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Chemical heat treatment for solid rare earth accelerant

A technology of chemical heat treatment and infiltration catalyst, applied in the field of infiltration catalyst, can solve the problems of unsatisfactory infiltration effect, narrow scope of application, and small impact on improving tissue.

Inactive Publication Date: 2006-07-19
哈尔滨意锋稀土材料开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing solid rare earth infiltration agent has unsatisfactory infiltration effect, little influence on the improvement of structure, and surface hardness of workpiece after processing when treating carburized steel, structural steel, tool steel and die steel. Insufficient and narrow application range, a kind of chemical heat treatment solid rare earth permeation agent is provided

Method used

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specific Embodiment approach 1

[0004] Specific implementation method one: this embodiment is made of 40% to 90% of the infiltration agent and 10 to 60% of the auxiliary agent by weight percentage, and the infiltration agent is rare earth chloride (ReCl 3 ·nH 2 O), the auxiliary agent is composed of urea 20-30%, dihydroamine 20-30%, yellow blood salt 20-30% and potassium cyanate or sodium cyanate (KOCN or NaOCN) 20-25% by weight percentage , or consist of 50-70% potassium chloride, 20-40% sodium chloride and 2-10% boric acid. The rare earth chloride is a mixed rare earth chloride composed of La, Ce, Pr, and Nd in any proportion, or a rare earth chloride that is simple La or Ce.

specific Embodiment approach 2

[0005] Specific implementation mode two: the present embodiment is made by weight percentage of rare earth chloride 40% and auxiliary agent 60%, and described auxiliary agent is made of urea 25%, dihydroamine 25%, yellow blood salt 25% by weight percentage % and potassium cyanate or sodium cyanate (KOCN or NaOCN) 25%, or 70% potassium chloride, 24% sodium chloride and 6% boric acid. Other compositions are the same as in Embodiment 1.

specific Embodiment approach 3

[0006] Specific embodiment three: the present embodiment is made by weight percentage of rare earth chloride 90% and auxiliary agent 10%, and described auxiliary agent is made of urea 27%, dihydroamine 27%, yellow blood salt 26% by weight percentage % and potassium cyanate or sodium cyanate (KOCN or NaOCN) 20%, or 50% potassium chloride, 40% sodium chloride and 10% boric acid. Other compositions are the same as in Embodiment 1.

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Abstract

The solid rare-earth energizer for chemical thermal treatment comprises: 40-90w% energizer of rare-earth chloride as any combination of La, Ce, Pr and Nd or single La or Ce; and 10-60w% auxiliary agent that contains 20-30% urea, 2-30% biamino hydride, 20-30% potassium ferrocyanide, and 20-25% KCN or NaCN; or 50-70% KCl, 20-40% NaCl, and 2-10% boric acid. This invention overcomes defects in prior art, and has high efficiency, large effect to metal phase tissue modification, and wide application range.

Description

technical field [0001] The present invention relates to a kind of penetrating agent. Background technique [0002] Gas carburizing and carbonitriding are important production processes for transmission gears in the automotive industry and motor vehicles, and are also extremely important surface treatment processes for boilers, steam turbines, railways and other mechanical products. The properties of the rare earth infiltration catalysts currently used in the above two types of processes are all liquid, and the rare earth chlorides are mainly dissolved in an organic solution to form a liquid rare earth infiltration agent, which is injected into the gas carburizing furnace by dripping. The process plays a role in infiltration. Production practice has proved that due to the diversity of varieties, types and structures of gas carburizing furnaces and gas nitriding furnaces, a single liquid rare earth infiltration agent is far from meeting the actual needs of production. The ca...

Claims

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Application Information

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IPC IPC(8): C23C8/32
Inventor 刘成友王鸿春闫牧夫张国良刘志儒
Owner 哈尔滨意锋稀土材料开发有限公司
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