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Composite multilevel Y2O3 powder crucible and method for producing the same with isostatic pressing technique

A crucible and process technology, applied in the field of metal smelting equipment, can solve the problems of difficult modeling of yttrium oxide ceramics, large volume change, lowering the use temperature of products, etc., and achieve the effects of simple modeling, high smoothness, and increased density

Inactive Publication Date: 2008-10-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Composite multilevel Y2O3 powder crucible and method for producing the same with isostatic pressing technique
  • Composite multilevel Y2O3 powder crucible and method for producing the same with isostatic pressing technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: Manufacture a composite multi-stage Y alloy capable of melting 3Kg of Nb-16Si-17Cr 2 o 3 Powder crucible (the weight of the crucible is 2Kg)

[0048] Composite multi-stage Y 2 o 3 The size of the powder crucible: the inner diameter of the crucible is 12cm, and the height of the crucible is 17cm.

[0049] The binder is a polyvinyl alcohol solution with a mass percent concentration of 10%.

[0050] In this example, composite multi-stage Y was prepared by isostatic pressing process. 2 o 3 The steps of powder crucible are:

[0051] Step 1: Prepare crucible raw materials

[0052] Weigh 30g of the first stage Y according to the target composition of the crucible's self-weight 2Kg 2 o 3 Powder, 70g of the second grade Y 2 o 3 Powder material, 500g third grade Y 2 o 3 Powder material, 600g fourth grade Y 2 o 3 Powder, 800g fifth grade Y 2 o 3 The powder is mechanically stirred to obtain a compound multi-stage Y 2 o 3 Powder material; then in the ...

Embodiment 2

[0066] Example 2: Manufacture a composite multi-stage Y that can melt 2.5Kg of Ti-6Al-4V alloy 2 o 3 Powder crucible (the weight of the crucible is 2Kg)

[0067] Composite multi-stage Y 2 o 3 The size of the powder crucible: the inner diameter of the crucible is 12cm, and the height of the crucible is 17cm.

[0068] The binder is: silica sol.

[0069] In this example, composite multi-stage Y was prepared by isostatic pressing process. 2 o 3 The steps of powder crucible are:

[0070] Step 1: Prepare crucible raw materials

[0071] Weigh 40g of the first stage Y according to the target composition of the crucible's self-weight 2Kg 2 o 3 Powder, 60g of the second grade Y 2 o3 Powder material, 450g third grade Y 2 o 3 Powder material, 700g fourth grade Y 2 o 3 Powder, 750g fifth grade Y 2 o 3 The powder is mechanically stirred to obtain a compound multi-stage Y 2 o 3 Powder material; then in the composite multi-stage Y 2 o 3 Add 80ml of binder to the powder m...

Embodiment 3

[0082] Example 3: Manufacture a composite multi-stage Y alloy capable of melting 8Kg Ti-47Al alloy 2 o 3 Powder crucible (the weight of the crucible is 4Kg)

[0083] Composite multi-stage Y 2 o 3 The size of the powder crucible: the inner diameter of the crucible is 12cm, and the height of the crucible is 50cm.

[0084] The binder is (group A binder): 130ml of polyvinyl alcohol solution with a concentration of 10% by mass and 30ml of absolute ethanol.

[0085] In this example, composite multi-stage Y was prepared by isostatic pressing process. 2 o 3 The steps of powder crucible are:

[0086] Step 1: Prepare crucible raw materials

[0087] Weigh 80g of the first stage Y according to the target composition of the crucible's self-weight 4Kg 2 o 3 Powder material, 120g of the second grade Y 2 o 3 Powder material, 1000g third grade Y 2 o 3 Powder, 1000g fourth grade Y 2 o 3 Powder material, fifth grade Y of 1800g 2 o 3 The powder is mechanically stirred to obtain...

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Abstract

The invention discloses a composite multi-level Y2O3 crucible and a method for preparing the same by an isostatic pressing process. The multi-level Y2O3 crucible is prepared from multi-level Y2O3 powder and binder, wherein 20-100 ml of the binder is added to 1,000g of the composite multi-level Y2O3. During the preparation process, Y2O3 powders with different particle diameters are mixed, and small particles enter the voids of large particles during the mixing; therefore, the density of the Y2O3 crucible is increased, and the volume change when sintering at a high temperature is reduced. The prepared Y2O3 crucible can be used for smelting high-melting point active metal or alloy at 1,600-2,000 DEG C.

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 the method for making the crucible by isostatic pressing process . 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. Y 2 o 3 Its melting point is greater than 2400°C, and it is difficult to react with some active metals (such as Ti, Nb, Hf and other metals or alloys) at high temperatures...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/505
Inventor 徐惠彬张虎高明唐晓霞宫声凯
Owner BEIHANG UNIV
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