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Saggar for roller kiln for soft ferromagnet production and preparation method of saggar

A technology of soft magnets and roller kiln, which is applied in applications, household utensils, ceramic products, etc. It can solve the problems of affecting the appearance quality of ferrite soft magnets, circular cracks on the surface, and the inability to continue to use. The preparation method is simple and feasible. , less reaction, easy to achieve effect

Inactive Publication Date: 2019-04-05
无锡顺佳特种陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Replaced with a cordierite refractory sagger with better thermal shock resistance (1100°C water cooling, 30-35 times of cracking), although the sagger did not break, it was severely deformed after 30 times of use, which directly affected the appearance of the ferrite soft magnet quality, can not continue to use
In addition, after these two kinds of saggers are used, there will be serious corrosion marks on the surface of the bowl body, and circular cracks will appear on the surface

Method used

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  • Saggar for roller kiln for soft ferromagnet production and preparation method of saggar
  • Saggar for roller kiln for soft ferromagnet production and preparation method of saggar
  • Saggar for roller kiln for soft ferromagnet production and preparation method of saggar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 30 parts of 2-1mm sintered mullite, 10 parts of 1-0mm sintered mullite, 15 parts of 1-0mm andalusite, 2.5 parts of 325 mesh kaolin, 19 parts of 325 mesh low-sodium alumina, 1500 mesh active oxidation 8 parts of aluminum, 15 parts of 325-mesh aluminum-rich spinel, 0.5 part of zirconia refractory fiber, plus 0.4 part of dextrin and 0.5 part of calcium lignosulfonate, put it into the mud mixer, at 15 rpm Speed, stir for 5-10 minutes, add 12 parts of water, stir and mix for 20 minutes, discharge, put into the raw material barrel, and leave for 24 hours to trap the material. Use a friction press to form, with a pressure of 2-5 tons, and hit 10-15 times to form. After standing for 24 hours to dry naturally, the green body enters the drying room for drying at 110°C for 24 hours. Then put the sagger into a high-temperature kiln for firing at 1420°C for 4 hours. For the entire process, see figure 1 .

[0027]It can be seen from Table 1 that the proportion of raw materi...

Embodiment 2

[0032] Weigh 30 parts of 2-1mm sintered mullite, 10 parts of 1-0mm sintered mullite, 15 parts of 1-0mm andalusite, 2.5 parts of 325 mesh kaolin, 19 parts of 325 mesh low-sodium alumina, 1500 mesh active oxidation 8 parts of aluminum, 25 parts of 325-mesh alumina-rich spinel, 0.5 part of zirconia refractory fiber, 0.4 part of dextrin and 0.5 part of calcium lignosulfonate are put into the mud mixer, and the Speed, stir for 5-10 minutes, add 12 parts of water, stir and mix for 20 minutes, discharge, put into the raw material barrel, and leave for 24 hours to trap the material. The raw material becomes dry due to the hydration of aluminum-rich spinel, and its fluidity is poor. After replenishing 1% of the water, it is formed by a friction press with a pressure of 2-5 tons and 10-15 blows. The green body is left to stand for 24 hours, and then enters the drying room for drying at 110°C for 24 hours. Then put the sagger into a high-temperature kiln for firing at 1420°C for 4 hours...

Embodiment 3

[0037] Weigh 30 parts of 2-1mm sintered mullite, 10 parts of 1-0mm sintered mullite, 15 parts of 1-0mm andalusite, 2.5 parts of 325 mesh kaolin, 12 parts of 325 mesh low-sodium alumina, 1500 mesh active oxidation 15 parts of aluminum, 15 parts of 325-mesh aluminum-rich spinel, 0.5 part of zirconia refractory fiber, plus 0.4 part of dextrin and 0.5 part of calcium lignosulfonate, put it into the mud mixer, at 15 rpm Speed, stir for 5-10 minutes, add 12 parts of water, stir and mix for 20 minutes, discharge, put into the raw material barrel, and leave for 24 hours to trap the material. Use a friction press to form, with a pressure of 2-5 tons, and hit 10-15 times to form. The green body is left to stand for 24 hours, and then enters the drying room for drying at 110°C for 24 hours. Then put the sagger into a high-temperature kiln for firing at 1420°C for 4 hours.

[0038] This example mainly investigates the impact of low-sodium alumina and activated alumina on product perform...

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Abstract

The invention discloses a saggar for a roller kiln for soft ferromagnet production and a preparation method of the saggar. The saggar is prepared from, by weight, 30-50 parts of sintered mullite, 10-20 parts of andalusite, 0.1-1 part of zirconium oxide fibers, 1-5 parts of kaolin, 15-25 parts of low-sodium aluminum oxide, 5-10 parts of activated aluminum oxide, 10-20 parts of aluminum-rich spinel,0.2-0.6 part of dextrin and 0.2-0.8 part of calcium lignosulfonate. The saggar is high in thermal shock resistance stability and high in refractoriness under load, the surface SiO2 content of the saggar can be reduced, and reaction between the saggar and soft ferromagnet is reduced; according to utilization in a soft ferromagnet calcining kiln, no adverse reaction is caused to products, deformation in a utilization process is avoided, and in a late utilization period, although small cracks probably occur, the saggar is high in integral strength and still can be used, and the service life is prolonged from 3 months to 5 months; in addition, the preparation method is simple, feasible and easy to implement.

Description

technical field [0001] The invention relates to a sagger and a preparation method thereof, in particular to a sagger for a roller kiln for producing ferrite soft magnets and a preparation method thereof. Background technique [0002] The firing temperature of ferrite soft magnet materials is generally between 900°C and 1450°C. The length of most firing kilns is 30-40 meters, and the cycle time of products in the kiln is 20-35 hours. The temperature gradient per unit length becomes smaller. In order to prevent the product from scattering, the firing of ferrite soft magnets generally uses a refractory sagger as a carrier, because the mullite sagger has high thermal shock resistance (1100°C water cooling, 15-20 cracks) and high Softening temperature under load (1470°C, deformation 0.6%), most manufacturers generally choose mullite saggers. However, for the shorter fast roller kiln for firing ferrite soft magnets, the length of the kiln is only 5-8 meters, the maximum temperat...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/80C04B35/622C04B38/00F27D5/00
CPCC04B35/803F27D5/0012C04B35/185C04B35/622C04B38/00C04B2235/3206C04B2235/3222C04B2235/3217C04B2235/3463C04B2235/349C04B2235/5236C04B38/0074
Inventor 邵顺芳朱义文
Owner 无锡顺佳特种陶瓷有限公司
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