CN101798236A - Ceramic inner cylinder for preheater of dry method cement rotary kiln - Google Patents
Ceramic inner cylinder for preheater of dry method cement rotary kiln Download PDFInfo
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- CN101798236A CN101798236A CN 201010158705 CN201010158705A CN101798236A CN 101798236 A CN101798236 A CN 101798236A CN 201010158705 CN201010158705 CN 201010158705 CN 201010158705 A CN201010158705 A CN 201010158705A CN 101798236 A CN101798236 A CN 101798236A
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- inner cylinder
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- preheater
- rotary kiln
- dry method
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Abstract
The invention relates to a ceramic inner cylinder of a preheater of a dry method cement rotary kiln, which belongs to the technical field of silicate. The ceramic inner cylinder is prepared from the following components in percentage by weight: 75-80 percent of alpha-Si3N4, 5-8 percent of Al2O3, 3-5 percent of SiO2, 2-3 percent of ZrO2, 1-3 percent of Y2O3 and 5-10 percent of returning blank, wherein the alpha-phase content in the alpha-Si3N4 is more than 90 percent, the fineness of the alpha-Si3N4 is controlled to be below 3mu m for 20 percent, 3-20mu m for 40 percent and 20-40mu m for 40 percent, the fineness of the Al2O3 is below 3mu m, the fineness of the ZrO2 is below 1mu m and the fineness of the Y2O3 is below 2mu m. A coating layer is arranged on the surface of the inner cylinder and is a boron nitride coating layer. The invention has long service life.
Description
Technical field
The present invention relates to a kind of ceramic inner cylinder for preheater of dry method cement rotary kiln, belong to field of silicate technology.
Background technology
Inner core (or claiming lacing film) is housed in the preheater before the cement rotary kiln and since operating environment abominable (high temperature oxidation corrosion wearing and tearing), inner core is all assembled by the high temperature steel link plate usually, anchor can be established in the upper strata, bottom can be established web plate and reinforce.Link plate is a cambered plate, and the link plate upper end is provided with hanging hole, and the link plate lower end is provided with corresponding hook, and following link plate hanging hole is suspended on the top link plate hook, connect complex structure, loose undertighten successively, even like this, work-ing life is still shorter, and the Pyatyi inner core also only has only 6-12 months.
Summary of the invention
The object of the present invention is to provide a kind of ceramic inner cylinder for preheater of dry method cement rotary kiln, long service life.
Ceramic inner cylinder for preheater of dry method cement rotary kiln of the present invention, its ingredients by weight percentage composition is:
α-Si
3N
4Powder 75-80%, AL
2O
35-8%, SiO
23-5%, ZrO
22-3%, Y
2O
31-3% and time blank 5-10%.
Boron nitride fibre has improved the toughness of material.
Wherein, α-Si
3N
4In α phase content＞90%.
The batching fineness is controlled to be α-Si
3N
4Powder 3 μ m are following 20%, 3--20 μ m40%, 20--40 μ m40%, AL
2O
33 μ m are following, ZrO
2Following and the Y of 1 μ m
2O
3Below the 2 μ m, SiO
2Be commercially available micro mist.
There is coatings on the inner core surface, and coatings is selected the coating boron nitride film layer, fire after can applying with 1 μ m boron nitride micro mist paste to form, and surface anticorrosion, anti-oxidant, the resistance of oxidation of raising material.
Adopt injection molding, extrude or etc. forming techniques such as static pressure, base substrate internal structure uniformity, product performance are stable.Preferably add the moulding additive during moulding, improve processability.
Preparation flow is as follows: checks such as batching, homogenizing, slurrying/refining mud/dry-pressing powder, moulding, surface coating, drying, work in-process processing, non-destructive test(ing)(NDT), nitrogen protection induction heating/vacuum reaction sintering, post-treatment and surface treatment, non-destructive test(ing)(NDT).
Ceramic inner barrel of preheater for cement kiln of the present invention, long service life reached more than 2 years.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
Ceramic inner cylinder for preheater of dry method cement rotary kiln of the present invention, its ingredients by weight percentage composition is:
α-Si
3N
4Powder 80%, AL
2O
35%, SiO
2:5%, ZrO
23%, Y
2O
31%, boron nitride fibre 1%, time blank 5%.
Wherein: α-Si
3N
4In the α phase content be 93%.
The batching fineness is controlled to be: α-Si
3N
4Powder 3 μ m are following 20%, 3--20 μ m40%, 20--40 μ m40%, AL
2O
33 μ m are following, ZrO
2Following and the Y of 1 μ m
2O
3Below the 2 μ m, SiO
2Be commercially available micro mist.
To prepare burden with water to after the medium ball milling mixes; adding 1.0% polyvinyl alcohol again mixes and obtained slurry in 2 hours; the oven dry granulation; get the following above granulation material of 140 orders of 40 orders; isostatic pressing gets base substrate under 120Mpa pressure; the surface coating coating applies with 1 μ m boron nitride micro mist paste, and burn till under 1700 ℃ of temperature, nitrogen atmosphere protection the oven dry back, is incubated 6 hours.
Embodiment 2
Ceramic inner cylinder for preheater of dry method cement rotary kiln of the present invention, its ingredients by weight percentage composition is:
α-Si
3N
4Powder 75%, AL
2O
38%, SiO
2:5%, ZrO
23%, Y
2O
31%, boron nitride fibre 1%, time blank 7%.
Wherein: α-Si
3N
4In the α phase content be 91%.
The batching fineness is controlled to be α-Si
3N
43 μ m are following 20%, 3--20 μ m40%, 20--40 μ m40%, AL
2O
33 μ m are following, ZrO
2Following and the Y of 1 μ m
2O
3Below the 2 μ m, SiO
2Be commercially available micro mist.
Outer add-on type additive: 2130 resins: 15%; Glycerine: 1%; Paraffin 3%; Methylcellulose gum 2%;
Evenly mediate 100 minutes (requiring 90-120 minute).
Extrusion moulding:
Vacuum refining mud, vacuum tightness 0.2MPa(requires greater than 0.1MPa), refine the old homogenizing of preserving moisture 25 hours, extrusion moulding three times.
The desiccated surface coating
Product is sent into 40 ℃ earlier, and humidity 70%(requires 60-80%) dried 48 hours; To 60 ℃, through the surface coating coating, 200 ℃ of 48 hours resin solidifications.
Burn till:
Product is shove charge behind nondestructiving inspecting test, and room temperature reached under 1700 ℃ of temperature, the nitrogen atmosphere protection through 8 hours burns till, and is incubated 4 hours, is cooled to 50 ℃ and comes out of the stove in 6 hours.Product carries out packing after the assay was approved such as non-destructive test(ing)(NDT) after surface treatment such as sandblast.
Embodiment 3
Ceramic inner cylinder for preheater of dry method cement rotary kiln of the present invention, its ingredients by weight percentage composition is:
α-Si
3N
4Powder 76%, AL
2O
38%, SiO
2:3%, ZrO
22.5%, Y
2O
32% and return blank 8.5%.
Wherein: α-Si
3N
4In α phase content 93%.
The batching fineness is controlled to be α-Si
3N
4Powder 3 μ m are following 20%, 3--20 μ m40%, 20--40 μ m40%, AL
2O
33 μ m are following, ZrO
2Following and the Y of 1 μ m
2O
3Below the 2 μ m, SiO
2Be commercially available micro mist.
Extrusion moulding, product are sent into 40 ℃ earlier, humidity 75% oven dry 48 hours; To 60 ℃, surface coating applies with 1 μ m boron nitride micro mist paste, 205 ℃ of 48 hours resin solidifications.
Burn till:
Product is shove charge behind nondestructiving inspecting test, and room temperature reached under 1680 ℃ of temperature, the nitrogen atmosphere protection through 8.5 hours burns till, and is incubated 4 hours, is cooled to 50 ℃ and comes out of the stove in 6 hours.Product carries out packing after the assay was approved such as non-destructive test(ing)(NDT) after surface treatment such as sandblast.
Embodiment 4
Ceramic inner cylinder for preheater of dry method cement rotary kiln of the present invention, its ingredients by weight percentage composition is:
α-Si
3N
4Powder 77%, AL
2O
36%, SiO
2:4%, ZrO
23%, Y
2O
32.5% and return blank 7.5%.
Wherein: α-Si
3N
4In α phase content 91.5%.
The batching fineness is controlled to be α-Si
3N
4Powder 3 μ m are following 20%, 3--20 μ m40%, 20--40 μ m40%, AL
2O
33 μ m are following, ZrO
2Following and the Y of 1 μ m
2O
3Below the 2 μ m, SiO
2Be commercially available micro mist.
Extrusion moulding, product are sent into 40 ℃ earlier, humidity 78% oven dry 48 hours; To 60 ℃, surface coating applies with 1 μ m boron nitride micro mist paste, 200 ℃ of 48 hours resin solidifications.
Burn till:
Product is shove charge behind nondestructiving inspecting test, and room temperature reached under 1700 ℃ of temperature, the nitrogen atmosphere protection through 8 hours burns till, and is incubated 4 hours, is cooled to 50 ℃ and comes out of the stove in 6 hours.Product carries out packing after the assay was approved such as non-destructive test(ing)(NDT) after surface treatment such as sandblast.
Product performance index is as follows:
Density:＞3.0g/cm
3
Normal temperature bending strength:＞850MPa
1000 ℃ of bending strength:＞800MPa
Hardness: Hv＞1950kg/mm
3
Fracture toughness property:＞5.5MPa.m
1/2
The hardness height, fracture toughness property is good, the high temperature use properties is good.
Claims (5)
1. ceramic inner cylinder for preheater of dry method cement rotary kiln is characterized in that its ingredients by weight percentage composition is:
α-Si
3N
4Powder 75-80%, AL
2O
35-8%, SiO
2:3-5%, ZrO
22-3%, Y
2O
31-3% and time blank 5-10%.
2. ceramic inner cylinder for preheater of dry method cement rotary kiln according to claim 1 is characterized in that α-Si
3N
4In α phase content＞90%.
3. ceramic inner cylinder for preheater of dry method cement rotary kiln according to claim 1 and 2, the fineness that it is characterized in that preparing burden is controlled to be α-Si
3N
4Powder 3 μ m are following 20%, 3--20 μ m40%, 20--40 μ m40%, AL
2O
33 μ m are following, ZrO
2Following and the Y of 1 μ m
2O
3Below the 2 μ m.
4. ceramic inner cylinder for preheater of dry method cement rotary kiln according to claim 3 is characterized in that there is coatings on the inner core surface.
5. ceramic inner cylinder for preheater of dry method cement rotary kiln according to claim 4 is characterized in that coatings is the coating boron nitride film layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101587058A CN101798236B (en) | 2009-04-30 | 2010-04-29 | Ceramic inner cylinder for preheater of dry method cement rotary kiln |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910015019.2 | 2009-04-30 | ||
| CN200910015019A CN101704675A (en) | 2009-04-30 | 2009-04-30 | Method for preparing internal barrel of ceramic pre-heater |
| CN2010101587058A CN101798236B (en) | 2009-04-30 | 2010-04-29 | Ceramic inner cylinder for preheater of dry method cement rotary kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101798236A true CN101798236A (en) | 2010-08-11 |
| CN101798236B CN101798236B (en) | 2011-12-07 |
Family
ID=42594100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101587058A Active CN101798236B (en) | 2009-04-30 | 2010-04-29 | Ceramic inner cylinder for preheater of dry method cement rotary kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101798236B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107903044A (en) * | 2017-10-19 | 2018-04-13 | 淄博市鲁中耐火材料有限公司 | Low heat conduction high resistance to corrosion corundum fireproof brick and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02296764A (en) * | 1989-05-12 | 1990-12-07 | Nkk Corp | Production of porcelain |
| US5214011A (en) * | 1991-08-30 | 1993-05-25 | Bfd, Incorporated | Process for preparing ceramic-metal composite bodies |
| WO2007039310A1 (en) * | 2005-10-06 | 2007-04-12 | Vesuvius Crucible Company | Crucible for the crystallization of silicon and process for making the same |
-
2010
- 2010-04-29 CN CN2010101587058A patent/CN101798236B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02296764A (en) * | 1989-05-12 | 1990-12-07 | Nkk Corp | Production of porcelain |
| US5214011A (en) * | 1991-08-30 | 1993-05-25 | Bfd, Incorporated | Process for preparing ceramic-metal composite bodies |
| WO2007039310A1 (en) * | 2005-10-06 | 2007-04-12 | Vesuvius Crucible Company | Crucible for the crystallization of silicon and process for making the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107903044A (en) * | 2017-10-19 | 2018-04-13 | 淄博市鲁中耐火材料有限公司 | Low heat conduction high resistance to corrosion corundum fireproof brick and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101798236B (en) | 2011-12-07 |
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