CN101844931A - Silicon carbide high temperature ceramic kiln furniture - Google Patents
Silicon carbide high temperature ceramic kiln furniture Download PDFInfo
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- CN101844931A CN101844931A CN 201010173746 CN201010173746A CN101844931A CN 101844931 A CN101844931 A CN 101844931A CN 201010173746 CN201010173746 CN 201010173746 CN 201010173746 A CN201010173746 A CN 201010173746A CN 101844931 A CN101844931 A CN 101844931A
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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 have a good chemical stability, and good wear resistance and excellent high-temperature behavior have become most important structural ceramic material and be widely adopted.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, the combination difference, the temperature 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, its thermal conductivity height especially, and 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 volumetric expansion can take place high temperature oxidation product cristobalite, 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.The silicon carbide ceramics that provides for patents such as CN101654359, CN1769241, CN1821179 as publication number does not all solve the problem of 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 the antioxidant property excellence, 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 described kiln furnitures comprise mold and anti oxidation layer, are provided with the middle layer that plays a transition role between described mold and the anti oxidation layer, its manufacture method is as follows:
The a base mixes silicon carbide, silica-alumina gel, methylcellulose gum and water to stir and makes slurry, dries after mold is made in slurry molding moulding;
B is dried behind the sprayed silicon alumina gel of described mold surface;
C is dried behind described mold surface spraying antioxidant coating;
The d sinter molding.
Described 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; described middle layer is the structure of the mullite phase of silica-alumina gel sintering formation; described middle layer bonding mold and anti oxidation layer; because the physicalies such as the coefficient of expansion between mold and the anti oxidation layer have big difference; anti oxidation layer ftractures easily in the circulation of heating refrigerative; peel off; thereby the provide protection that loses mold causes kiln furnitures oxidation-resistance variation; physicalies such as the coefficient of expansion of the mullite phase structure in described middle layer and described mold and described 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.
As preferably, described silica-alumina gel is that aluminium sesquioxide and silicon carbide powder add water and grind the gel of making.Described aluminium sesquioxide and silicon carbide powder finally are ground to nano level granular size, form spawn with suitable quantity of water.Form the mullite phase structure behind the described silica-alumina gel sintering, physicals such as its coefficient of expansion and described mold and described anti oxidation layer are approaching.
As preferably, described slurry is by weight:
4～7 parts in 12～24 order silicon carbide
1～3 part in 24～80 order silicon carbide
2～5 parts in 150～320 order silicon carbide
0.1～0.6 part of the above silicon carbide super-fine powder of granularity 320 orders
0.1～1 part of methylcellulose gum
0.1～1 part of silica-alumina gel
0.1～0.9 part in water
So-called order is the granularity measure unit of industrial powder particle size.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 silicon carbide is the main raw material of silicon carbide ceramics, methylcellulose gum makes more easy-formation of described slurry, its skeleton support effect in the slurry that powder mixes such as silicon carbide form, described 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, described coating is by weight:
0.5～1.5 part of aluminium sesquioxide
5～7 parts of south african andalusites
1～2 part of electrofused mullite
1～2 part of calcining mullite
0.05～0.2 part of wood glue
Be main antioxidant material after described aluminium sesquioxide and southern red pillar are powder sintered, the mullite phase structure that described electrofused mullite and described 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 described anti oxidation layer from occurring peeling off, ftractureing and sticking porcelain phenomenon, described wood glue is the organic polymer membrane-forming agent.
As preferably, described coating is by weight:
0.5～1.5 part of aluminium sesquioxide
5～7 parts of south african andalusites
1～2 part of electrofused mullite
1～2 part of calcining mullite
0.05～0.2 part of silica-alumina gel
Described silica-alumina gel is a membrane-forming agent.
As preferably, the described mold after spraying finished is through the high temperature sintering 4 day left and right sides moulding of 1500 degree to 1560 degree.
As preferably, described aluminium sesquioxide granularity is 300～340 orders, and described south african andalusite granularity is 300～340 orders, and described electrofused mullite granularity is 180～220 orders, and described 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, described kiln furnitures comprise mold and the anti oxidation layer that covers the mold surface, between described mold and the anti oxidation layer middle layer are arranged, and its manufacture method is as follows:
The a base, by weight 4.6 parts in 12～24 order silicon carbide, 1.4 parts in 24～80 order silicon carbide, 3.1 parts in 150～320 order silicon carbide, 0.6 part of the above silicon carbide super-fine powder of granularity 320 orders, 0.2 part of methylcellulose gum, aluminium sesquioxide and silicon carbide powder are added water grind make 0.1 part of silica-alumina gel, slurry is made in 0.8 part of stirring of water, will under 30 degree room temperatures, dry after the slurry molding moulding;
B is added by aluminium sesquioxide and silicon carbide powder in the surface spraying of described mold dries after silica-alumina gel is made 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 making by weight part in the spraying of described mold surface;
Described mold after d finishes spraying is through the high temperature sintering 4 day left and right sides moulding 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, described kiln furnitures comprise mold and the anti oxidation layer that covers the mold surface, between described mold and the anti oxidation layer middle layer are arranged, and its manufacture method is as follows:
The a base, by weight 1 part in 12～24 order silicon carbide, 1 part in 24～80 order silicon carbide, 2 parts in 150～320 order silicon carbide, 0.1 part of the above silicon carbide super-fine powder of granularity 320 orders, 0.1 part of methylcellulose gum, aluminium sesquioxide and silicon carbide powder are added water grind make 0.1 part of silica-alumina gel, slurry is made in 0.1 part of stirring of water, will under 30 degree room temperatures, dry after the slurry molding moulding;
B is added by aluminium sesquioxide and silicon carbide powder in the surface spraying of described mold dries after silica-alumina gel is made 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 making by weight part in the spraying of described mold surface;
Described mold after d finishes spraying is through the high temperature sintering 4 day left and right sides moulding 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, described kiln furnitures comprise mold and the anti oxidation layer that covers the mold surface, between described mold and the anti oxidation layer middle layer are arranged, and its manufacture method is as follows:
The a base, by weight 7 parts in 12～24 order silicon carbide, 3 parts in 24～80 order silicon carbide, 5 parts in 150～320 order silicon carbide, 0.6 part of the above silicon carbide super-fine powder of granularity 320 orders, 1 part of methylcellulose gum, aluminium sesquioxide and silicon carbide powder are added water grind make 1 part of silica-alumina gel, slurry is made in 0.9 part of stirring of water, will under 30 degree room temperatures, dry after the slurry molding moulding;
B is added by aluminium sesquioxide and silicon carbide powder in the surface spraying of described mold dries after silica-alumina gel is made 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 making by weight part in the spraying of described mold surface;
Described mold after d finishes spraying is through the high temperature sintering 4 day left and right sides moulding of 1500 degree to 1560 degree.
Claims (7)
1. a silicon carbide high temperature ceramic kiln furniture is characterized in that, described kiln furnitures comprise mold and anti oxidation layer, is provided with the middle layer that plays a transition role between described mold and the anti oxidation layer, and its manufacture method is as follows:
(a) base mixes silicon carbide, silica-alumina gel, methylcellulose gum and water to stir and makes slurry, dries after mold is made in slurry molding moulding;
(b) behind the sprayed silicon alumina gel of described mold surface, dry;
(c) behind described 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, described silica-alumina gel is that aluminium sesquioxide and silicon carbide powder add the gel that the water grinding is made.
3. a kind of silicon carbide high temperature ceramic kiln furniture according to claim 1 is characterized in that, described slurry is by weight:
4～7 parts in 12～24 order silicon carbide
1～3 part in 24～80 order silicon carbide
2～5 parts in 150～320 order silicon carbide
0.1～0.6 part of the above silicon carbide super-fine powder of granularity 320 orders
0.1～1 part of methylcellulose gum
0.1～1 part of silica-alumina gel
0.1～0.9 part in water
4. a kind of silicon carbide high-temperature ceramic according to claim 1 holds the firing tool, it is characterized in that, described antioxidant coating is by weight:
0.5～1.5 part of aluminium sesquioxide
5～7 parts of south african andalusites
1～2 part of electrofused mullite
1～2 part of calcining mullite
0.05～0.2 part of wood glue
5. a kind of silicon carbide high-temperature ceramic according to claim 1 holds the firing tool, it is characterized in that, described coating is by weight:
0.5～1.5 part of aluminium sesquioxide
5～7 parts of south african andalusites
1～2 part of electrofused mullite
1～2 part of calcining mullite
0.05～0.2 part of silica-alumina gel
6. a kind of silicon carbide high-temperature ceramic according to claim 1 holds the firing tool, it is characterized in that, the described mold after spraying is finished is through the high temperature sintering 4 day left and right sides moulding of 1500 degree to 1560 degree.
7. hold the firing tool according to claim 4 or 5 described a kind of silicon carbide high-temperature ceramics, it is characterized in that, described aluminium sesquioxide granularity is 300～340 orders, described south african andalusite granularity is 300～340 orders, described electrofused mullite granularity is 180～220 orders, and described 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 |
Publications (2)
| Publication Number | Publication Date |
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| CN101844931A true CN101844931A (en) | 2010-09-29 |
| CN101844931B 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102491762A (en) * | 2011-11-18 | 2012-06-13 | 常熟市创新陶瓷有限公司 | High-temperature fireproof kiln material and preparing method thereof |
| CN113354424A (en) * | 2021-06-15 | 2021-09-07 | 洛阳广潇新材料科技有限公司 | High-stripping-resistance oxygen lance brick and preparation 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 |
| CN114085081A (en) * | 2021-10-27 | 2022-02-25 | 南通三责精密陶瓷有限公司 | Silicon carbide kiln furniture and manufacturing 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 |
-
2010
- 2010-05-17 CN CN 201010173746 patent/CN101844931B/en not_active Expired - Fee Related
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 |
|---|
| 《carbon》 20031231 Huang JianFeng et al. Mullite-Al2O3-SiC oxidation protective coating for carbon/carbon composites 第2825-2829页 1-7 , 第41期 2 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102491762A (en) * | 2011-11-18 | 2012-06-13 | 常熟市创新陶瓷有限公司 | High-temperature fireproof kiln material and preparing method thereof |
| 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 |
| CN113354424A (en) * | 2021-06-15 | 2021-09-07 | 洛阳广潇新材料科技有限公司 | High-stripping-resistance oxygen lance brick and preparation 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 |
| CN114085081A (en) * | 2021-10-27 | 2022-02-25 | 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 |
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| Publication number | Publication date |
|---|---|
| CN101844931B (en) | 2012-12-12 |
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