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A kind of edge sealing method of ceramic foam filter for casting

A foamed ceramic and filter technology, which is applied in chemical instruments and methods, separation methods, filtration and separation, etc., can solve the problems of reducing the effective filtration area of ​​the filter, complicated process operations, and edge-sealing slurry crowding, etc., to reduce the number of casting clips Sand defects, simple process operation, low cost effect

Active Publication Date: 2021-12-10
浙江金琨西立锆珠有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the above-mentioned skin grafting and edge trimming process, although the edge sealing operation can be completed on the side of the honeycomb (or foam) ceramic filter, it will inevitably cause the defect that the edge sealing slurry will occupy the internal pores of the ceramic filter, thus reducing the filtration efficiency. The effective filter area of ​​the filter may also cause the problem of incomplete edge banding caused by the direct edge banding of the slurry, and its process operation is relatively complicated

Method used

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  • A kind of edge sealing method of ceramic foam filter for casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Taking the edge banding of a zirconia foam ceramic filter as an example, first use a laser cutting machine to cut a number of 15PPI polyurethane foam original sheets with a diameter of 40mm and a side height of 30mm, and then perform surface treatment by flocking. After the original foam sheet is flocked, it is dried in an oven at 60°C for 2 hours. At the same time, prepare zirconia ceramic slurry: mix the components of the synthetic slurry in the following weight ratio: liquid aluminum dihydrogen phosphate: alumina: zirconia: xanthan gum: pure water=80:480:120:160 : 1, then the above-mentioned mixture was put into a ball mill tank for ball milling for 2 hours, and the slurry after the ball milling was passed through a 250 mesh sieve to obtain a slurry. Then, the flocked foam original sheet is subjected to a paste treatment, and the flocked foam original sheet is put into an oven and dried at 80° C. for 2 hours to form a foam ceramic filter blank.

[0046] Then cut out...

Embodiment 2

[0048] Taking the edge banding of a zirconia foam ceramic filter as an example, first use a laser cutting machine to cut a number of 20PPI polyurethane foam original sheets with a diameter of 50mm and a side height of 20mm, and then perform surface treatment by flocking. After the original foam sheet is flocked, it is dried in an oven at 80°C for 2 hours. At the same time, prepare zirconia ceramic slurry: mix the components of the synthetic slurry in the following weight ratio: liquid aluminum dihydrogen phosphate: alumina: zirconia: xanthan gum: pure water=80:480:120:160 : 1, then the above-mentioned mixture was put into a ball mill tank for ball milling for 2 hours, and the slurry after the ball milling was passed through a 250 mesh sieve to obtain a slurry. Then, the flocked foam original sheet is subjected to a paste treatment, and the flocked foam original sheet is put into an oven and dried at 80° C. for 2 hours to form a foam ceramic filter blank.

[0049] Then cut out...

Embodiment 3

[0051] Taking the edge banding of a zirconia foam ceramic filter as an example, first use a laser cutting machine to cut a number of 20PPI polyurethane foam original sheets of rectangular parallelepiped with a surface length and width of 50mm and a side height of 20mm, and then flock them. surface treatment. After the original foam sheet is flocked, it is dried in an oven at 80°C for 2 hours. At the same time, prepare zirconia ceramic slurry: mix the components of the synthetic slurry in the following weight ratio: liquid aluminum dihydrogen phosphate: alumina: zirconia: xanthan gum: pure water=80:480:120:160 : 1, then the above-mentioned mixture was put into a ball mill tank for ball milling for 2 hours, and the slurry after the ball milling was passed through a 250 mesh sieve to obtain a slurry. Then, the flocked foam original sheet is subjected to a paste treatment, and the flocked foam original sheet is put into an oven and dried at 75° C. for 2 hours to form a foam ceram...

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Abstract

The invention relates to an edge sealing method for a foam ceramic filter for casting, which is characterized in that a layer of slurry protection layer is hung around the filter, sintered and densely connected with the foam ceramic at high temperature to form a whole, and the edge sealing layer needs to be First wrap the edge tightly with a film, then apply the slurry evenly on the outside of the film, then dry it, and then calcine it at a high temperature. . The present invention wraps the cladding layer on the unsealed foam ceramic filter, and then coats the edge-seal slurry on the outer surface of the cladding layer for drying to prepare the edge seal for the side of the foam ceramic filter, avoiding the During the edge banding operation, the edge banding slurry occupies the internal pores of the foam ceramic filter, which improves the effective filtration area of ​​the filter; by spraying the slurry evenly on the coating layer of an appropriate size, it can avoid the direct edge banding of the slurry Uneven spraying, incomplete edge banding, and uneven spraying.

Description

technical field [0001] The invention relates to the technical field of casting industry appliances, in particular to an edge sealing method for a foam ceramic filter for casting. Background technique [0002] With the development of the foundry industry, various filters for filtering liquid metals have appeared on the existing market, among which, ceramic foam filters are widely used due to their good filtering effect. The ceramic foam filter is to immerse the polyurethane foam into the paint composed of ceramic powder, binder, sintering aid, suspending agent, etc., and then squeeze out the excess paint, so that the ceramic paint is evenly coated on the polyurethane foam to form a green body. , and then the green body is dried and roasted at high temperature. The foam ceramic filter screen efficiently filters out large inclusions and most of the tiny suspended inclusions in liquid metal through three filtration and purification mechanisms: mechanical interception, rectifica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/20
CPCB01D39/20
Inventor 王路科胡法卿范宇升
Owner 浙江金琨西立锆珠有限公司
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