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A vacuum pressureless sintering multi-element Fe-Si alloy coating and its preparation method

An alloy coating, fe-si technology, applied in the field of vacuum pressureless sintering multi-element Fe-Si alloy coating and its preparation, can solve the problems of inconspicuous effect, limited application range of alloy, high brittleness of Fe-Si alloy, etc.

Active Publication Date: 2021-05-11
HUNAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Fe-Si alloys with higher silicon content are brittle, which limits the application range of the alloy; in recent years, some people have tried to add Cu to multi-element Fe-Si to improve the toughness of multi-element Fe-Si alloys, but the effect is not obvious
Preparing Fe-Si alloy coatings on the surface of metal materials can better solve the brittleness problem of Fe-Si alloys. For example, iron and silicon alloy coatings with different atomic ratios can be obtained by fusion siliconizing and chemical vapor deposition; but with Silicon carbide powder, chromium powder, iron powder, silicon powder, and molybdenum powder are used as the main raw materials, and multi-component Fe-Si alloy-based alloy coatings are under research and development under vacuum pressureless sintering

Method used

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  • A vacuum pressureless sintering multi-element Fe-Si alloy coating and its preparation method
  • A vacuum pressureless sintering multi-element Fe-Si alloy coating and its preparation method
  • A vacuum pressureless sintering multi-element Fe-Si alloy coating and its preparation method

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preparation example Construction

[0065] With reference to the accompanying drawings, the present invention is a vacuum pressureless sintering multi-component Fe-Si alloy coating and a preparation method thereof. It uses iron metal material as a matrix, first pre-treats the surface of the matrix, and then mixes the remaining SiC powder, 15 ~32% of Cr powder, 7-18% of Fe powder, 2-12% of Si powder and 2-12% of Mo powder as ingredients, adding silicon carbide powder, chromium powder, iron powder, silicon powder and 80% of the total mass of molybdenum powder is polyoxysilane mixed with adhesives. The mixed slurry is coated on the surface of the pre-treated substrate, cured at low temperature, and then sintered in vacuum and pressureless to obtain multi-component Fe -Si alloy coating, its preparation and operation steps:

[0066] Ⅰ. Process flow

[0067] The metal materials Q235 steel, 45 steel and 32Cr3Mo1V heat-resistant steel are selected as the matrix—the surface pretreatment of the matrix material: degreasin...

Embodiment 1

[0079] The base material is Q235 low carbon steel, see the chemical composition figure 2 (Table), the size of the sample is: 20mm × 12mm × 2mm, the preparation operation steps of the multi-component Fe-Si alloy coating on the surface of Q235 low carbon steel:

[0080] ①Q235 low carbon steel surface degreasing treatment, its formula is mass fraction: sodium hydroxide 20g / L, sodium carbonate 30g / L,

[0081] Sodium phosphate 8g / L, OP-10 emulsifier 2ml / L volume fraction; temperature 80℃;

[0082] ②The rust removal treatment on the surface of Q235 low carbon steel, the formula volume fraction is: sulfuric acid 80 ml / L, nitric acid 20ml / L, temperature 50 ℃;

[0083] ③Use 180#, 360#, 600# sandpaper to degreasing and derusting the Q235 low carbon steel in turn, then use acetone to ultrasonically clean the surface of the substrate, and dry it for later use;

[0084] ④Coating by mass percentage: Cr powder 15%, Fe powder 10%, Si powder 2%, Mo powder 2%, the balance is SiC powder for i...

Embodiment 2

[0090] The base material is Q235 low carbon steel, see the chemical composition figure 2 (Table), the size of the sample is: 20mm × 12mm × 2mm, the preparation operation steps of the multi-component Fe-Si alloy coating on the surface of Q235 low carbon steel:

[0091] ①Q235 low carbon steel surface degreasing treatment, its formula is mass fraction: sodium hydroxide 20g / L, sodium carbonate 30g / L,

[0092] Sodium phosphate 8g / L, OP-10 emulsifier 2ml / L volume fraction; temperature 80℃;

[0093] ②The rust removal treatment on the surface of Q235 low carbon steel, the formula volume fraction is: sulfuric acid 80 ml / L, nitric acid 20ml / L, temperature 50 ℃;

[0094] ③Use 180#, 360#, 600# sandpaper to degreasing and derusting the Q235 low carbon steel in turn, then use acetone to ultrasonically clean the surface of the substrate, and dry it for later use;

[0095] ④Coating by mass percentage: Cr powder 18%, Fe powder 12%, Si powder 6%, Mo powder 6%, the balance is SiC powder for i...

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Abstract

A vacuum pressureless sintered multi-element Fe-Si alloy coating and its preparation method, using metal materials as the substrate, the substrate surface treatment first, and with silicon carbide powder, chromium powder, iron powder, silicon powder and molybdenum powder as a component The mixed slurry of polyoxysilane as the adhesive is coated on the surface of the substrate, cured at low temperature, and sintered in vacuum at high temperature without pressure to obtain a multi-element Fe-Si alloy coating; it overcomes the existing vacuum hot-press sintering The Fe-Si alloy prepared by the method is brittle, the processing efficiency is low, and the equipment is complicated, and the Fe-Si alloy coating prepared by the fusion siliconizing method and the chemical vapor deposition method is thin, the infiltration time is long, and the solvent will corrode the container. SiCl 4 Cl produced by decomposition ‑1 Corrosion of ions to equipment and defects such as cleaning of the coating surface; by controlling the content of each component in the alloy, the microstructure, hardness, wear resistance and oxidation resistance of the multi-component FeSi alloy coating can be adjusted; it can be widely used in Surface protection of components working at high temperature in the fields of energy, metallurgy, and chemical industry.

Description

technical field [0001] The invention relates to a vacuum pressureless sintering multi-element Fe-Si alloy coating and a preparation method thereof. Background technique [0002] Fe-Si alloy is an excellent soft magnetic material with high magnetic permeability, low magnetostriction coefficient, low iron loss at high frequency and negative temperature coefficient of resistance. It also has excellent wear resistance, heat resistance and concentration Sulfuric acid corrosion and high temperature oxidation resistance, it has broad application prospects in the field of functional materials and structural materials; at present, the preparation methods of Fe-Si alloy mainly include vacuum hot pressing sintering method, hot rolling and cold rolling composite rolling method, melting Silicon infiltration and chemical vapor deposition. However, Fe-Si alloys with higher silicon content are brittle, which limits the application range of the alloys. In recent years, some people have trie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/10B22F7/04B22F1/00C22C29/06C22C30/00C23G1/08C23G1/19
CPCC22C29/065C22C29/067C22C30/00C23G1/081C23G1/19B22F3/1007B22F7/04B22F1/10
Inventor 彭成章彭昭玮杨佳霖吕峥谭欣荣左思
Owner HUNAN UNIV OF SCI & TECH