Thermal sprayed protective layer for metallic substrates

A technology of protective coating and metal substrate, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., and can solve the problem that the coating is not suitable for corrosion protection coating

Inactive Publication Date: 2008-12-24
MARKISCHES WERK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, said coating is not suitable as a corrosion protection coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The matrix consists of steel or nickel-based alloys. The mineral-metallic spray powder according to the invention is sprayed on the substrate by means of flame spraying, plasma spraying or HVOF. The spraying is carried out on a grit blasted, non-preheated substrate without further melting. The spray powder with particle size <50 μm is produced by spray drying and subsequent sintering (850° C., protective gas) from the following ingredients:

[0026] 65% by weight metal powder, composed of vaporized (gasverdüster) 80Ni20Cr alloy (nickel chromium), particle size < 25 μm;

[0027] 25% by weight smelted and finely milled artificial black basalt, % by weight: SiO 2 -50, CaO-20, Al 2 o 3 -15, MgO-8, Fe 2 o 3 -7, particle size<10μm; alkali content<0.5% by weight;

[0028] 10 weight percent crushed and screened, SiO 2 Natural quartz or cristobalite (particle size 25-50 μm) with purity >99%.

[0029] Mineral-metallic coatings formed from the sprayed powders were free of...

Embodiment 2

[0031] The matrix consists of steel, cast iron or nickel-based alloys. The two-component mineral spray powder according to the invention is sprayed on the substrate by flame spraying or plasma spraying. The spraying was done on a grit blasted substrate preheated to about 500°C and remelted at about 1100°C. Spray powders with particle sizes < 100 μm are produced from mixtures consisting of the following mineral components:

[0032] 67% by weight artificial white basalt that has been smelted, finely ground and screened (25-50 μm in particle size), weight percent: SiO 2 -54, CaO-20, MgO-5, Al 2 o 3 -16, Na 2 O-5; alkali content≤5% by weight;

[0033] 33 weight percent crushed and screened (particle size 25-100 μm), SiO 2 Cristobalite with a purity >99%.

[0034] In addition, in order to color the coating, 1-6 weight percent of the following oxides can be mixed in the spray powder: CoO, Cr 2 o 3 、TiO 2 , ZrO 2 , ZnO and Fe 2 o 3 .

[0035] Mineral coatings formed fro...

Embodiment 3

[0037] The matrix is ​​composed of aluminum alloy or magnesium alloy. Mineral-metallic-spray powders are sprayed on the substrate by plasma spraying or HVOF. The spray coating was performed on grit blasted, unpreheated substrates without remelting. Spray powders with a particle size <50 μm are produced from the following components by spray drying followed by sintering (620°C, protective gas):

[0038] 62% by weight metal powder, composed of vaporized 90Cu10Sn alloy (tin bronze), particle size < 25 μm;

[0039] 18% by weight of natural black basalt (basalt powder) that has been finely ground (particle size < 10 μm); alkali content < 5% by weight;

[0040] 20 weight percent crushed and screened (particle size 25-50 μm), SiO 2 Natural quartz or cristobalite with a purity >99%.

[0041] Mineral-metallic coatings formed from the sprayed powders were free from pores and cracks and had an approximate 18×10 -6 K -1 coefficient of thermal expansion. The coating has a thermal co...

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Abstract

The invention relates to a hot spraying air-tight protection coating for metal matrix, especially for Fe, Ni, Al, Mg and / or Ti basis metal matrix, wherein the spraying power comprises at least two components, wherein the first component is silicate mineral or igneous rock, and the second component is metal power and / or another silicate mineral or igneous rock, the alkali content in silicate mineral or igneous rock in the spraying power is less than 6 weight percentage.

Description

technical field [0001] The invention relates to protective coatings of metals or metal alloys which can be used at very high temperatures and in aggressive gaseous, liquid and solid media. In particular the present invention relates to thermally sprayed gas-tight protective coatings for metal substrates, especially those based on Fe, Ni, Al, Mg and / or Ti, wherein the spray powder for this purpose comprises at least two components, wherein The first component is a silicate mineral or igneous rock and the second component is metal powder and / or another silicate mineral or igneous rock. Background technique [0002] Enamel is well known as a non-metallic protective coating for various metals and alloys (see [1]: A. Petzold, H. Enameling and Enameling Technology, Wiley-VCH; Second Edition, (1992)). The protective coating has good adhesion to the substrate and protects the metallic substrate material from many aggressive media up to approximately 400° C. SiO 2 Silicate glass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/04C23C4/12
CPCC23C4/10C23C4/11C23C4/067C23C4/129C23C4/134Y10T428/12611Y10T428/12618C23C4/08
Inventor V·费尔洛特斯基
Owner MARKISCHES WERK
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