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Yttrium oxide doping zirconium oxide crucible and producing method thereof by using hot pressing sintering

A technology of hot pressing sintering and yttrium oxide, which is applied in the field of crucibles for vacuum smelting highly active metals and hot pressing sintering crucibles. It can solve the problems of large volume change, difficult shape of yttrium oxide ceramics, and reduce the use temperature of products, and achieve high smoothness. , The shape is simple, the effect of improving the purity

Inactive Publication Date: 2008-08-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the shape of yttrium oxide ceramics in industrial production is difficult, and the volume changes greatly during sintering. Therefore, in the traditional refractory preparation process, yttrium oxide only exists in the form of additives. The solid phase volume fraction in yttrium oxide ceramics is less than 25%, which is greatly reduced. The temperature of the product

Method used

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  • Yttrium oxide doping zirconium oxide crucible and producing method thereof by using hot pressing sintering
  • Yttrium oxide doping zirconium oxide crucible and producing method thereof by using hot pressing sintering

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Embodiment 1

[0036] Manufacture a yttria-doped zirconia crucible capable of melting 0.5Kg titanium Ti alloy

[0037] The target composition of this yttria-doped zirconia crucible is 368 g of yttria Y 2 o 3 Doped with 38g of zirconia.

[0038] The steps of preparing the crucible of the target composition by hot pressing and sintering are as follows:

[0039] The first step: making slurry

[0040] 80% of the Y particles with a particle size of 4.8 μm formulated according to the target composition 2 o 3 , 80% ZrO with a particle size of 5.0 μm 2 Mix with absolute ethanol to prepare a slurry; the amount of absolute ethanol is 0.5L;

[0041] The second step: drying the billet

[0042] Dry the slurry prepared in the first step in a constant temperature drying box to obtain a billet, the drying temperature is 60°C, and the drying time is 15 hours;

[0043] The third step: making crucible by hot pressing and sintering

[0044] Put the blank obtained in the second step into the mold cavity...

Embodiment 2

[0048] Manufacture a multi-grade yttrium oxide-doped zirconia crucible capable of melting 0.5Kg titanium Ti alloy

[0049] The target composition of this yttria-doped zirconia crucible is 368 g of yttria Y2 o 3 Doped with 38g of zirconia.

[0050] The steps of preparing the crucible of the target composition by hot pressing and sintering are as follows:

[0051] The first step: making slurry

[0052] Select 0.02μm first grade Y according to the target composition 2 o 3 Fine powder, 1μm second grade Y 2 o 3 Fine powder, 5μm third grade Y 2 o 3 Fine powder, 15μm fourth grade Y 2 o 3 Fine powder, of which, the first grade Y 2 o 3 Fine powder accounted for total Y 2 o 3 5% of the amount of powder, the second grade Y 2 o 3 Fine powder accounted for total Y 2 o 3 20% of the amount of powder, the third grade Y 2 o 3 Fine powder accounted for total Y 2 o 3 30% of the amount of powder, the fourth grade Y 2 o 3 Fine powder accounted for total Y 2 o 3 45% of the ...

Embodiment 3

[0060] Manufacture a yttrium oxide doped zirconia crucible capable of melting 1Kg hafnium Hf alloy

[0061] The target composition of this yttria-doped zirconia crucible is 550 g of yttria Y 2 o 3 Doped with 50g of zirconia.

[0062] The steps of preparing the crucible of the target composition by hot pressing and sintering are as follows:

[0063] The first step: making slurry

[0064] 90% of the Y particles with a particle size of 15 μm formulated according to the target composition 2 o 3 , 80% ZrO with a particle size of 10 μm 2 Mix with absolute ethanol to prepare a slurry; the amount of absolute ethanol is 1L;

[0065] The second step: drying the billet

[0066] Dry the slurry prepared in the first step in a drying oven to obtain a billet at a drying temperature of 80°C and a drying time of 8 hours;

[0067] The third step: making crucible by hot pressing and sintering

[0068] Put the blank obtained in the second step into the mold cavity of the hot pressing equ...

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Abstract

The present invention discloses an yttrim oxide doping zirconium oxide crucible and a method adopting the hot pressing sintering crucible, the component of the yttrium oxide doping zirconium crucible is that the zirconium oxide with 0.2-1.5g is doped in each 10g of yttrium oxide Y2O3. The grain diameter of the yttrim oxide Y2O3 for hot pressing sintering is 0.01-20 mu m, and the grain diameter of yttrim oxide ZrO2 is 0.01-20 mu m. The using temperature of the yttrium oxide doping yttrim oxide crucible of the invention is 1600-2000 DEG C, and the crucible is taken as the apparatus of vacuum melting in the temperature surrounding, the inner surface of the crucible does not take part in the reaction of the active metal or alloy thereby increasing the purity of the flux.

Description

technical field [0001] The present invention relates to a kind of metal smelting equipment, more particularly, refers to a kind of crucible which can be used for vacuum smelting highly active metals (Ti, Nb, Hf and other metals or alloys) and its method of making the crucible by hot pressing and sintering. Background technique [0002] The crucible materials used for vacuum melting highly active metals are mainly calcium oxide CaO, magnesium oxide MgO, boron nitride BN, calcium fluoride CaF 2 etc. The operating temperature of the crucible is generally 1200-1500°C, which is difficult for melting Ti, Nb, Hf and other metals or alloys. [0003] Yttrium oxide (Y 2 o 3 ) Ceramic is a high-performance transparent ceramic with excellent heat resistance, corrosion resistance and high temperature stability. The melting point of yttrium oxide is greater than 2400°C, and it is difficult to react with some active metals (such as titanium, aluminum, etc.) at high temperatures, so it c...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/48C04B35/622C22B9/04
Inventor 徐惠彬高明龚路杰唐晓霞张虎
Owner BEIHANG UNIV
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