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A kind of yttrium sol bonded yttrium oxide mold shell and preparation method thereof

A technology of yttrium oxide and yttrium sol, which is applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of casting surface or internal pollution, damage to casting quality, etc., and achieve thermal shock resistance, not easy to deform, process Effects with controllable parameters

Active Publication Date: 2011-12-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] High-temperature alloys and many metal functional materials contain more highly active metal elements such as Ti, Nb, and rare earth. When using traditional silica or alumina materials with silica sol as a binder as mold shells for precision casting or directional solidification , often due to highly reactive metals and SiO 2 or Al 2 o 3 surface or internal contamination of the casting, damage the quality of the casting or cause waste

Method used

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  • A kind of yttrium sol bonded yttrium oxide mold shell and preparation method thereof
  • A kind of yttrium sol bonded yttrium oxide mold shell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Yttrium sol-bonded yttrium oxide formwork for directionally solidified Ti-47Al-2Cr-2Nb alloy rods

[0064] The first step: prepare the formwork slurry

[0065] The mold shell slurry is composed of yttrium sol, yttrium oxide powder, defoamer and surfactant, wherein the content of 325 mesh yttrium oxide powder accounts for 79% of the total weight of the slurry, and the content of yttrium sol accounts for 20% of the total weight of the slurry. N-octanol accounts for 0.5% of the total weight of the slurry, and JFC content accounts for 0.5% of the total slurry.

[0066] Step Two: Prepare the Formwork

[0067] (A) immerse the wax pattern of casting shape into the slurry prepared in the first step for 5 seconds and then take it out, sprinkle with 60 mesh yttrium oxide sand to form the first preform;

[0068] (B) placing the first preform in a constant temperature and humidity environment with a temperature of 20° C. and a relative humidity of 60% for 30 hours to obtain a sec...

Embodiment 2

[0087] Yttrium Sol Bonded Yttrium Oxide Formwork for Casting Nb-16Si-22Ti-17Cr-2Hf-2Al Alloy

[0088] The first step: prepare the formwork slurry

[0089] The formwork slurry is composed of yttrium sol, yttrium oxide powder, defoamer and surfactant, wherein the content of 325 mesh yttrium oxide powder accounts for 60% of the total weight of the formwork slurry, and the content of yttrium sol accounts for 60% of the total weight of the formwork slurry. 39.9%, n-amyl alcohol accounts for 0.05% of the total weight of the formwork slurry, and the content of OP-10 accounts for 0.05% of the total formwork slurry.

[0090] Step Two: Prepare the Formwork

[0091] (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 yttrium oxide sand to form the first preform;

[0092] (B) placing the first preform in a constant temperature and humidity environment with a temperature of 35° C. and a relative...

Embodiment 3

[0110] Yttrium Sol Bonded Yttrium Oxide Formwork for Directional Solidification of Nb-16Si-22Ti-2Al-6Hf-2Cr Alloy

[0111] The first step: prepare the formwork slurry

[0112] The formwork slurry is composed of yttrium sol, yttrium oxide powder, defoamer and surfactant, wherein the content of 325 mesh yttrium oxide powder accounts for 65% of the total weight of the formwork slurry, and the content of yttrium sol accounts for the total weight of the formwork slurry. 34%, isopropanol accounts for 0.5% of the total weight of the formwork slurry, and the OP-7 content accounts for 0.5% of the total formwork slurry.

[0113] Step Two: Prepare the Formwork

[0114] (A) immerse the wax pattern of casting shape into the slurry prepared in the first step for 8 seconds and then take it out, sprinkle with 100 mesh yttrium oxide sand to form the first preform;

[0115] (B) placing the first preform in a constant temperature and humidity environment with a temperature of 25° C. and a rela...

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Abstract

The invention discloses a yttrium sol-bonded yttrium oxide formwork and a preparation method thereof. The composition of the yttrium sol-bonded yttrium oxide formwork is all yttrium oxide except for impurities less than 1%, and the impurities may be ZrO2, Al2O3. In the preparation method, the yttrium oxide formwork obtained by slurrying, drying, sanding, dewaxing, and sintering can be used for high-activity metals such as Ti, Nb, and rare earth elements or alloys containing high-activity metals at a service temperature of 2000 ° C. Precision casting, directional solidification. In the process of high-temperature precision casting and directional solidification parts preparation, the yttrium sol-bonded yttrium oxide formwork does not react with highly active metals, and the casting surface is smooth without sand sticking, so good-quality castings can be obtained.

Description

technical field [0001] The invention relates to a mold shell, more particularly, to a yttrium sol-bonded yttrium oxide mold shell suitable for forming smelted high-activity metals and alloys containing high-activity metals. Background technique [0002] The formwork used for investment casting or directional solidification generally needs to have high chemical stability, good high temperature strength, good thermal shock resistance, and the formwork should not be deformed during the melting process. [0003] Highly active metals such as titanium, aluminum, niobium, and rare earth elements have high chemical activity, and are easy to react with the mold shell material during precision casting or directional solidification, forming a contamination layer on the surface of the workpiece, and forming inclusions inside the workpiece. Thus affecting the mechanical properties of the workpiece. [0004] Titanium alloy is an attractive and excellent structural material, which has the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/02C04B35/505C04B35/622
Inventor 张虎崔永双唐晓霞高明
Owner BEIHANG UNIV
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