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Aluminasol bonded alumina mould case and manufacturing method thereof

A kind of alumina and aluminum sol technology, applied in the direction of manufacturing tools, casting equipment, metal processing equipment, etc., can solve problems such as waste, casting surface pollution, damage to casting quality, etc., to achieve controllable process parameters and meet thermal shock resistance , the effect of not easily deformed

Active Publication Date: 2011-04-27
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the new superalloy contains a certain amount of highly active metal elements such as Re, Ru, Hf, Cr, Y, and a relatively high content of Al elements. When using traditional silica sol as a binder to prepare mold shells for precision casting or directional solidification, Often due to highly reactive metals and SiO 2 surface or internal contamination of the casting, damage the quality of the casting or cause waste

Method used

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  • Aluminasol bonded alumina mould case and manufacturing method thereof
  • Aluminasol bonded alumina mould case and manufacturing method thereof
  • Aluminasol bonded alumina mould case and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Alumina sol bonded alumina formwork for directionally solidified DD6 alloy (composition shown in the table below)

[0066] Element

Cr

co

Mo

W

Ta

Nb

Al

f

Re

Ni

Content / wt%

4.3

9.0

2.0

8.0

7.5

0.5

5.6

0.1

2.0

Remain

[0067] The first step: prepare the formwork slurry

[0068] The mold shell slurry is composed of aluminum sol (LA-25 aluminum sol produced by Zibo Jinqi Chemical), alumina powder, Cr 2 o 3 (mineralizer), ammonium polyacrylate (dispersant), n-octanol (defoamer) and JFC (wetting agent), the content of each component is shown in the table below:

[0069] Element

Aluminum sol

Alumina powder

Cr 2 o 3

ammonium polyacrylate

n-octanol

JFC

Content / wt%

23

71.2

5

0.6

0.1

0.1

[0070] Step Two: Prepare the Formwork

[0071] (A) immerse the wax pattern of casting shape into t...

Embodiment 2

[0093] Pouring Ni 3 Aluminum sol-bonded alumina formwork for Al-based alloys (composition shown in the table below)

[0094] Element

Ni

Al

Mo

Re

Content / wt%

Remain

7.8

12.5

1.5

[0095] The first step: prepare the formwork slurry

[0096] The mold shell slurry is composed of aluminum sol (LA-20 aluminum sol produced by Zibo Jinqi Chemical), alumina powder, MgO (mineralizer), ammonium polyacrylate (dispersant), n-octanol (defoamer) and JFC (wetting agent); the content of each component is shown in the table below:

[0097] Element

Aluminum sol

Alumina powder

MgO

ammonium polyacrylate

n-octanol

JFC

Content / wt%

28

68.3

3

0.5

0.1

0.1

[0098] Step Two: Prepare the Formwork

[0099] (A) immerse the wax pattern of casting shape into the slurry prepared in the first step for 2 seconds and then take it out, sprinkle with 80 mesh alumina sand to for...

Embodiment 3

[0118] Aluminum sol bonded alumina formwork for directionally solidified TMS75 alloy (composition shown in the table below)

[0119] Element

Cr

co

Mo

W

Ta

Al

f

Re

Ni

Content / wt%

3.0

12.0

2.0

6.0

6.0

6.0

0.1

5.0

Remain

[0120] The first step: prepare the formwork slurry

[0121] The mold shell slurry is composed of aluminum sol (LA-25 aluminum sol produced by Zibo Jinqi Chemical), alumina powder, TiO (mineralizer), ammonium polyacrylate (dispersant), n-octanol (defoamer) and JFC (wetting agent); the content of each component is shown in the table below:

[0122] Element

Aluminum sol

Alumina powder

TiO

ammonium polyacrylate

n-octanol

JFC

Content / wt%

24

72

3

0.8

0.1

0.1

[0123] Step Two: Prepare the Formwork

[0124] (A) immerse the wax pattern of the casting shape into the slurry prepared in the...

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Abstract

The invention discloses an aluminasol bonded alumina mould case and a manufacturing method thereof. The slurry of the alumina mould case comprises aluminasol, alumina powder, a mineralizing agent, a dispersing agent, a defoaming agent and a moisturizing agent. In the invention, the alumina mould case is manufactured by using a molten mould precision casting process. The aluminasol bonded alumina mould case of the invention fully utilizes the characteristics of the two materials of aluminasol and alumina at low temperature and high temperature, the morphology of the section of the manufacturedmould case is observed under a scanning electron microscope, and the section has obvious layering structure. The layering structure occurred in the aluminasol bonded alumina mould case is caused by different particle sizes of alumina sands connecting two adjacent layers of the slurry, which is beneficial to interlayer bonding. Thus, the strength of the mould case is increased, the air permeability of the mould case is also increased, and thus, the mould case has enough strength and air permeability when the mould case is used at high temperature.

Description

technical field [0001] The invention relates to a high-temperature alloy investment casting high-temperature alloy mold shell, more particularly, refers to a mold shell suitable for precision casting molding or directional solidification molding or directional solidification molding of smelted high-activity metals and alloys containing high-activity metals. Single crystal grown alumina sol bonded alumina formwork. Background technique [0002] Superalloy is an attractive and excellent structural material, which has the characteristics of low density, high specific strength and good corrosion resistance, and has been widely used in aviation and aerospace fields. However, the new superalloy contains a certain amount of highly active metal elements such as Re, Ru, Hf, Cr, Y, and a relatively high content of Al elements. When using traditional silica sol as a binder to prepare mold shells for precision casting or directional solidification, Often due to highly reactive metals a...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/18B22C9/02
Inventor 唐晓霞吴良策崔永双张虎
Owner BEIHANG UNIV
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