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A CaO refractory material used for a hydration-resisting crucible and a preparing method of the crucible

A refractory material and anti-hydration technology, which is applied in the field of preparation of CaO refractory materials for anti-hydration crucibles and crucibles, and can solve the problems of easy decomposition of films and limited product performance

Inactive Publication Date: 2016-05-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some surface treatment methods can improve the hydration resistance of CaO refractories to a certain extent, but they have not fundamentally solved the problem of easy hydration of CaO materials, and the film formed on the surface is easy to decompose when heated, which limits the performance of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The waterproof calcium oxide refractory material component provided by the present invention is as follows: (mol percentage)

[0013] Calcium oxide powder is 99%, yttrium oxide powder is 1%, and all raw materials are industrially pure.

[0014] Weigh a certain amount of calcium oxide and yttrium oxide according to the above ratio, put the mixture into a non-aqueous organic solvent (such as: alcohol, ether), and press the mold after 30 minutes of ball milling; , sintered for 6 hours, and then heated up to 1750°C for 12 hours, sintered for 3 hours, and cooled to room temperature for 12 hours to obtain a finished crucible.

[0015] The obtained waterproof calcium oxide refractory crucible: the hydration rate (49 days) is 0.2%.

Embodiment 2

[0016] Embodiment 2: The composition of the waterproof calcium oxide refractory material provided by the invention is as follows: (molar percentage)

[0017] Calcium oxide powder 94%, yttrium oxide powder 6%. All raw materials are industrially pure.

[0018] Weigh a certain amount of calcium oxide and yttrium oxide according to the above ratio, put the mixture into a non-aqueous organic solvent (such as: alcohol, ether), and press the mold after 30 minutes of ball milling; , sintered for 6 hours, and then heated up to 1750°C for 12 hours, sintered for 3 hours, and cooled to room temperature for 12 hours to obtain a finished crucible.

[0019] The obtained waterproof calcium oxide refractory material: its bulk density is about 3.34g / cm 3 ; Hydration rate (28 days) is 0.22%.

Embodiment 3

[0020] Embodiment 3: The composition of the waterproof calcium oxide refractory material provided by the invention is as follows: (molar percentage)

[0021] Calcium oxide powder 92%, yttrium oxide powder 8%. All raw materials are industrially pure.

[0022] Weigh a certain amount of calcium oxide and yttrium oxide according to the above ratio, put the mixture into a non-aqueous organic solvent (such as: alcohol, ether), and press the mold after 60 minutes of ball milling; then put the molded sample at 600 ° C , sintered for 8 hours, and then heated to 1750°C for 12 hours, sintered for 5 hours, and cooled to room temperature for 12 hours to obtain a finished crucible.

[0023] The obtained waterproof calcium oxide refractory material: its bulk density is about 3.34g / cm 3 ; Hydration rate (28 days) is 0.22%.

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Abstract

The invention relates to a CaO refractory material used for a hydration-resisting crucible and a preparing method of the crucible. The material comprises 92-99 mol% of calcium oxide and 1-8 mol% of yttrium oxide. Under the premise of not destroying properties of the CaO, the YaO3 which is an additive is introduced to improve hydration resistance and sintering properties of the CaO refractory material so as to obtain the better crucible refractory material for titanium alloy melting. Hydration tests (in atmosphere, at 25-30 DEG C, with humidity being 65-75%) prove that the 28-day weight gain of the crucible is less than 0.2%.

Description

technical field [0001] The invention relates to a CaO refractory material for a hydration-resistant crucible and a preparation method for the crucible. technical background [0002] With the high quality of molten steel, higher requirements are put forward for related refractory materials, especially the requirement that refractory materials cannot pollute molten steel. CaO refractories not only do not pollute molten steel but also can capture oxide inclusions in molten steel, have the effect of purifying molten steel, and are rich in resources and low in price; in addition, CaO refractories also have certain advantages in smelting titanium alloys, but CaO in the air It is very easy to hydrate in the medium, so its use is limited. [0003] Although various techniques to prevent CaO hydration have been developed, hydration is still inevitable. Some surface treatment methods can improve the hydration resistance of CaO refractories to a certain extent, but they have not funda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/057C04B35/64
CPCC04B35/66C04B35/057C04B35/64C04B2235/3225C04B2235/6567C04B2235/661C04B2235/77
Inventor 李重河鲁雄刚孟繁龙陈光耀林崇茂汪宏斌秦子威
Owner SHANGHAI UNIV