CN101734919A - Water-based spray granulation process for producing non-pressure sintered silicon carbide product with micropores - Google Patents
Water-based spray granulation process for producing non-pressure sintered silicon carbide product with micropores Download PDFInfo
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- CN101734919A CN101734919A CN200910156687A CN200910156687A CN101734919A CN 101734919 A CN101734919 A CN 101734919A CN 200910156687 A CN200910156687 A CN 200910156687A CN 200910156687 A CN200910156687 A CN 200910156687A CN 101734919 A CN101734919 A CN 101734919A
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Abstract
The invention discloses a water-based spray granulation process for producing a non-pressure sintered silicon carbide product with micropores. The porosity of the product is 5 to 8 percent by volume, wherein the porous structure consists of non-connected closed micropores distributed in a sintered body material. The product is prepared from the following materials in part by weight: 100 parts of alpha-silicon carbide, 1.5 to 8.5 parts of carbon, 0.2 to 2 parts of boron, 0.5 to 5 parts of polyvinyl alcohol, 0.5 to 5 parts of polyethylene glycol and 0.5 to 6 parts of pore-forming agent. The micropores are spherical and have the nominal diameter of 50 to 80mum. The product can be widely applied to a slip ring and a sealing ring, the micropores are circular, and the lubricating effect is quite ideal.
Description
Technical field
The present invention relates to a kind of silicon carbide, refer in particular to a kind of pressureless sintering silicon carbide articles.
Background technology
Carbofrax material not only has remarkable heat, chemistry and mechanical property, and because its adjustable porosity, this material can also be used for frictional behaviour can debatable occasion.Particularly forming between the slipping plane of two relative movement under the dangerous situation of metal to-metal contact owing to lack lubricant, the open micropore that exists on the surface just can play the effect in lubricant reservoir chamber.This specific character can be applicable to slip ring and wear ring.
Since porosity not only can have influence on two between the workpiece friction condition but also can influence the intensity of material, so just need the distribution situation of micropore in the number cells of per unit volume on careful selection pore diameter, the material and the material.Micropore is unsuitable excessive, otherwise can weaken the strength of materials, and its number should not make micropore take place inter-adhesive yet and produce spongy structure, loses its function otherwise may make such as wear ring.On the other hand, micropore can not be too small, otherwise can make as the liquid medium of lubricant because the surface tension of himself and can't penetrate in the micropore and can not fill up micropore or flow out from the hole.
Chinese patent once disclosed a kind of " its slipping plane or trim have the carborundum sintered body of best frictional property " (Germany, publication number CN170104049A, open day on November 23rd, 2005), be that a kind of porosity is the carborundum sintered body of 2 to 12 volume %, vesicular structure wherein is made of the disconnected closed porosity that is evenly distributed in the sintered material, and described micropore is spheric and the nominal diameter with 10 μ m to 48 μ m.
Summary of the invention
The purpose of this invention is to provide a kind of pressureless sintering silicon carbide articles that utilizes water-based spray granulation process production to contain micropore, it can be used as slip ring and wear ring, and lubricant effect is very good.
For achieving the above object, the present invention take scheme be: a kind of water-based spray granulation process production contains the pressureless sintering silicon carbide articles of micropore, its porosity is 5 to 8 volume %, vesicular structure wherein is made of the disconnected closed porosity that is distributed in the sintered material, it is made by following weight part material: 100 parts of alpha-silicon carbides, 1.5 parts～8.5 parts carbon, 0.2 part～2 parts boron, 0.5 part～5 parts polyvinyl alcohol, 0.5 part～5 parts polyoxyethylene glycol, 0.5 part～6 parts pore formers, micropore is spheric and the nominal diameter with 50 μ m～80 μ m.
The production of this kind water-based spray granulation process contains the pressureless sintering silicon carbide of micropore, can be used as slip ring and wear ring, and lubricant effect is very good.
Description of drawings
Fig. 1 be product surface microsection of the present invention light micrograph (SEM) (40X).
Fig. 2 be the light micrograph (SEM) that contains micropore pressureless sintering silicon carbide articles surface microsection produced of domestic certain factory (40X).
Embodiment
Embodiment one:
A kind of water-based spray granulation process production contains the pressureless sintering silicon carbide articles of micropore, its porosity is 5 to 8 volume %, vesicular structure wherein is made of the disconnected closed porosity that is distributed in the sintered material, it is made by following weight part material: 100 parts of alpha-silicon carbides, 1.5 parts～8.5 parts carbon, 0.2 part～2 parts boron, 0.5 part～5 parts polyvinyl alcohol, 0.5 part～5 parts polyoxyethylene glycol, 0.5 part～6 parts pore formers, micropore is spheric and the nominal diameter with 50 μ m～80 μ m.
Its product surface microsection (SEM) is seen Fig. 1, compares with the micropore pressureless sintering silicon carbide articles (see figure 2) that contains that domestic certain factory produces, and micropore is round, and lubricant effect is better.
A kind of production contains the water-based spray granulation process of micropore pressureless sintering silicon carbide, and its step is as follows:
(1) be to add deionized water after 100 parts of alpha-silicon carbides, 1.5 parts～8.5 parts carbon, 0.2 part～2 parts boron, 0.5 part～5 parts polyvinyl alcohol, 0.5 part～5 parts polyoxyethylene glycol, 0.5 part～6 parts pore former proportionings with weight part, ball milling mixes after 12 hours～24 hours, and being mixed with the solid phase weight content is 40%～60% water base silicon carbide compound slurry;
(2) adopt atomizing granulating technology that above-mentioned water base silicon carbide compound slurry is carried out spraying drying, obtain silicon carbide granulating powder; The hot blast inlet temperature is 200 ℃～250 ℃;
(3) above-mentioned silicon carbide granulating powder is adopted 140MPa dry-pressing precompressed and the moulding of 200MPa cold isostatic pressing end pressing two-step mode, obtain highdensity sealing material base substrate;
(4) the sealing material base substrate with above-specified high density is placed in the vacuum non-pressure sintering furnace, is warming up to 2000 ℃～2100 ℃, is incubated 1 hour～1.5 hours, obtains containing the pressureless sintering silicon carbide articles of micropore after sintering finishes.
Need to prove that the solid phase weight content described in the step (1) is 40%～60% water base silicon carbide slip, its solid phase weight content is meant: (main raw material) ÷ (main raw material+deionized water)=40%～60%.
Embodiment two:
A kind of water-based spray granulation process production contains the pressureless sintering silicon carbide of micropore, its porosity is 5 to 8 volume %, vesicular structure wherein is made of the disconnected closed porosity that is distributed in the sintered material, it is made by following material: 100Kg alpha-silicon carbide, 1.5Kg carbon, 0.2Kg boron, 0.5Kg polyvinyl alcohol, 0.5Kg polyoxyethylene glycol, 0.5Kg pore former, micropore are spheric and the nominal diameter with 50 μ m～80 μ m.
A kind of production contains the water-based spray granulation process of micropore pressureless sintering silicon carbide, and its step is as follows:
(1) 100Kg alpha-silicon carbide, 1.5Kg carbon, 0.2Kg boron, 0.5Kg polyvinyl alcohol, 0.5Kg polyoxyethylene glycol, 0.5Kg pore former are mixed the back and add deionized water, ball milling mixes after 12 hours～24 hours, and being mixed with the solid phase weight content is 40%～60% water base silicon carbide compound slurry;
(2), (3), (4) are with embodiment one.
Embodiment three:
A kind of water-based spray granulation process production contains the pressureless sintering silicon carbide of micropore, its porosity is 5 to 8 volume %, vesicular structure wherein is made of the disconnected closed porosity that is distributed in the sintered material, it is made by following material: 100Kg alpha-silicon carbide, 8.5Kg carbon, 2Kg boron, 5Kg polyvinyl alcohol, 5Kg polyoxyethylene glycol, 6Kg pore former, micropore are spheric and the nominal diameter with 50 μ m～80 μ m.
A kind of production contains the water-based spray granulation process of micropore pressureless sintering silicon carbide, and its step is as follows:
(1) 100Kg alpha-silicon carbide, 8.5Kg carbon, 2Kg boron, 5Kg polyvinyl alcohol, 5Kg polyoxyethylene glycol, 6Kg pore former are mixed the back and add deionized water, ball milling mixes after 12 hours～24 hours, and being mixed with the solid phase weight content is 40%～60% water base silicon carbide compound slurry;
(2), (3), (4) are with embodiment one.
Embodiment four:
A kind of water-based spray granulation process production contains the pressureless sintering silicon carbide of micropore, its porosity is 5 to 8 volume %, vesicular structure wherein is made of the disconnected closed porosity that is distributed in the sintered material, it is made by following material: 100Kg alpha-silicon carbide, 6.5Kg carbon, 1Kg boron, 5Kg polyvinyl alcohol, 5Kg polyoxyethylene glycol, 3Kg pore former, micropore are spheric and the nominal diameter with 50 μ m～80 μ m.
A kind of production contains the water-based spray granulation process of micropore pressureless sintering silicon carbide, and its step is as follows:
(1) 100Kg alpha-silicon carbide, 6.5Kg carbon, 1Kg boron, 5Kg polyvinyl alcohol, 5Kg polyoxyethylene glycol, 3Kg pore former are mixed the back and add deionized water, ball milling mixes after 12 hours～24 hours, and being mixed with the solid phase weight content is 40%～60% water base silicon carbide compound slurry;
(2), (3), (4) are with embodiment one.
Embodiment five:
A kind of water-based spray granulation process production contains the pressureless sintering silicon carbide of micropore, its porosity is 5 to 8 volume %, vesicular structure wherein is made of the disconnected closed porosity that is distributed in the sintered material, it is made by following material: 100Kg alpha-silicon carbide, 5Kg carbon, 1.1Kg boron, 2.75Kg polyvinyl alcohol, 2.75Kg polyoxyethylene glycol, 3.25Kg pore former, micropore are spheric and the nominal diameter with 50 μ m～80 μ m.
A kind of production contains the water-based spray granulation process of micropore pressureless sintering silicon carbide, and its step is as follows:
(1) 100Kg alpha-silicon carbide, 5Kg carbon, 1.1Kg boron, 2.75Kg polyvinyl alcohol, 2.75Kg polyoxyethylene glycol, 3.25Kg pore former are mixed the back and add deionized water, ball milling mixes after 12 hours～24 hours, and being mixed with the solid phase weight content is 40%～60% water base silicon carbide compound slurry;
(2), (3), (4) are with embodiment one.
Claims (2)
1. a water-based spray granulation process production contains the pressureless sintering silicon carbide articles of micropore, its porosity is 5 to 8 volume %, vesicular structure wherein is made of the disconnected closed porosity that is distributed in the sintered material, it is characterized in that: it is made by following weight part material: 100 parts of alpha-silicon carbides, 1.5 parts～8.5 parts carbon, 0.2 part～2 parts boron, 0.5 part～5 parts polyvinyl alcohol, 0.5 part～5 parts polyoxyethylene glycol, 0.5 part～6 parts pore formers, micropore is spheric and the nominal diameter with 50 μ m～80 μ m.
2. a production contains the water-based spray granulation process of micropore pressureless sintering silicon carbide, and it is characterized in that: its step is as follows:
(1) be to add deionized water after 100 parts of alpha-silicon carbides, 1.5 parts～8.5 parts carbon, 0.2 part～2 parts boron, 0.5 part～5 parts polyvinyl alcohol, 0.5 part～5 parts polyoxyethylene glycol, 0.5 part～6 parts pore former proportionings with weight part, ball milling mixes after 12 hours～24 hours, and being mixed with the solid phase weight content is 40%～60% water base silicon carbide compound slurry;
(2) adopt atomizing granulating technology that above-mentioned water base silicon carbide compound slurry is carried out spraying drying, obtain silicon carbide granulating powder; The hot blast inlet temperature is 200 ℃～250 ℃;
(3) above-mentioned silicon carbide granulating powder is adopted 140MPa dry-pressing precompressed and the moulding of 200MPa cold isostatic pressing end pressing two-step mode, obtain highdensity sealing material base substrate;
(4) the sealing material base substrate with above-specified high density is placed in the vacuum non-pressure sintering furnace, is warming up to 2000 ℃～2100 ℃, is incubated 1 hour～1.5 hours, obtains containing the pressureless sintering silicon carbide articles of micropore after sintering finishes.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106032324B (en) * | 2016-04-06 | 2018-11-06 | 中国科学院金属研究所 | A kind of synthesis main phase is Ti2The method of the spherical MAX phases powder body material of AlC |
| CN116768630A (en) * | 2023-05-22 | 2023-09-19 | 铜陵优必胜新材料科技有限公司 | Preparation method of microporous carbon-containing silicon carbide sealing element |
-
2009
- 2009-12-28 CN CN200910156687A patent/CN101734919A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106032324B (en) * | 2016-04-06 | 2018-11-06 | 中国科学院金属研究所 | A kind of synthesis main phase is Ti2The method of the spherical MAX phases powder body material of AlC |
| CN116768630A (en) * | 2023-05-22 | 2023-09-19 | 铜陵优必胜新材料科技有限公司 | Preparation method of microporous carbon-containing silicon carbide sealing element |
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Application publication date: 20100616 |