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Porous ceramic, binder thereof, preparation methods of two and application of porous ceramic

A technology for porous ceramics and binders, applied in the field of ceramic materials, can solve problems such as filter material damage, and achieve the effects of small pore size, good chemical stability, high-temperature mechanical properties, and a simple preparation method

Pending Publication Date: 2022-01-28
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the production efficiency, it is necessary to increase the passing pressure of the aluminum liquid, and the higher pressure will easily lead to the damage of the filter material

Method used

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  • Porous ceramic, binder thereof, preparation methods of two and application of porous ceramic
  • Porous ceramic, binder thereof, preparation methods of two and application of porous ceramic

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preparation example Construction

[0042] The preparation method of the binder of the porous ceramic provided by the embodiment of the present application includes:

[0043] Calcining the reaction raw materials at 1200-1350°C for at least 5 minutes to obtain a binder, the components of the binder include: Al 2 o 3 : 5 to 50%, SiO 2 : 5~33%, alkaline earth metal oxide 2~50%, B 2 o 3 : 1 to 43%, the alkaline earth metal oxide is at least one or a mixture of two of CaO and MgO;

[0044] Al 2 o 3 , SiO 2 , alkaline earth metal oxides and B 2 o 3 The sum of the contents is at least 90.5%, and when there is a balance in the components, the balance includes impurities or reinforcing components. It should be noted that the balance refers to the Al in the composition 2 o 3 , SiO 2 , alkaline earth metal oxides and B 2 o 3 That part where the sum of the contents is less than 100%.

[0045] Al 2 o 3 and SiO 2 It is the main component of the adhesive and the main forming phase of the adhesive layer. Al 2...

Embodiment 1

[0083] This embodiment provides a method for preparing porous ceramics, and the ceramic particles are made of 12-mesh white corundum. The content of alumina in white corundum is more than 99%. The chemical composition of the binder is: SiO 2 : 22%, CaO: 10%, MgO: 24%, B 2 o 3 : 22%, TiO 2 : 1.8%, Na 2 O: 0.5%, ZnO: 0.5%, the balance is Al 2 o 3 . The purity of each raw material is close to 100%.

[0084] Step S1, preparation of binder

[0085] Mix the reaction raw materials thoroughly and evenly according to the components of the above-mentioned binder. Put the mixed raw materials into a high-temperature furnace for calcination. The calcination temperature is 1250° C. for 10 minutes. The raw materials are partially melted and interdiffused to form lumps. The reactant is crushed and ground into powder by a crushing powder machine, and the powder passes through a 200-mesh sieve to obtain adhesive powder for the next step.

[0086] Step S2, mixing

[0087] Water glass...

Embodiment 2

[0092] This embodiment provides a preparation method of porous ceramics. The ceramic particles are made of 4-mesh brown corundum. The content of alumina in brown corundum is more than 95%. The chemical composition of the binder includes by weight percentage: SiO 2 : 20%, CaO: 10%, MgO: 25%, B 2 o 3 : 28%, TiO 2 : 1.0%, Na 2 O: 0.4%, ZnO: 0.6%, the balance is Al 2 o 3 . The purity of each raw material is close to 100%.

[0093] Step S1, preparation of binder

[0094] Thoroughly mix the above binder raw materials evenly. The mixed raw materials are put into a high-temperature furnace for calcination. The calcination temperature is 1350° C. for 9 minutes. The raw materials are partially melted and interdiffused to agglomerate. Use a crushing powder machine to crush and grind the binder into powder, and the powder passes through a 200-mesh sieve to obtain binder powder for the next step.

[0095] Step S2, mixing

[0096] Use water glass as the adhesive, and the modulu...

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Abstract

The invention relates to the technical field of ceramic materials, and discloses porous ceramic, a binder thereof, preparation methods of the two and application of the porous ceramic. The preparation method of the binder of the porous ceramic comprises the following steps: calcining reaction raw materials at 1200-1350 DEG C to obtain the binder, wherein the binder comprises the following components in percentage by mass: 5-50% of Al2O3, 5-33% of SiO2, 2-50% of alkaline earth metal oxide and 1-43% of B2O3, and the sum of the content of Al2O3, SiO2, alkaline earth metal oxide and B2O3 is at least 90.5%. The binder of the porous ceramic is prepared by adopting the above preparation method. The preparation method of the porous ceramic comprises the following steps: uniformly mixing 5-28 parts of the binder and 100 parts of ceramic particles, pressing and sintering. The porous ceramic is prepared by the preparation method. The porous ceramic has excellent low-temperature mechanical properties and can be applied to filtration and purification of aluminum alloy melt.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to porous ceramics and their binders as well as their preparation methods and applications. Background technique [0002] Aluminum ingots used in high-quality aluminum products (such as packaging materials, sheets and plates for aerospace and ships, printed products, etc.) require high purity of aluminum liquid and no inclusions. These inclusions seriously reduce the key properties of ingots and their products, such as calenderability, strong plasticity, fatigue performance, welding performance, polishing performance, corrosion resistance, and stress corrosion cracking resistance. Effectively reducing oxide inclusions in the melt and improving the quality of castings is an inevitable trend for the high-quality development of the aluminum alloy industry. [0003] So far, it is a common practice to use porous ceramic filter materials to remove inclusions from aluminum alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/10C04B35/565C04B35/622C04B35/63C22B21/06C22C1/02
CPCC04B38/0051C04B35/10C04B35/565C04B35/622C04B35/6303C04B35/6316C22B21/066C22C1/02C04B2235/96C04B2235/3418C04B2235/3208C04B2235/3206C04B2235/3409C04B2235/3217C04B2235/3232C04B2235/3201C04B2235/3284
Inventor 骆智超路建宁林颖菲王娟郑开宏
Owner GUANGDONG INST OF NEW MATERIALS
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