CN1056892A - The foamy graphite ceramoplastics of type material - Google Patents
The foamy graphite ceramoplastics of type material Download PDFInfo
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- CN1056892A CN1056892A CN 90105112 CN90105112A CN1056892A CN 1056892 A CN1056892 A CN 1056892A CN 90105112 CN90105112 CN 90105112 CN 90105112 A CN90105112 A CN 90105112A CN 1056892 A CN1056892 A CN 1056892A
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Abstract
The foamy graphite ceramoplastics of type material is a kind of vacuum oven and uses thereof high temperature high frequency thermal insulation material, and its volume density reaches 0.51-0.21g/cm
3, compressive strength 5-11MPa.When heating 1000 ℃, thermal conductivity is about 0.9-0.11KCal/Mh ℃.Be by pitch; Clay is purified metals and element silicon, in addition carbide and combustiblematerials synthetic catalytic agent.Through die mould, heating is burnt till more than 2000 ℃.Be used for vacuum, the thermal insulation of nuclear power high temperature high frequency; Chemical filtration, support of the catalyst; Aerospacecraft, nozzle, transpiring material matrix and electronic industry provide material.
Description
A kind of novel-foamy graphite ceramoplastics that is used for vacuum oven, High Temperature Furnaces Heating Apparatus as the thermal insulation material of furnace lining and beer, drink liquid filter media material.
Vacuum oven of China and High Temperature Furnaces Heating Apparatus, the furnace lining thermal insulation material is very backward, and the cost of material is also very expensive, exists many disadvantages.Domestic stove thermal insulation material requires more and more high, causes continuous replacement.Existing vacuum oven is the charcoal felt as the material of furnace lining, and this material bodies is soft, and manipulation strength is big.Flooded but point hard and be out of shape, ventilation property is bad, simultaneously the high temperature resistant shortcomings such as scope that are limited to 800-1300 ℃.External thermal insulation material, as the porous charcoal of the Soviet Union, volume density is 1.1-0.9g/cm
3, void content 48-57%, there is micro-dust on the matrix top layer.These materials have certain shortcoming as vacuum oven furnace lining thermal insulation material, influence the quality of vacuum oven to the thermal treatment product.Therefore, the thermal insulation material that vacuum oven is used proposes new requirement (problem):
1, must light weight volume density ≯ 0.4g/cm as this material
3, void content 50-80%.
2, require material thickness ≯ 20mm, wide＞350mm, long 900-1200mm.Ultimate compression strength 3.5-10MPa, the matrix top layer does not have particulate dirt, high temperature resistant 1300-1450 ℃.
The objective of the invention is the problem that exists according to this thermal insulation material as the vacuum oven furnace lining of requesting for conciliation certainly, and porous (foam) charcoal-graphite cermet material of development, abbreviate the foamy graphite ceramoplastics of type material as, it replaces the charcoal felt, and is as stove furnace lining thermal insulation materials such as vacuum oven, High Temperature Furnaces Heating Apparatuss, high temperature resistant, anti-advantage such as wash away, as be used for beer filtration, and can solve with the filtering problem of cotton layer, economical, can reduce labor intensity.Await developing the needs that are used for universe, chemical industry, machinofacture, electronics, silicon single crystal, vacuum technique very important material is provided.Invigorate the economy, go to the world, opened window.
Manufacture method and content: 3, the major metal of dosing in the foamy graphite stupalith of the present invention is Fe
2O
3And Al
2O
3And nonmetal SiO
2Deng element, by purifying in potter's clay and the clay, insufficient section adds in addition, plays oxidation resistant effect.Plasticity-, expansion, contraction, salic high feature with potter's clay, clay, advantages such as high temperature heat-resistant good stability, so, go in potter's clay and the clay adding graphite, what want to obtain is to have anti-oxidant, the anti-heat of ablation to stablize, and can expand and shrinkable characteristic graphite ceramic material.Directly not adding graphite or coke powder in this technical recipe, is the main feature of this technology.Use but promptly be used as filler again when binding agent with modifying asphalt.Produce charcoal-graphite by the advantage that the carboloy residue of modifying asphalt is high.Produce light porous (foam) material, earlier with potter's clay, go in the clay adding graphite, what make is except that element, is exactly the viscosity that it has, and improves the plasticity-of paste producing and the intensity of goods.Dosing after charing and greying of modifying asphalt transfers graphite crystal to by charcoal, promptly is graphite.Purpose is that to obtain the cell size of charcoal-graphite own big, easily and other material bonded advantage.
The light porous method of this material: the porous agent is the goods (material) of media, in the high pressure-temperature condition containing various elements and heterogeneous material plays a role, rearrange into new texture, the irregular bubble of the suspension space that passage trajectory range that the gas evolution that fusion forms is residual or close-burning form, they form different structure spaces, are considered as between porous air.The heterogeneous raw material of dosing in the batching, their combination is with modified phenolic resins, the viscous medium gummed effect of modifying asphalt, potter's clay, clay.The most important thing is factor that heterogeneous material is integrally combined, its making of compactness porous material arranged, this is that heterogeneous material prepares powder particle fully, the paste producing compressing tablet, and abrasive dust is made press-powder, the coldmoulding green compact.Be high pressure-temperature charing and graphited achievement at last.Their blendings heterogeneous material (comprising multiple element) and the material that adds chemistry, physical change of respectively playing together, be to pass through this process in the effect of being brought into play more than graphitization temperature 800-2000 ℃, we will be exactly light porous novel material-foamy graphite ceramoplastics with obtaining.
Technical recipe of the present invention: as shown in table 1.
Technical recipe: (all by % weight) table 1
| Raw material | Filler | The knot stick | Softening agent | Pore-forming material | Play (sending out) infusion | Catalyzer | |
| Title | Modifying asphalt | Potter's clay or clay | Modified phenolic resins | Paraffin | Rice husk and porous catalytic agent | Carbonate | Fe 2O 3 |
| The granularity order | (cold grinding) 6-100 | 6－320 | 80－320 | 80-320 (section) | 100－320 | 100－320 | 80－320 |
| Content % | ≤10 | ＜5 | ≤15 | ＜0.5 | ＜56.5 | ≤12 | ＜1 |
The principal character of new moulding mixture of the present invention sees Table 2
Type material-foamy graphite ceramoplastics principal character table 2
| Project | Volume density g/cm 3 | Void content % | Compressive strength mpa | Thermal conductivity kcal/mhc | Thermal expansivity 10 6l/℃ | Than resistance Ω mm 2/m | Specific heat kcal/kgc |
| Index | 0.51-0.20 | 58-95 | 5-11 | (1000℃) 0.9-0.11 | (1000℃) 2.5-3 | 3000- 4600 | (1000℃) 0.33 |
This material has been compared following advantage with the carbon felt:
1, the high temperature resistant 2000-2500 of this material ℃.When heating 1000 ℃, can shrink.Heating has anti-the ablation more than 2000 ℃ the time, indeformablely do not chap, and anti-washing away, the top layer does not have phenomenons such as particulate dirt comes off.
The performance that 2, metal cutting is arranged is made simply, and is cheap, only is 1/3 of carbon felt price.
Fig. 1: the foamy graphite ceramoplastics process flow sheet of type material.
Below in conjunction with accompanying drawing in detail concrete technical process of the present invention is described in detail:
The preparation process flow process of the foamy graphite ceramoplastics of the adiabatic novel material of the high temperature high frequency of a kind of vacuum oven and uses thereof is to utilize modifying asphalt (or oil, pitch coke) as main stuffing.Modified phenolic resins (softening temperature 100-110 ℃) is a binding agent.Synthesize the pore-creating catalytic agent with purify metals in clay etc. ferric oxide, aluminum oxide and nonmetal element silicon and carbide, combustiblematerials, drying is mixed and made into powder.Clay also can be directly as the subsidy filler.These heterogeneous raw materials are through abrasive dust, screening, mixing paste producing, compressing tablet (extrusion molding green compact), abrasive dust, preheating, moulding (hot and cold) green compact, charing and greying (identical with electrode production process).And this porous type material is that chemistry, physical change make in the atmosphere of graphitizable high temperature more than 2000 ℃.
Wherein: 1, mix kneading and stick with paste technological operation: filler, subsidy filler and pore-creating catalytic agent are added in the pot (being generally 500 liter kneaders), do and mixed 15-20 minute, do to mix and add catalyzer when temperature is about 35-55 ℃, do mixed temperature again and reach 85-105 ℃, vapor pressure is at 0.2-0.45Mpa, adding additives, the plasticity-of seeing paste after 15 minutes, as bad, add softening agent.Mix and pinched 45-55 minute, the temperature of paste is in the time of 170-185 ℃, and vapor pressure is more than 0.64-0.76Mpa, and compressing tablet or die mould take the dish out of the pot.
2, tablet forming technique: to roll temperature 120-145 ℃, the roller spacing transfers to 1-1.2mm, repeats to press more than twice, removes abrasive dust then, makes press-powder.Press-powder is used 70-85 ℃ of far infrared rays preheating before moulding, promptly plastic.
3, moulding process operation: moulding is the technology of a more complicated, be according to product requirements, and factors such as the condition of paste producing.Forming method, the nominal pressure of selection press.
(1) compression molding mode (cold, warm, heat) forming method, compacting thickness 100-400mm, longitudinal cross-section＜40-70Mpa.
(2) extrusion molding mode (middle temperature, heat) forming method, extruding diameter 100-500mm, lateral cross section＜20-31Mpa.
This invention is highly desirable as materials such as thermal insulation, filtrations to vacuum oven and high temperature high frequency thereof.
Subordinate list: the foamy graphite ceramoplastics process flow sheet of type material.(Fig. 1)
1, purification 2, clay 3, SIO
24, AI
2O
3
5, Fe
2O
36, carbide 7, right thing 8, synthetic
9, pore-creating catalytic agent 10, forge burnt 11, broken 12, the abrasive dust in back
13, pitch prill 14, fusing 15, blowing 16, dehydration
17, cooling 18, binding agent 19, phenol 20, formaldehyde
21, Synthetic 22, foamy graphite ceramoplastics 23, porous charcoal pottery
24, sericite 25, Fe
2O
326, catalyzer 27, screening
28, modified asphalt 29, carbonization 30, greying 31, machining
32, finished product 33, paraffin 34, metal-salt 35, filler
36, compacting green compact 37, carbon-pottery 39, porous graphite pottery
39, softening agent 40, weighing preparation 41, mixed kneading lake 42, abrasive dust
43, press-powder 44, preheating 45, cold pressing 46, green compact
47 grind sheet 48, extrusion molding hydrogen
Claims (4)
1, a kind of foamy graphite ceramoplastics that is used for vacuum oven, High Temperature Furnaces Heating Apparatus as the adiabatic novel material of high temperature high frequency of thermal insulation material of furnace lining and uses thereof, feature of the present invention is a technical recipe: filler is arranged: modified asphalt (cold grinding) 6-100 granularity order, content is≤10%, potter's clay or clay 6-320 granularity order, content is＜5%; Binding agent is arranged: modified phenolic resins 80-320 granularity order, content is≤15%; Softening agent is arranged: paraffin 80-320 (section) granularity order, content is＜0.5%; Pore-forming material is arranged: rice husk and porous catalytic agent 100-320 granularity order, content is＜56.5%; (sending out) infusion has been arranged: carbonate 100-320 granularity order, content is≤12%; Catalyst Fe is arranged
2O
3, 80-320 granularity order, content are＜1%.(all % counts by weight).
2, by the described foamy graphite ceramoplastics of claim 1, it is characterized in that:
Type material-foamy graphite ceramoplastics the key technical indexes: volume density 0.51-0.20g/cm
3, void content 58-95%, compressive strength 5-11mpa, thermal conductivity (1000 ℃) 0.9-0.11kcaI/mhc, thermal expansivity (1000 ℃) 2.5-3(10
6I/ ℃), than resistance 3000-4600 Ω mm
2/ m, specific heat (1000 ℃) 0.33kcal/kgc.(all % counts by weight).
3, by the manufacture method of the described foamy graphite ceramoplastics of claim 1, it is characterized in that: be to utilize modifying asphalt to be main stuffing, modified phenolic resin adhesive.With purify metals in clay etc. oxide compound and nonmetal sio
2Element and cization thing, so thing synthesizes the pore-creating catalytic agent, is mixed and made into powder.Through paste producing, compressing tablet, abrasive dust, preheating, moulding, charing and greying.And this porous type material is that chemistry, physical change make in the atmosphere of graphitizable high temperature more than 2000 ℃.
4, by the described foamy graphite ceramoplastics of claim 1, it is characterized in that, to vacuum oven and high temperature high frequency thereof as thermal insulation, materials such as filtration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90105112 CN1056892A (en) | 1990-05-18 | 1990-05-18 | The foamy graphite ceramoplastics of type material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90105112 CN1056892A (en) | 1990-05-18 | 1990-05-18 | The foamy graphite ceramoplastics of type material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1056892A true CN1056892A (en) | 1991-12-11 |
Family
ID=4878945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90105112 Pending CN1056892A (en) | 1990-05-18 | 1990-05-18 | The foamy graphite ceramoplastics of type material |
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|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999065843A3 (en) * | 1998-05-22 | 2000-02-24 | Allied Signal Inc | Graphitizable foam preform |
| CN100358830C (en) * | 2003-05-09 | 2008-01-02 | 郭森镇 | Reinforced ceramic and its production process |
| CN101755078B (en) * | 2007-07-31 | 2012-06-06 | 北陆成型工业株式会社 | Nozzle member and process for producing the same |
-
1990
- 1990-05-18 CN CN 90105112 patent/CN1056892A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6126874A (en) * | 1997-11-14 | 2000-10-03 | Alliedsignal Inc. | Process of making a graphitizable foam preform |
| WO1999065843A3 (en) * | 1998-05-22 | 2000-02-24 | Allied Signal Inc | Graphitizable foam preform |
| CN100358830C (en) * | 2003-05-09 | 2008-01-02 | 郭森镇 | Reinforced ceramic and its production process |
| CN101755078B (en) * | 2007-07-31 | 2012-06-06 | 北陆成型工业株式会社 | Nozzle member and process for producing the same |
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