Method and apparatus for chromizing by alternating current field enhanced powder

An AC electric field and powder method technology, applied in the field of chemical heat treatment of metal parts surface, can solve the problems of increasing equipment cost, increasing process complexity and cost, inconvenient to process multiple small parts at the same time, etc., to improve efficiency and reaction rate. The effect of shortening the efficiency and holding time

Inactive Publication Date: 2012-06-13
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for chromized parts with complex shapes, in order to obtain a uniform infiltrated layer, it is necessary to make a corresponding complex-shaped profiling plate electrode as the positive electrode, which increases the complexity and cost of the process; The DC power supply increases the cost of the equipment; in addition, because the processed parts themselves are negative electrodes of the electric field, this method is inconvenient to process multiple small parts in the same seepage box at the same time

Method used

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  • Method and apparatus for chromizing by alternating current field enhanced powder
  • Method and apparatus for chromizing by alternating current field enhanced powder

Examples

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Embodiment 1

[0016] Material to be infiltrated: T12 carbon tool steel; composition of chromizing agent: chromium donor (ferrochrome, 30%), activator (ammonia chloride, 4%), loosening agent (charcoal, 2%), filler (carbonized silicon, balance).

[0017] Place two plate electrodes (6), (8) in parallel in the solid powder chromizing agent (5) composed of the above substances, and the distance between the infiltrated sample (7) and the electrodes (6) and (8) on both sides is 15mm , the two electrodes (6), (8) are respectively connected to a 50Hz AC power system (9) whose voltage is continuously adjustable in the range of 0-250 volts, the electrodes (6), (8) and the infiltrated sample (7) Together with the powder chromizing agent (5), the refractory mud sealing material (2) is used to seal the infiltration box (3) with the infiltration box cover (1), and the infiltration box is placed in a box furnace for heating. The chromizing temperature: 800 ℃, when the furnace temperature reaches the set v...

Embodiment 2

[0020] Material to be infiltrated: T12 carbon tool steel; composition of chromizing agent: chromium donor (ferrochrome, 30%), activator (ammonia chloride, 4%), loosening agent (charcoal, 2%), filler (carbonized silicon, balance).

[0021] The chromizing method and device are the same as in Example 1, chromizing temperature: 700°C, chromizing time 4 hours, the distance between the sample to be infiltrated and the plate electrodes on both sides is 15mm, and a 50Hz AC electric field of 4A is applied between the plate electrodes. Test results: T12 carbon tool steel obtains a 12μm chromizing layer; while using the same formulation of the chromizing agent, using the existing conventional powder chromizing process, the same chromizing at 700 ° C for 4 hours, basically no chromizing layer is formed.

Embodiment 3

[0023] Material to be infiltrated: T8 carbon tool steel; composition of chromizing agent: chromium donor (ferrochrome, 25%), activator (ammonia chloride, 2%; potassium fluoroborate, 2%), loosening agent (charcoal, 2%) %), filler (silicon carbide, balance).

[0024] The chromizing method and device are the same as in Example 1, chromizing temperature: 800°C, chromizing time 4 hours, the distance between the sample to be infiltrated and the plate electrodes on both sides is 15mm, and an 8A 50Hz AC electric field is applied between the plate electrodes. Test results: T8 carbon tool steel obtains a 28μm chromizing layer; while using the same formulation of the chromizing agent, using the existing conventional powder chromizing process, the same 800 ° C × 4 hours of chromizing, the thickness of the chromizing layer is only about 12 μm .

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Abstract

The invention provides a method and an apparatus for chromizing by alternating current field enhanced powder, and the method and the apparatus are used for enhancing corrosion resistance, antioxidation and abrasion resistance of a metal component. Two parallel plate-shaped electrodes are placed in a powdered chromizing agent; the two electrodes are respectively connected to a continuous adjustable 50 Hz AC power supply with a voltage within 0-250 volt through high temperature resistant leads; a component to be treated is placed between the two electrodes; the electrodes, the component and the chromizing agent are sealed together in a chromizing box and heated in a thermal treatment furnace; when a furnace temperature reaches a set value, alternating current field with a proper intensity is applied between the two electrodes, so as to realize rapid chromizing of the component. Compared with a prior art, the method increases a chromizing speed at least by 0.5-3 times at different temperatures within 700-1050 DEG C. The method and the apparatus can increase chromizing speed of a powder method chromizing on a component, increase utilization rate of the chromizing agent, reduce chromizing temperature, save energy and reduce component deformation.

Description

technical field [0001] The invention belongs to a method and device for chemical heat treatment on the surface of metal parts, in particular to an alternating electric field enhanced powder chromizing method for strengthening the surface of metal parts, improving the surface hardness, wear resistance, oxidation resistance and corrosion resistance of metal parts method and device. Background technique [0002] The chemical heat treatment process that infiltrates chromium into the surface of metal workpieces to form a chromizing layer is called chromizing. The chromized layer has high hardness, wear resistance, high temperature oxidation resistance, corrosion resistance and other properties. Through chromizing, low-cost carbon steel and low-alloy steel can be used instead of expensive high-alloy stainless steel, heat-resistant steel, die steel, etc. to make some corrosion-resistant and wear-resistant parts, on the premise of meeting the performance of parts , reduce producti...

Claims

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Application Information

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IPC IPC(8): C23C10/38
Inventor 谢飞孙力周燕飞
Owner CHANGZHOU UNIV
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