnace, and when the temperature in the furnace rises to 760°C, start dripping methanol and boronizing agent into the furnace to exhaust, the methanol dripping volume is 80 drops / min, about 1.6ml / mi...

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PUM

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Abstract

This invention involves a drip gas boronizing approach. The method contains the steps of: adopting ordinary drip gas carburizing furnace, heating the furnace to the temperature for boronizing, and dropping boriding agent containing trimethyl borate, methanol and chloridated rare earth and methanol to the furnace, decomposing and to form boride on the steel surface through adsorption and diffusion of boron atom decomposed by trimethyl borate. The invention has the advantage of uniform and compact leaking layer, good surface quality, Layer depth and surface boron content can be controlled; no need of cleaning workpiece after infiltration, with directly quenching after infiltration and low labor intensity; penetration enhancers without rank poison, non-explosive, with relatively good and safe, reliable working environment, without specialized equipments, commonly used carburizing furnace can meet the requirements, can handle all sorts of shapes and sizes workpiece, can be easy to achieve automatic control, with high efficiency, easy operation and high applicability.

Description

technical field [0001] The invention relates to a metal heat treatment method, more specifically to a drop-injection gas boronizing method. Background technique [0002] Boron is located before the carbon element in the second period of the periodic table, and its atomic radius is larger than that of carbon and nitrogen, and its ratio to the atomic radius of transition metals is greater than 0.59. Therefore, the compounds formed by boron and transition metals have a much larger The interstitial phase has a much more complex crystal structure. The metal compounds such as FeB, Fe2B, TiB2, ZrB2, VB2, CrB2 have high hardness and good thermal stability, which are higher in hardness and thermal stability than corresponding carbides and nitrides, but it is difficult to cut and other deformation processing. Generally, for steel used in machinery manufacturing, a large amount of boron cannot be added during the smelting process, and only a small amount of boron can be added to impr...

Claims

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Application Information

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IPC IPC(8): C23F17/00C23C8/08C21D1/18C21D11/00
Inventor 纪嘉明吴晶
Owner JIANGSU UNIV
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