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Gas plasma sulfurizing process

A technology of plasma infiltration and gas, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problem that the quality of sulfurization is difficult to control, and achieve the effect of appropriate quantity, uniform distribution and uniform depth

Inactive Publication Date: 2011-01-26
BEIJING TIANMA BEARING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that the quality of sulfurization is difficult to control

Method used

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Examples

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example 1

[0032] Example 1: For general small and medium-sized bearings, the material is GCr15, and the sulfurizing depth is 2-3 μm, the operating procedures and process parameters of the sulfurizing process are set as follows:

[0033] 1. Preparation for sulfurizing:

[0034] Prepare the site and the workpiece of the bearing ring to be infiltrated, and check whether the furnace, vacuum pump, control system, temperature system, and vacuum system are normal.

[0035] 2. Cleaning and loading furnace:

[0036] Lift the furnace hood, blow out the furnace chamber, work table and sealing ring, and scrub them with acetone. Clean the bearing ring with gasoline first, and then scrub it with acetone. Place the workpiece on the workbench, lift the furnace cover and cover it, as attached figure 1 .

[0037] 3. Start the power supply, turn on the computer, and set the relevant process parameters.

[0038] Voltage: 0 Volts, Current: 0A. Sulfurizing temperature: 140°C.

[0039] Sulfurization ti...

example 2

[0047] Example 2: High temperature tempered bearing, high carbon chromium bearing steel material, when the sulfurizing depth is 3-5μm, the sulfurizing process operating procedures and process parameters are set as follows:

[0048] 1. Preparation for sulfurizing:

[0049] Prepare the site and the workpiece of the bearing ring to be infiltrated, and check whether the furnace, vacuum pump, control system, temperature system, and vacuum system are normal.

[0050] 2. Cleaning and loading furnace:

[0051] Lift the furnace hood, blow out the furnace chamber, work table and sealing ring, and scrub them with acetone. Clean the bearing ring with gasoline first, and then scrub it with acetone. Place the workpiece on the workbench, lift the furnace cover and cover it, as attached figure 1 .

[0052] 3. Start the power supply, turn on the computer, and set the relevant process parameters.

[0053] Voltage: 0 Volts, Current: 0A. Sulfurizing temperature: 250°C.

[0054] Sulfurizati...

example 3

[0062] Example 3: For high temperature resistant bearings, the material is M50, and when the depth of the sulfurized layer is 6-8 μm, the operating procedures and process parameters of the sulfurized process are set as follows:

[0063] 1. Preparation for sulfurizing:

[0064] Prepare the site and the workpiece of the bearing ring to be infiltrated, and check whether the furnace, vacuum pump, control system, temperature system, and vacuum system are normal.

[0065] 2. Cleaning and loading furnace:

[0066] Lift the furnace hood, blow out the furnace chamber, work table and sealing ring, and scrub them with acetone. Clean the bearing ring with gasoline first, and then scrub it with acetone. Place the workpiece on the workbench, lift the furnace cover and cover it, as attached figure 1 .

[0067] 3. Start the power supply, turn on the computer, and set the relevant process parameters.

[0068] Voltage: 0 Volts, Current: 0A. Sulfurizing temperature: 550°C.

[0069] Sulfur...

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Abstract

The invention discloses a gas plasma sulfurizing process, which belongs to the technical field of surface heat treatment. In the process, a steel workpiece is placed in a sealed sulfurizing furnace with direct-current high voltage and high vacuum, then an appropriate amount of carrier gasses such as hydrogen gas, argon gas, ammonia gas and the like, and hydrogen sulfide are introduced into the furnace to form a sulfurizing atmosphere. Those gases are split into plasma states of nitrogen, hydrogen, argon and sulfur after entering the sulfurizing furnace and dash against the surface of the steel workpiece positioned on a negative plate to ensure that the temperature of the workpiece is raised, wherein sulfur ions infiltrate into the surface of a component to form ferrous sulfide which covers the whole surface of the component to fulfill the aim of sulfurizing. The process has the advantages of no pollution, low cost and high sulfurizing quality, overcomes the defects of serious pollution and high cost of the conventional electrolytic sulfurizing, and also overcomes the defect of low quality of plasma sulfurizing performed by using solid sulfur on the market at present. Through sulfurizing treatment, the mechanical life of a mechanical workpiece can be improved by 2 to 3 times, and the process has obvious economical and social benefits and extensive development prospect when applied to an automobiles, a train, a wind-driven generators, a petroleum machinery and a rolling machine.

Description

technical field [0001] The invention belongs to the technical field of steel surface heat treatment. In particular, a gas plasma sulfurizing process is provided. Background technique [0002] The sulfurized layer is a sulfur-iron compound mainly composed of ferrous sulfide (FeS). The surface is microporous, and its microhardness is HV40-100. The crystal structure of FeS is hexagonal close-packed, which is the same as that of graphite, and it is in the form of phosphorus flakes. Has a very low dry coefficient of friction. It has very good self-lubricating properties. The combination of the sulfurized layer and the substrate is a mesh-like penetration method, and it combines with the metal substrate in an uneven zigzag shape, so it has a good bonding force. The micropores in the sulfurized layer can store lubricant and form a stable oil film, which increases the pressure resistance of the oil film by 2-3 times and hinders the direct contact between friction pairs. Especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38
Inventor 陶治安史立新王占良司徒春陈志辉李文兵文江罗磊军张帆
Owner BEIJING TIANMA BEARING CO LTD
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