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Preparation method for nanometer ceramic composite coating material on surface of hot work die steel

A technology of hot-working die steel and nano-ceramics, which is applied in the direction of coating, metal material coating technology, fusion spraying, etc., can solve the problems of high one-time cost, short service life, short service life of molds, etc., and achieve anti-oxidation And the effect of good thermal shock resistance, excellent wear resistance and prolonging service life

Inactive Publication Date: 2012-08-29
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used surface technologies in the surface strengthening and repairing of hot work molds include: chemical heat treatment, surface coating treatment, surface processing strengthening treatment, brush plating repair technology and Arc surfacing repair technology, etc., but the above-mentioned process has disadvantages such as high one-time cost, low surface hardness, and short service life; while the nano-ceramic composite coating prepared by plasma spraying has excellent friction and wear resistance, oxidation resistance, thermal shock resistance, etc. Excellent performance, can provide all-round effective protection for metal parts, and is widely used in many fields; however, traditional ceramic coatings prepared by plasma spraying (that is, micron-scale coatings) also have some shortcomings, such as poor toughness of the coating, These shortcomings severely limit the application range of plasma sprayed ceramic coatings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Compound: 97% Al 2 o 3 +3%TiO 2 (mass fraction, referred to as AT3, the same below), nano-Al 2 o 3 Exist in α phase, particle size range 50~55nm; Nano TiO 2 It exists in the rutile phase, and the particle size range is 5-8nm; after the powder is sintered, the spray feed material of 40 μm-45 μm is screened out.

[0026] Spraying material: the transition layer is KF-2 nickel-clad aluminum powder; the surface layer is AT3 spraying feed.

[0027] Preparation of nano-ceramic composite coating: KF-2 nickel-clad aluminum powder is plasma sprayed on the surface of H13 steel to form a 55 μm transition layer; then AT3 powder is plasma sprayed on the transition layer to form a thickness of about 0.15 mm Nano-ceramic composite coating, the spraying power is 20, 25, 30, 35kw respectively.

Embodiment 2

[0029] Mixture: 87% Al 2 o 3 +13%TiO 2 (AT13), Nano Al 2 o 3 Exist in α phase, particle size range 45~50nm; Nano TiO 2 It exists in the rutile phase, with a particle size range of 8-10nm; after the powder is sintered, the spray feed material of 55μm-60μm is screened out.

[0030] Spraying material: the transition layer is KF-2 nickel-clad aluminum powder; the surface layer is AT13 spraying feed.

[0031] Preparation of nano-ceramic composite coating: KF-2 nickel-clad aluminum powder is plasma sprayed on the surface of H13 steel to form a transition layer of 75 μm; then AT13 powder is plasma sprayed on the transition layer to form a thickness of about 0.15 mm. Nano-ceramic composite coating, the spraying power is 20, 25, 30, 35kw respectively.

Embodiment 3

[0033] Mixture: 80% Al 2 o 3 +20%TiO 2 (AT20), Nano Al 2 o 3 Exist in α phase, particle size range 50~55nm; Nano TiO 2 It exists in the rutile phase, and the particle size range is 5-8nm; after the powder is sintered, the spray feed material with a size of 50 μm-55 μm is screened out.

[0034] Spraying material: the transition layer is KF-2 nickel-clad aluminum powder; the surface layer is AT20 spraying feed.

[0035] Preparation of nano-ceramic composite coating: KF-2 nickel-clad aluminum powder is plasma sprayed on the surface of H13 steel to form a transition layer of 80 μm; then AT20 powder is plasma sprayed on the transition layer to form a thickness of about 0.15mm. Nano-ceramic composite coating. The spraying power is 30kw, and the spraying power is 20, 25, 30, 35kw respectively.

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Abstract

The invention relates to hot work die steel, in particular to a preparation method for a nanometer ceramic composite coating material on the surface of hot work die steel. The preparation method comprises the steps of preparing a spray feeding material, preprocessing an H13 steel basal body, preparing a transition layer and preparing a nanometer ceramic composite coating. The nanometer ceramic composite coating material and the preparation method thereof have the benefits as follows: (1) the nanometer ceramic composite coating has the characteristics of high microhardness and good wear resistance; (2) the oxidation resistance and the thermal shock resistance are better; and (3) the raw materials are cheap and general, the process is simple, and the cost is lower, so that the industrial production is facilitated. The prepared nanometer ceramic composite coating can take effect of repairing defects or enhancing the H13 steel basal body so as to recover and prolong the service life of the hot work die.

Description

technical field [0001] The invention relates to hot work die steel, in particular to a method for preparing a nano-ceramic composite coating material on the surface of hot work die steel. Background technique [0002] H13 steel is a C-Cr-Mo-Si-V type medium alloy hot work die steel, which is the most representative and widely used hot work die steel, with good red hardness, high toughness and excellent heat resistance Fatigue performance, etc., are widely used at home and abroad to manufacture hot forging dies, non-ferrous metal die-casting dies and hot extrusion dies, etc.; the hardness of H13 steel after quenching and tempering by conventional heat treatment process is generally 42-48 HRC, and the wear resistance is insufficient , the service life of the mold is short. In addition, because the mold needs to be in contact with the molten metal for a long time under high temperature conditions, the main failure forms of H13 steel are thermal wear (melting loss) and thermal f...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/10C23C4/08C23C4/02C23C4/11C23C4/134
Inventor 宋仁国王超
Owner CHANGZHOU UNIV
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