Preparation method of oxide doped and modified Y2O3+YSZ high-temperature-resisting shell

A high temperature resistant type and oxide technology, applied in casting molding equipment, casting molds, cores, etc., can solve the problems of high temperature strength and thermal shock resistance, high price of powder materials, and high temperature of sintering ceramics, reducing the The degree of reaction, reducing the cost of the shell, and the effect of small interface reaction

Inactive Publication Date: 2014-07-30
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, yttrium oxide also has disadvantages such as high price of powder materials, high temperature of sintering into porcelain, easy hydration and gelation of slurry, etc.
Yttrium-stabilized zirconia has the characteristics of high melting point, high high-temperature strength, thermal shock resistance, and relatively cheap price. However, it has the problem of reacting with elements such as Nb, Ti, Si, and Hf at high temperatures.

Method used

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  • Preparation method of oxide doped and modified Y2O3+YSZ high-temperature-resisting shell
  • Preparation method of oxide doped and modified Y2O3+YSZ high-temperature-resisting shell
  • Preparation method of oxide doped and modified Y2O3+YSZ high-temperature-resisting shell

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Experimental program
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Effect test

Embodiment 1

[0047] Example 1: Preparation of three different contents of CaO-doped modified Y 2 o 3 +YSZ high temperature resistant shell, the process and steps in this embodiment are as follows:

[0048] (1) Preparation of slurry: Weigh the equivalent amount of yttrium sol in three measuring cups, stir at a constant speed, and add the wetting agent JFC (fatty alcohol polyoxyethylene ether) respectively, the addition amount is 5‰ of the yttrium sol, and then prepare three kinds of electrofusion The mixed powder of yttrium oxide and calcium oxide, wherein the mass percentage of CaO is 0.12%, 1.41% and 2.69% respectively, and the particle size of the mixed powder is 325 meshes. The three mixed powders are respectively added to the yttrium sol being stirred, and then added Defoamer n-octanol, added in an amount of 5‰ of yttrium sol, stirred for 15 minutes to obtain three kinds of slurry with different contents of CaO;

[0049] (2) Prepare the mold shell: immerse the wax mold in the three k...

Embodiment 2

[0054] Embodiment 2: prepare three kinds of different content La 2 o 3 Doping Modified Y 2 o 3 +YSZ high temperature resistant shell, the process and steps in this embodiment are as follows:

[0055] (1) Preparation of slurry: Weigh three equal amounts of yttrium sol in three measuring cups, stir at a constant speed, and add the wetting agent JFC (fatty alcohol polyoxyethylene ether) respectively, the addition amount is 3‰ of the yttrium sol, and then prepare three kinds of electrofusion Mixed powder of yttrium oxide and lanthanum oxide, where La 2 o 3 The mass percentages are respectively 0.72%, 10.51% and 20.3%, and the particle size of the mixed powder is 325 meshes. The three mixed powders are respectively added to the yttrium sol being stirred, and then the defoamer n-octanol is added in an amount of yttrium 3‰ of the sol, three different contents of La were obtained after stirring for 9.5 minutes 2 o 3 slurry;

[0056](2) Prepare the mold shell: immerse the wax m...

Embodiment 3

[0061] Embodiment 3: Prepare three kinds of different contents of MgO+CaO doped modified Y 2 o 3 +YSZ high temperature resistant shell, the process and steps in this embodiment are as follows:

[0062] (1) Preparation of slurry: Weigh the same amount of yttrium sol in three measuring cups, stir at a constant speed, and add the wetting agent JFC (fatty alcohol polyoxyethylene ether) respectively. The mixed powder of yttrium oxide and MgO+CaO, wherein the mass percentage of MgO+CaO is 0.1%+0.1%, 1%+1.4% and 2.1%+2.9% respectively, the particle size of the mixed powder is 325 mesh, and the three kinds are mixed Add the powder to the stirring yttrium sol respectively, and then add the defoamer n-octanol in an amount of 1‰ of the yttrium sol. After stirring for 15 minutes, three kinds of slurries with different contents of MgO+CaO are obtained;

[0063] (2) Prepare the mold shell: immerse the wax mold in the three kinds of slurry for 10 seconds, then take it out, and sprinkle san...

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Abstract

The invention relates to a preparation method of an oxide doped and modified Y2O3+YSZ high-temperature-resisting shell. The preparation method comprises the following steps: preparing mixed powder of yttrium oxide and doped oxide and yttrium sol into slurry; coating, coating, stuccoing and drying; repeating the above steps for many time; then dewaxing so as to prepare a shell, and then sintering so as to form a finished product. The shell or a cruicible is suitable for smelting, precision casting and directional solidification of high-activity alloys and refractory metal at a high temperature of 1500-2000 DEG C, has the characteristics of low interface reaction, good deformability, high intensity, easy forming and capability of selecting types of doped oxides and dopping content according to the actual alloy components, and is more economical and has better technology property and thermal shock resistance as compared with pure yttrium oxide shells.

Description

technical field [0001] The invention belongs to the field of high-temperature-resistant ceramic shell material molding technology, and specifically relates to an oxide-doped modified Y 2 o 3 The preparation method of +YSZ high temperature resistant shell. Background technique [0002] At present, there are mainly the following types of shell preparation methods for the melting or precision casting of refractory and highly active metals such as superalloys: [0003] For titanium alloys, the surface coating of the shell mainly uses zirconium sol, zirconium diacetate, etc. as the binder, and the zirconia or high-purity zirconia stabilized by Mg and Ca is remelted twice as the surface layer or the refractory surface layer. Material, fused corundum is the refractory material for the middle layer and the back layer, and the above single binder and refractory material are used to prepare coatings for coating and hanging, and then sand and dry accordingly. Repeat this several time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C1/00
Inventor 郭喜平王寅乔彦强
Owner NORTHWESTERN POLYTECHNICAL UNIV
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