CN101844931B - Silicon carbide high temperature ceramic kiln furniture - Google Patents
Silicon carbide high temperature ceramic kiln furniture Download PDFInfo
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- CN101844931B CN101844931B CN 201010173746 CN201010173746A CN101844931B CN 101844931 B CN101844931 B CN 101844931B CN 201010173746 CN201010173746 CN 201010173746 CN 201010173746 A CN201010173746 A CN 201010173746A CN 101844931 B CN101844931 B CN 101844931B
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Abstract
The invention relates to a fireproof material, in particular to silicon carbide high temperature ceramic kiln furniture for a high temperature sintering kiln. The kiln furniture comprises a blank and an anti-oxidation layer, wherein an intermediate layer which plays a role in transition is arranged between the blank and the anti-oxidation layer. A method for manufacturing the kiln furniture comprises the following steps of: a, manufacturing the blank, namely mixing and stirring silicon carbide, silicon-aluminum gel, methylcellulose and water to obtain slurry, molding the slurry to obtain the blank and drying the blank; b, spraying the silicon-aluminum gel on the surface of the blank and drying the blank; c, spraying an anti-oxidation coating on the surface of the blank and drying the blank; and d, sintering the blank for molding. The method solves the problems that the silicon carbide ceramic kiln furniture has poor high-temperature oxidation resistance and thermal shock resistance and prolongs the service life of the silicon carbide ceramic kiln furniture in the frequent heating and cooling process at the same time; the process is simple and the production is convenient; and the service life of the kiln furniture is about 60 periods longer than that of similar products and is improved by over 50 percent.
Description
Technical field
The present invention relates to a kind of refractory materials, a kind of specifically silicon carbide high temperature ceramic kiln furniture that is used for the high temperature sintering kiln.
Background technology
Kiln furnitures are a kind of high grade refractories, and its quality quality has direct influence for the quality of burnt product, production cost.The material of kiln furnitures should possess higher refractoriness, good thermostability, higher normal temperature and hot strength, the load that plays goods and kiln furnitures itself that must stand, good thermal conductivity, low heat storing and antioxidant property.Silicon carbide ceramics is owing to having good chemicalstability, and good wear resistance and excellent high-temperature behavior have become most important structural ceramic material and extensively employing of quilt.Since the eighties in last century, carry out ceramic Fast Sintering technology both at home and abroad, silicon carbide ceramics becomes the preferred material of Fast Sintering kiln with Hightemperature Kiln Furniture.The siliceous kiln furnitures of carbonization are divided into the direct combination of clay combination, silica bound, mullite bonded and recrystallization etc. by inner combination; Combination is different, and the temperature property of its high-temperature behavior such as high volume, intensity, lotus are soft, oxidation-resistance and heat-shock resistance have nothing in common with each other.Compare with other kiln furniture products such as fused quartz matter, the thermal expansivity of the siliceous kiln furnitures of carbonization is little, and especially its thermal conductivity is high, good thermal shock stability, and at high temperature do not produce deformation.But compare with other oxide high-temperature kiln furnitures, the high temperature oxidation stability problem of the siliceous kiln furnitures of carbonization is outstanding, and high temperature oxidation product cristobalite can volume expanding, makes the kiln furnitures short texture, so that cracks and directly influence the work-ing life and the quality of kiln furnitures.The oxidation-resistance and the heat-shock resistance that how to improve the siliceous kiln furnitures of carbonization have become the domestic and international research problem.Like publication number is the problem that silicon carbide ceramics that patents such as CN101654359, CN1769241, CN1821179 provide does not all solve silicon carbide ceramics high temperature oxidation stability and heat-shock resistance fully; How to solve silicon carbide ceramics high temperature oxidation stability and heat-shock resistance problem; To promote the work-ing life of kiln furnitures, reach the security that promotes in producing, promote quality product; The effect that reduces production costs, contriver's problem that will solve just.
Summary of the invention
The invention solves silicon carbide ceramics high temperature oxidation stability problem and heat-shock resistance problem, provide a kind of under hot conditions antioxidant property excellent, good thermal shock, the high temperature ceramic kiln furniture of long service life.
Its concrete technical scheme is: a kind of silicon carbide high temperature ceramic kiln furniture, and said kiln furnitures comprise mold and anti oxidation layer, are provided with the middle layer that plays a transition role between said mold and the anti oxidation layer, its method of manufacture is following:
(a) base mixes silit, silica-alumina gel, methylcellulose gum and water to stir and processes slurry, dries after mold is processed in slurry molding moulding, and said silica-alumina gel is that aluminium sesquioxide adds the gel that the water grinding is processed with silicon carbide powder;
(b) behind the sprayed silicon alumina gel of said mold surface, dry;
(c) behind said mold surface spraying antioxidant coating, dry;
(d) sinter molding.
Said silicon carbide high temperature ceramic kiln furniture is mold with the silicon carbide ceramics; The anti oxidation layer that surface coverage has the coating sintering to form; Said middle layer is the structure of the mullite phase of silica-alumina gel sintering formation, and said middle layer bonding mold and anti oxidation layer are because the physicalies such as the coefficient of expansion between mold and the anti oxidation layer have big difference; In heating refrigerative circulation the anti oxidation layer easy of crack, peel off; Physicalies such as thereby the provide protection that loses mold causes kiln furnitures oxidation-resistance variation, the coefficient of expansion of the mullite phase structure in said middle layer and said mold and said zone of oxidation are all approaching, as buffering between the two; And the sticking power of zone of oxidation on mold is bad also to be peeled off easily, and sticking power is stronger on the middle layer.Said silica-alumina gel is that aluminium sesquioxide and silicon carbide powder add the gel that the water grinding is processed.Said aluminium sesquioxide and silicon carbide powder finally are ground to nano level particle size, form spawn with suitable quantity of water.Form the mullite phase structure behind the said silica-alumina gel sintering, physicals such as its coefficient of expansion and said mold and said anti oxidation layer are approaching.
As preferably, said slurry is by weight:
So-called order is the granularity measure unit that the powder particle size is gone up in industry.With above prescription mixing and stirring, moulded section as required then, the temperature oven drying at low temperature about 30 degree destroys the internal structure of mold thereby too high temperature can evaporate the water.Varigrained silit is the main raw material of silicon carbide ceramics; Methylcellulose gum makes more easy-formation of said slurry; Its skeleton support effect in the slurry that powder such as silit form; Said silica-alumina gel original position behind sintering forms the mullite phase structure, makes the mold coefficient of expansion etc. more near the middle layer.
As preferably, said coating is by weight:
Be main antioxidant material after said aluminium sesquioxide and southern red pillar are powder sintered; The mullite phase structure that said electrofused mullite and said calcining mullite make the physicalies such as the coefficient of expansion of anti oxidation layer form near middle layer silica-alumina gel sintering behind sintering; Prevent that said anti oxidation layer from occurring peeling off, ftractureing and sticking porcelain phenomenon, said wood glue is the organic polymer membrane-forming agent.
As preferably, said coating is by weight:
Said silica-alumina gel is a membrane-forming agent.
As preferably, with the high temperature sintering 4 day moulding of the said mold after the spraying completion through 1500 degree to 1560 degree.
As preferably, said aluminium sesquioxide granularity is 300～340 orders, and said south african andalusite granularity is 300～340 orders, and said electrofused mullite granularity is 180～220 orders, and said calcining mullite granularity is 300～340 orders.
The invention solves that silicon carbide ceramics kiln high temperature oxidation-resistance is poor, the problem of heat-shock resistance difference, promoted the work-ing life of silicon carbide ceramics kiln furnitures in frequent heating temperature-fall period simultaneously, and the technology simple production is convenient.The present invention 1400 the degree about high temperature in use, with per 48 hours be a loop cycle, its life-span, about long 60 cycles, improved more than 50% its work-ing life than like product.
Embodiment
Embodiment 1
The following embodiment of the invention 1 describes in further detail:
A kind of silicon carbide high temperature ceramic kiln furniture, said kiln furnitures comprise mold and the anti oxidation layer that covers the mold surface, between said mold and the anti oxidation layer middle layer are arranged, and its method of manufacture is following:
The a base; By weight with 4.6 parts in 12～24 order silit, 1.4 parts in 24～80 order silit, 3.1 parts in 150～320 order silit, 0.6 part of the above silit super-fine powder of granularity 320 orders, 0.2 part of methylcellulose gum, aluminium sesquioxide and silicon carbide powder add water grind process 0.1 part of silica-alumina gel, slurry is processed in 0.8 part of stirring of water, with under 30 degree room temperatures, drying after the slurry molding moulding;
B is added by aluminium sesquioxide and silicon carbide powder in the surface spraying of said mold dries after silica-alumina gel is processed in the water grinding;
C is to dry after 0.1 part of 1 part of 320 order aluminium sesquioxide, 6 parts of 320 order south african andalusites, 1.5 parts of 200 order electrofused mullites, 1.4 parts of mullites of 320 orders calcining, wood glue mix the coating of processing by weight part in the spraying of said mold surface;
Said mold after d will spray and accomplish is through the high temperature sintering left and right sides moulding in 4 days of 1500 degree to 1560 degree.
Embodiment 2
The following embodiment of the invention 2 describes in further detail:
A kind of silicon carbide high temperature ceramic kiln furniture, said kiln furnitures comprise mold and the anti oxidation layer that covers the mold surface, between said mold and the anti oxidation layer middle layer are arranged, and its method of manufacture is following:
The a base; By weight with 1 part in 12～24 order silit, 1 part in 24～80 order silit, 2 parts in 150～320 order silit, 0.1 part of the above silit super-fine powder of granularity 320 orders, 0.1 part of methylcellulose gum, aluminium sesquioxide and silicon carbide powder add water grind process 0.1 part of silica-alumina gel, slurry is processed in 0.1 part of stirring of water, with under 30 degree room temperatures, drying after the slurry molding moulding;
B is added by aluminium sesquioxide and silicon carbide powder in the surface spraying of said mold dries after silica-alumina gel is processed in the water grinding;
C is to dry after 0.05 part of 0.5 part of 320 order aluminium sesquioxide, 5 parts of 320 order south african andalusites, 1 part of 200 order electrofused mullite, 1 part of mullite of 320 orders calcining, wood glue mix the coating of processing by weight part in the spraying of said mold surface;
Said mold after d will spray and accomplish is through the high temperature sintering left and right sides moulding in 4 days of 1500 degree to 1560 degree.
Embodiment 3
The following embodiment of the invention 3 describes in further detail:
A kind of silicon carbide high temperature ceramic kiln furniture, said kiln furnitures comprise mold and the anti oxidation layer that covers the mold surface, between said mold and the anti oxidation layer middle layer are arranged, and its method of manufacture is following:
The a base; By weight with 7 parts in 12～24 order silit, 3 parts in 24～80 order silit, 5 parts in 150～320 order silit, 0.6 part of the above silit super-fine powder of granularity 320 orders, 1 part of methylcellulose gum, aluminium sesquioxide and silicon carbide powder add water grind process 1 part of silica-alumina gel, slurry is processed in 0.9 part of stirring of water, with under 30 degree room temperatures, drying after the slurry molding moulding;
B is added by aluminium sesquioxide and silicon carbide powder in the surface spraying of said mold dries after silica-alumina gel is processed in the water grinding;
C is to dry after 0.2 part of 1.5 parts of 320 order aluminium sesquioxide, 7 parts of 320 order south african andalusites, 2 parts of 200 order electrofused mullites, 2 parts of silica-alumina gels of 320 orders calcining mullite mix the coating of processing by weight part in the spraying of said mold surface;
Said mold after d will spray and accomplish is through the high temperature sintering left and right sides moulding in 4 days of 1500 degree to 1560 degree.
Claims (6)
1. a silicon carbide high temperature ceramic kiln furniture is characterized in that, said kiln furnitures comprise mold and anti oxidation layer, is provided with the middle layer that plays a transition role between said mold and the anti oxidation layer, and its method of manufacture is following:
(a) base mixes silit, silica-alumina gel, methylcellulose gum and water to stir and processes slurry, dries after mold is processed in slurry molding moulding, and said silica-alumina gel is that aluminium sesquioxide adds the gel that the water grinding is processed with silicon carbide powder;
(b) behind the sprayed silicon alumina gel of said mold surface, dry;
(c) behind said mold surface spraying antioxidant coating, dry;
(d) sinter molding.
2. a kind of silicon carbide high temperature ceramic kiln furniture according to claim 1 is characterized in that, said slurry is by weight:
3. a kind of silicon carbide high temperature ceramic kiln furniture according to claim 1 is characterized in that, said antioxidant coating is by weight:
4. a kind of silicon carbide high temperature ceramic kiln furniture according to claim 1 is characterized in that, said coating is by weight:
5. a kind of silicon carbide high temperature ceramic kiln furniture according to claim 1 is characterized in that, the said mold after spraying is accomplished is through the high temperature sintering moulding in 4 days of 1500 degree to 1560 degree.
6. according to claim 3 or 4 described a kind of silicon carbide high temperature ceramic kiln furnitures; It is characterized in that; Said aluminium sesquioxide granularity is 300～340 orders; Said south african andalusite granularity is 300～340 orders, and said electrofused mullite granularity is 180～220 orders, and said calcining mullite granularity is 300～340 orders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010173746 CN101844931B (en) | 2010-05-17 | 2010-05-17 | Silicon carbide high temperature ceramic kiln furniture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010173746 CN101844931B (en) | 2010-05-17 | 2010-05-17 | Silicon carbide high temperature ceramic kiln furniture |
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| Publication Number | Publication Date |
|---|---|
| CN101844931A CN101844931A (en) | 2010-09-29 |
| CN101844931B true CN101844931B (en) | 2012-12-12 |
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| CN 201010173746 Expired - Fee Related CN101844931B (en) | 2010-05-17 | 2010-05-17 | Silicon carbide high temperature ceramic kiln furniture |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102491762B (en) * | 2011-11-18 | 2013-08-14 | 常熟市创新陶瓷有限公司 | High-temperature fireproof kiln material and preparing method thereof |
| CN113354424B (en) * | 2021-06-15 | 2023-05-26 | 洛阳广潇新材料科技有限公司 | High-spalling-resistance oxygen lance brick and preparation method thereof |
| CN114085081B (en) * | 2021-10-27 | 2022-10-21 | 南通三责精密陶瓷有限公司 | Silicon carbide kiln furniture and manufacturing method thereof |
| CN113800932A (en) * | 2021-11-10 | 2021-12-17 | 济源市耐火炉业有限公司 | Composite checker brick for large coke oven and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1769241A (en) * | 2005-08-26 | 2006-05-10 | 中国科学院上海硅酸盐研究所 | In-situ reaction prepares the carborundum porous ceramics of mullite bonded |
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2010
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1769241A (en) * | 2005-08-26 | 2006-05-10 | 中国科学院上海硅酸盐研究所 | In-situ reaction prepares the carborundum porous ceramics of mullite bonded |
Non-Patent Citations (1)
| Title |
|---|
| Huang JianFeng et al..Mullite-Al2O3-SiC oxidation protective coating for carbon/carbon composites.《carbon》.2003,(第41期),第2825-2829页. * |
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| CN101844931A (en) | 2010-09-29 |
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