Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Mold shell fire-resistant coating material for investment casting precision castings

A precision casting and refractory coating technology, which is applied to casting molding equipment, coatings, casting molds, etc., can solve the problems of high product defect rate, long residence time, poor mold filling, etc., and achieve good surface quality, Extended service life and high dimensional accuracy

Inactive Publication Date: 2019-11-22
安徽省含山县兴建铸造厂
View PDF17 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, alloy materials with special properties have been gradually excavated, but the shell refractory coating material used in the existing investment casting is poured by molten metal in the application, due to the interface reaction, the phenomenon of mucous membrane is serious, and it is easy to produce casting Porosity and shrinkage porosity, poor filling performance, and easy fracture, especially when preparing highly chemically active castings with complex structures, the residence time is long, the casting performance is poor, and there will be reactions between the shell coating and the surface of the casting under high temperature overheating. Problems leading to increased product defect rate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Mold shell fire-resistant coating material for investment casting precision castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A shell refractory coating material for investment casting precision castings, prepared by dispersing the prepared powdery refractory material into a liquid binder with a powder-to-liquid ratio of 2.2 g / ml, and adding other auxiliary materials after the dispersion is uniform to prepare the coating Layer material, described refractory material preparation method comprises the following steps:

[0020] (1) Weigh 10 grams of tetraethyl orthosilicate and place it in a beaker, add 55 milliliters of absolute ethanol, stir evenly, add ammonia solution dropwise to adjust the pH value of the system between 10.3-10.5, transfer it to a volumetric flask, and use Dilute to the volume with deionized water to obtain 100 ml of solution, place it in a 55°C oven for 24 hours to form a gel;

[0021] (2) Weigh 18 grams of magnesium chloride and place it in a beaker, add 80 milliliters of deionized water, stir to dissolve, transfer the gel prepared in step (1) to an aqueous magnesium chlori...

Embodiment 2

[0030] A shell refractory coating material for investment casting precision castings, prepared by dispersing the prepared powdery refractory material into a liquid binder with a powder-to-liquid ratio of 2.25 g / ml, and then adding other auxiliary materials to prepare the coating material Layer material, described refractory material preparation method comprises the following steps:

[0031] (1) Weigh 11 grams of tetraethyl orthosilicate and place it in a beaker, add 57 milliliters of absolute ethanol, stir well, add ammonia solution dropwise to adjust the pH value of the system between 10.3-10.5, transfer it to a volumetric flask, and use Dilute with deionized water to obtain 100 ml of solution, place it in an oven at 58°C for aging for 27 hours, and form a gel;

[0032] (2) Weigh 19 grams of magnesium chloride and place it in a beaker, add 85 milliliters of deionized water, stir to dissolve, transfer the gel prepared in step (1) to an aqueous solution of magnesium chloride, a...

Embodiment 3

[0041] A shell refractory coating material for investment casting precision castings, prepared by dispersing the prepared powdery refractory material into a liquid binder with a powder-to-liquid ratio of 2.3 g / ml, and adding other auxiliary materials after the dispersion is uniform. Layer material, described refractory material preparation method comprises the following steps:

[0042] (1) Weigh 12 grams of tetraethyl orthosilicate and place it in a beaker, add 60 milliliters of absolute ethanol, stir evenly, add ammonia solution dropwise to adjust the pH value of the system between 10.3-10.5, transfer it to a volumetric flask, and use Dilute with deionized water to obtain 100 ml of solution, and place it in an oven at 60°C for 30 hours to age to form a gel;

[0043] (2) Weigh 20 grams of magnesium chloride and place it in a beaker, add 90 milliliters of deionized water, stir to dissolve, transfer the gel prepared in step (1) to an aqueous magnesium chloride solution, add 12 m...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of new material processing and discloses a mold shell fire-resistant coating material for investment casting precision castings. According to the mold shell fire-resistant coating material for the investment casting precision castings, by means of study on reaction thermodynamic characteristics and investment casting features, a prepared nano-particle-size powdery fire-resistant material is dispersed in a liquid binder, the powder liquid ratio is 2.2-2.3 gram / milliliter, other auxiliary materials are added after dispersion is performed evenly to prepare the coating material, the prepared coating material can withstand the high temperature of 2400 DEG C or above, does not react with most metal and non-metal elements basically, has the reaction inert and can withstand pouring temperature rising, the casting surface barely reacts with the mold shell coating, the thickness of generated a small amount of a diffusion layer is less than 0.1 micron,the mold shell fire-resistant coating material has good coverage aggregation stability and coating performance, and the prepared investment casting surface is smooth without cracks and high in size accuracy.

Description

technical field [0001] The invention belongs to the technical field of new material processing, and in particular relates to a shell refractory coating material for investment casting precision castings. Background technique [0002] The traditional investment casting process refers to making a model with wax, wrapping multiple layers of refractory materials such as clay and binder on the outside, heating the wax to melt and flow out, so as to obtain an empty shell formed by refractory materials, and then melting the metal After that, it is poured into the empty shell, and after the metal is cooled, the refractory material is crushed to obtain metal parts. This process of processing metal is called investment casting, also known as investment casting or lost wax casting. Modern investment casting is developed on the basis of traditional wax casting. [0003] Castings are metal shaped objects obtained by various casting methods and play an important role in various fields. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/04
CPCB22C3/00B22C9/04
Inventor 李传
Owner 安徽省含山县兴建铸造厂
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com