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A preparation method of ablation-resistant composite windshield

A composite material, ablation-resistant technology, used in manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of low efficiency and high cost of wind hoods, and achieve high production efficiency, low cost, and stable air supply. Effect

Active Publication Date: 2020-06-09
YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low efficiency and high cost of manufacturing windshields in the prior art, the invention provides a method for preparing windshields made of ablation-resistant composite materials

Method used

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  • A preparation method of ablation-resistant composite windshield
  • A preparation method of ablation-resistant composite windshield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method for an ablation-resistant composite windshield, comprising the following steps:

[0022] 1) Preparation of high-temperature-resistant sand paint: select silica sand with a particle size of 10 mesh and magnesia powder with a particle size of 200 mesh, put them into tap water respectively, add suspending agent powdered cellulose and white latex, and stir evenly;

[0023] 2) Prepare the windshield model and paint: use polystyrene foam 1 as the model material, with a density of 0.006g / cm 3 , the casting shrinkage rate is 2%, cut out the windshield model 2 in the polystyrene foam 1 with resistance wire, brush the silica sand coating on the surface of the windshield model 2 corresponding to the outer surface of the windshield, and control the silica sand coating 4 layers The thickness is 1.9mm, brush the magnesia powder coating on the surface of the hood model 2 corresponding to the inner cavity of the hood, control the thickness of the magnesia powder co...

Embodiment 2

[0028] A preparation method for an ablation-resistant composite windshield, comprising the following steps:

[0029] 1) Preparation of high-temperature resistant sand coating: select silica sand with a particle size of 11 mesh and magnesia powder with a particle size of 235 mesh, put them into tap water respectively, add suspending agent powdery cellulose and white latex, and stir evenly;

[0030] 2) Prepare the windshield model and paint: polystyrene foam 1 is used as the model material with a density of 0.007g / cm 3 , the casting shrinkage rate is 2%, cut out the windshield model 2 in the polystyrene foam 1 with resistance wire, brush the silica sand coating on the surface of the windshield model 2 corresponding to the outer surface of the windshield, and control the silica sand coating 4 layers The thickness is 2mm, brush the magnesia powder coating on the surface of the hood model 2 corresponding to the inner cavity of the hood, control the thickness of the magnesia powder ...

Embodiment 3

[0035] A preparation method for an ablation-resistant composite windshield, comprising the following steps:

[0036] 1) Preparation of high-temperature-resistant sand coating: select silica sand with a particle size of 12 mesh and magnesia powder with a particle size of 270 mesh, put them into tap water respectively, add suspending agent powdery cellulose and white latex, and stir evenly;

[0037] 2) Prepare the windshield model and paint: use polystyrene foam 1 as the model material with a density of 0.008g / cm 3 , the casting shrinkage rate is 2%, cut out the windshield model 2 in the polystyrene foam 1 with resistance wire, brush the silica sand coating on the surface of the windshield model 2 corresponding to the outer surface of the windshield, and control the silica sand coating 4 layers The thickness is 2.1mm, brush the magnesia powder coating on the surface of the hood model 2 corresponding to the inner cavity of the hood, control the thickness of the magnesia powder co...

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Abstract

The invention discloses a preparation method of an ablation-resistant composite material wind cover. The preparation method comprises the following steps of preparing of a high temperature-resistant sand coating, preparing of a wind cover model and coating, box loading, metal smelting and casting, cooling, post-treatment and the like. The preparation method has the beneficial effects that the silica sand material with larger granularity is coated to the surface of the wind cover model at the outer surface of the wind cover, liquid steel can permeate into a gap between sands, and a metal and sand mechanically mixed ablation outer casing is formed; by adopting the technology of controlling the casting temperature of the liquid steel and the vacuum degree in a sand box, the thickness and uniformity of the mixed sintering ceramic layer are controllable, the ceramic layer is firmly adhered with the steel of the main body, the melting point is high, the hardness is high, the ablation-resistant property is strong, and the functions of delaying the ablation of the wind cover and prolonging the service life are realized; the procedures are simple, the number of auxiliary tools is fewer, thehigh temperature-resistant sand is free from sticking and can be repeatedly used, the production efficiency is high, and the cost is low.

Description

technical field [0001] The invention relates to casting and smelting of metal materials, in particular to a preparation method of an ablation-resistant composite windshield. Background technique [0002] The wind hood is an important part that is easy to be ablated in the boiler combustion system of the thermal power plant. It is welded on the air pipe and casing. The compressed air flows to the top of the air hood through the air pipe, and then flows downward through the exhaust hole of the air hood into the pulverized coal for combustion. Area. The function of the windshield is mainly to protect the air duct from ablation, change the direction and distribution of the airflow, and improve the combustion environment. The wind hood is placed in the pulverized coal combustion area of ​​the boiler to withstand the ablation of combustion gas and high-temperature flames. The service environment is relatively harsh, and it is easy to burn out. The service life is generally 20-24 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22C9/04C22C38/02C22C38/04C22C38/58C22C38/34C22C38/44
CPCB22C3/00B22C9/046C22C38/02C22C38/04C22C38/34C22C38/44C22C38/58
Inventor 郭在在曹剑武周雅伟刘发付李国斌赵斌张丛郭建斌贾书波王志伟贾峻张俊美
Owner YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
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