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

Primary layer coating used for investment casting shell

A technology of investment casting and surface coating, which is applied in casting molding equipment, molds, and mold components, etc., can solve problems such as adverse effects on the surface finish of castings, uneven distribution of surface coatings, and general surface shell strength. , to achieve the effect of improving strength and surface quality, high practical value, and improving surface quality

Inactive Publication Date: 2020-02-18
东风精密铸造安徽有限公司
View PDF9 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the surface coating of investment casting is mainly made of quartz powder as the refractory material and silica sol as the binder. The drying speed is slow and the production efficiency is low. Moreover, the strength of the surface shell is average and it is prone to cracking. , leading to defects such as burrs in the casting, which affects the quality of the casting; the wettability of the surface of the wax model is poor, the surface coating is unevenly distributed, and the surface of the shell is rough, which has a negative impact on the surface finish of the casting

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
  • Primary layer coating used for investment casting shell
  • Primary layer coating used for investment casting shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of surface coating for investment casting mold shell, comprises following raw material:

[0023] Silica Sol, Polyvinyl Acetate-Nano SiO 2 Composite emulsion, quartz powder, polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate, silane coupling agent KH-570, wetting agent, defoamer, water;

[0024] Polyvinyl acetate-nano SiO 2 The weight ratio of composite emulsion to silica sol is 15:100; the weight ratio of quartz powder to silica sol is 350:100; the weight ratio of polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate to silica sol is 0.4:0.2:0.2: 100; the weight ratio of silane coupling agent to silica sol is 0.5:100; the weight ratio of wetting agent to silica sol is 0.3:100; the weight ratio of defoamer to the silica sol is 0.2:100; water to silicon The weight ratio of the sol is 10:100.

Embodiment 2

[0026] A kind of surface coating for investment casting mold shell, comprises following raw material:

[0027] Silica Sol, Polyvinyl Acetate-Nano SiO 2 Composite emulsion, quartz powder, polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate, silane coupling agent KH-570, wetting agent, defoamer, water;

[0028] Polyvinyl acetate-nano SiO 2 The weight ratio of composite emulsion to silica sol is 15:100; the weight ratio of quartz powder to silica sol is 350:100; the weight ratio of polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate to silica sol is 0.4:0.2:0.2: 100; the weight ratio of silane coupling agent to silica sol is 0.5:100; the weight ratio of wetting agent to silica sol is 0.3:100; the weight ratio of defoamer to the silica sol is 0.2:100; water to silicon The weight ratio of the sol is 10:100.

[0029] The solid content of the silica sol is 30%, the pH is 9, and the colloidal particle size is 10nm; the quartz powder is 250 mesh; the polyvinyl alco...

Embodiment 3

[0037] A kind of surface coating for investment casting mold shell, comprises following raw material:

[0038] Silica Sol, Polyvinyl Acetate-Nano SiO 2 Composite emulsion, quartz powder, polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate, silane coupling agent KH-570, wetting agent, defoamer, water;

[0039] Polyvinyl acetate-nano SiO 2 The weight ratio of composite emulsion to silica sol is 20:100; the weight ratio of quartz powder to silica sol is 300:100; the weight ratio of polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate to silica sol is 0.6:0.3:0.3: 100; the weight ratio of silane coupling agent to silica sol is 0.8:100; the weight ratio of wetting agent to silica sol is 0.4:100; the weight ratio of defoamer to silica sol is 0.3:100; the weight ratio of water to silica sol The weight ratio is 12:100.

[0040] The solid content of the silica sol is 35%, the pH is 9.5, and the colloidal particle diameter is 10nm; the quartz powder is 300 mesh; the ...

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
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses primary layer coating used for an investment casting shell. The primary layer coating comprises the following raw materials including silica sol, polyvinyl acetate-nano SiO2 composite emulsion, quartz powder, polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate, silane coupling agent KH-570, a wetting agent, a defoaming agent and water. The primary layer coating used for the investment casting shell has a fast drying speed and high wettability and coating property, and the manufactured shell is high in strength, crack resistance, surface quality and production efficiency.

Description

technical field [0001] The invention relates to the technical field of investment casting, in particular to a surface coating for investment casting shells. Background technique [0002] Investment casting, also known as lost wax casting, consists of the main processes of making wax molds for parts, coating refractory shells, shell dewaxing, shell roasting, smelting and pouring, castings dropping, and casting shot blasting. It is suitable for the production of small castings with high precision and complex shapes, such as blades of turbine engines. Coating is an important component raw material for shell production. The surface layer of the shell is directly in contact with the molten metal during casting and casting, so the weight of the surface coating is directly related to the surface weight of the casting. At present, the surface coating of investment casting is mainly made of quartz powder as the refractory material and silica sol as the binder. The drying speed is s...

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
IPC IPC(8): B22C3/00B22C7/02
CPCB22C3/00B22C7/02
Inventor 辛照龙
Owner 东风精密铸造安徽有限公司
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