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A vacuum carburizing method with temperature reduction and acceleration

A vacuum carburizing and speed-up technology, applied in the direction of solid-state diffusion coating, coating, metal material coating technology, etc., can solve the problems of high carburizing temperature, uneven carburizing layer structure, high energy consumption, etc.

Active Publication Date: 2021-07-06
HARBIN ENG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the existing vacuum carburizing technology, such as high carburizing temperature, uneven carburizing layer structure, long carburizing cycle, high energy consumption, etc., and provide a method for reducing carburizing temperature and improving vacuum carburizing efficiency. And a composite surface strengthening method that uses supersonic particle bombardment technology to bombard rare earth oxide-hard ceramic mixed powder on the surface of the sample, forms a nano-rare earth modified layer on the surface of the substrate, and then performs vacuum carburizing to improve the quality of the infiltration layer.

Method used

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  • A vacuum carburizing method with temperature reduction and acceleration
  • A vacuum carburizing method with temperature reduction and acceleration
  • A vacuum carburizing method with temperature reduction and acceleration

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specific Embodiment approach 1

[0020] Specific implementation mode one: the vacuum carburizing treatment method of cooling and increasing speed in this implementation mode is implemented according to the following steps:

[0021] 1. Base material preparation: Surface polishing and cleaning treatment are carried out on the base material in turn to obtain the cleaned base material;

[0022] 2. Compound pretreatment:

[0023] a. Mixing powder: using a ball mill to mix the rare earth oxide powder and the hard ceramic powder to obtain a mixed powder, the content of the rare earth oxide in the mixed powder is 5wt% to 20wt%;

[0024] b. Supersonic particle bombardment: the mixed powder is loaded into the supersonic particle bombardment equipment, and the cleaned substrate is placed under the gun head of the supersonic particle bombardment equipment for supersonic particle bombardment treatment, and the mixed powder is controlled during the supersonic particle bombardment process The vertical spraying distance is ...

specific Embodiment approach 2

[0028] Embodiment 2: This embodiment differs from Embodiment 1 in that the base material in step 2 is low-carbon steel (carbon content<0.25%).

[0029] The low-carbon steel described in this embodiment can be 17CrNiMo6, 18Cr2Ni4WA, 12Cr2Ni4A and the like.

specific Embodiment approach 3

[0030] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the rare earth oxide described in step two is La 2 o 3 or CeO 2 .

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Abstract

The invention relates to a vacuum carburizing method with temperature reduction and speed increase, which belongs to the field of heat treatment and surface engineering, and aims to solve the problems of high carburizing temperature and long carburizing period existing in the existing vacuum carburizing technology. Vacuum carburizing treatment method for temperature reduction and acceleration: 1. Surface polishing and cleaning treatment of the substrate in sequence; 2. Mix rare earth oxide powder with hard ceramic powder to obtain mixed powder, and set the substrate under supersonic particle bombardment Under the gun head of the equipment, the mixed powder is used for supersonic particle bombardment treatment, and the spray speed is controlled to be 300-1200m / s to obtain the substrate with nano-rare earth modified layer; 3. The substrate with nano-rare earth modified layer The material is placed in a vacuum carburizing furnace, the furnace is evacuated, and heated to the carburizing temperature for vacuum carburizing treatment. Compared with ordinary vacuum carburizing, the composite strengthening technology adopted in the present invention can reduce the carburizing temperature, improve the vacuum carburizing efficiency, shorten the carburizing period and have higher surface hardness of the carburizing layer.

Description

technical field [0001] The invention belongs to the field of heat treatment and surface engineering, and specifically relates to a nano-rare earth modified layer prepared on the surface of a material by using supersonic particle bombardment technology, so as to reduce the carburizing temperature, improve the toughness of carburizing workpieces, increase the carburizing speed and improve the quality of the carburizing layer Methods. Background technique [0002] Carburizing is the main heat treatment process to improve the comprehensive performance of mechanical parts such as gears and bearings. It changes the surface phase structure of metal materials through the infiltration of carbon atoms, so that the workpiece can achieve high surface hardness, high wear resistance and fatigue strength. It has become an ocean Necessary process before the service of metal workpieces in the fields of ships, wind power, metallurgical mines, aerospace and other fields. However, the traditio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/20C23C8/02C23C8/22
CPCC23C8/02C23C8/20C23C8/22
Inventor 崔秀芳宋圣强金国董美伶刘二宝杨雨云刘金娜
Owner HARBIN ENG UNIV
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