CN103113111B - Manufacturing method of silicon carbide product for centrifugal pump - Google Patents
Manufacturing method of silicon carbide product for centrifugal pump Download PDFInfo
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- CN103113111B CN103113111B CN201310040479.7A CN201310040479A CN103113111B CN 103113111 B CN103113111 B CN 103113111B CN 201310040479 A CN201310040479 A CN 201310040479A CN 103113111 B CN103113111 B CN 103113111B
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- silicon carbide
- powder
- sintering
- manufacture method
- impeller pump
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 45
- 238000005245 sintering Methods 0.000 claims abstract description 38
- 239000000843 powder Substances 0.000 claims abstract description 29
- 238000003825 pressing Methods 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 10
- -1 phenolic aldehyde Chemical class 0.000 claims abstract description 9
- 229920002635 polyurethane Polymers 0.000 claims abstract description 9
- 239000004814 polyurethane Substances 0.000 claims abstract description 9
- 239000000376 reactant Substances 0.000 claims abstract description 4
- 239000011812 mixed powder Substances 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 11
- 229920002396 Polyurea Polymers 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000571 coke Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000005056 compaction Methods 0.000 abstract 2
- 238000001035 drying Methods 0.000 abstract 1
- 230000000379 polymerizing effect Effects 0.000 abstract 1
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 6
- 238000005336 cracking Methods 0.000 description 4
- 230000003245 working effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Ceramic Products (AREA)
Abstract
The invention discloses a manufacturing method of a silicon carbide product for a centrifugal pump. The manufacturing method comprises the following steps of: firstly, preparing a compaction powder material, wherein the powder material comprises 70-85 percent of silicon carbide micro-powder, and 1-5 percent of phenolic aldehyde and polyurethane polymerizing agent; putting the fully-mixed powder material into a mould and compacting by virtue of a compaction machine to form a mould pressing blank piece; drying the mould pressing blank piece in the shade to eliminate the stress; pre-burning the mould pressing blank piece in a vacuum mode and cooling; performing accurate size processing; and finally, preparing a free silicon reactant, putting the free silicon reactant above the pre-burned blank piece, and sintering by using process methods of reaction sintering and six-section sintering. By using the method, the defects of low finished product rate, incapability of carrying out size processing of products and complicated shapes in the prior art are overcome, and the silicon carbide product is manufactured to be the centrifugal pump, so that the service life is long, and the production cost is low.
Description
Technical field
The present invention relates to a kind of manufacture of silicon carbide products, particularly a kind of overcurrent part of the silicon carbide material for impeller pump inside---be called the manufacture method of the goods that serve as a contrast body.
Background technology
Impeller pump is to utilize impeller at the pump housing cavity inward turning raw centrifugal force of changing the line of production, the equipment that carries out liquid conveying.Due to the high speed rotating of impeller, drive liquid to produce wearing and tearing to cavity and impeller itself, affect the work-ing life of pump, especially shurry pump, be operated under the environment that sediment charge is very high, silt is very strong to the wearing and tearing of pump, can only use and accuse and scrap for hundreds of hours under mal-condition.
For this reason, adopt the flow passage components of the material manufacture pump of various high rigidity, as stainless steel, highstrenghtpiston etc., but cost is high and wear resisting property is still not high.On the other hand, a kind of novel stupalith---silicon carbide (SiC) is found to have very high hardness, has been widely used in wear-resisting the requirements on high equipment such as mine hopper.Because but its hardness is high crisp, so the difficulty that is shaped, anti-impact force is poor.
Carbofrax material is in the application of pump, and existing a kind of modern technique is made liner parts, guarantees that flow passage components are all carbofrax materials: the cavity and the impeller that comprise the pump housing.All material for flow of this pump are all that carbofrax material is made, and hardness is high, wear resisting property good, can reach even hundreds of times of the decades of times of general traditional stainless material pump work-ing life, have significantly reduced the loss of shurry pump.
In the application of silicon carbide in mechanical means, generally adopt the method for coating sintering.And in the manufacture of aforesaid impeller pump lining body, this method cannot be suitable for.
A kind of method that also has carbofrax material of conventional pressing process is first compression moulding, then carries out precision work, finally fires.This method has two large shortcomings: the one, and scrap rate is higher, because the controllability of sintering process is lower, easily occurs the various defects that cannot estimate, such as product cracking, distortion etc., can only scrap, not only waste product itself, also waste the complete processing in Liao Qian road; The 2nd, processing difficulties, because the product hardness after sintering is very high, general metalworking cutter cannot be competent at, so tooling cost is very high, and also extremely difficult especially for the product of complicated shape.On the whole, this manufacturing process efficiency is very low, and the cost of finished product is also high.This defect is particularly given prominence to (sintering scrap rate is higher) on large size product, causes large size product to produce in enormous quantities.
Summary of the invention
The object of the invention is, according to utilizing carbofrax material as the constructional feature of impeller pump of lining body described in background technology, to invent a kind of manufacture method of the brand-new silicon carbide articles based on mould pressing process.
Method of the present invention is specifically such: be first to prepare compacting powder, described powder comprises silicon carbide micro-powder, phenolic aldehyde and polyurethane polyureas mixture; Wherein polyurethane polyureas mixture content is 1 ~ 5%; Silicon carbide micro-powder content is 70 ~ 85%; Then well-mixed powder is put into mould, with press press forming, become mold pressing blank; The 3rd step, dries in the shade mold pressing blank to place to eliminate stress; The 4th, mold pressing blank is carried out to vacuum pre-burning cooling; Carry out again accurate dimensioned; Finally, configure a free silica reactant, be placed in mold pressing blank top, adopt reaction sintering, six sections of sintering process methods to carry out sintering.
In above-mentioned method, the silicon carbide micro-powder in preferred powder comprises that granularity is that W14 and granularity are two kinds of W10, and ratio is 0.2 < W10:W14 < 0.5.
In further preferred silicon carbide micro-powder, also comprise refinery coke, content is between 2% ~ 5%; Refinery coke specification is preferably 60 ~ 120 orders.
In powder, can also comprise phenolic aldehyde, content is between 18 ~ 22%.
Described vacuum pre-sinter process, specifically: adopt vacuum sintering machine, with the temperature of 750 ~ 820 ℃, fire 9 ~ 10 hours naturally cooling 12 ~ 15 hours.
Described reaction sintering, six sections of sintering process methods, specifically refer to minutes 6 sections, in 9 ~ 11 hours, temperature is warming up to gently to 1600 ℃ ~ 1700 ℃, and top temperature insulation 3 ~ 6 hours, finally adopt naturally cooling.
Described silicon carbide articles comprises the cavity liner of silicon carbide impeller and silicon carbide.
The manufacturing process of general silicon carbide articles, in processing before sintering, after cracking and sintering, cracking is to hinder the subject matter that this series products is promoted, the present invention has well solved this problem.Method of the present invention has changed accurately machined opportunity, has redesigned component and sintering process, finally can increase substantially that the yield rate of product---yield rate can reach more than 80%, is the more than 5 times of existing general technology; In silicon carbide articles after sintering, silicon carbide, contents of free si are greater than 95%, and product hardness reaches HRA80 ~ 85, meet silicon carbide articles completely---and especially impeller pump serves as a contrast the hardness requirement of body.Manufacturing cost significantly reduces, and also can solve the technical bottleneck that large-sized part is manufactured simultaneously.
Embodiment
The entire flow of enumerating an embodiment below illustrates technology contents of the present invention.The present embodiment is the liner parts of manufacturing an impeller pump, comprises impeller, knockdown overcurrent cavity, and wherein impeller is integral unit, and combined overcurrent cavity is to have multi-disc component combination to form, and object is to be convenient to processing.
One, configuration compacting powder
The batching of powder and a preferred ratio are as follows: W14 silicon carbide micro-powder 55%, and W10 silicon carbide micro-powder 18%, phenolic aldehyde (2123 resin) 19%, propylene glycol 0.5%, 70 object refinery coke 4%, all the other are polyurethane polyureas mixture.Above-mentioned materials is put into mist projection granulating tower and be fully mixed into mixture.
Second embodiment, can also adopt following ratio: W14 silicon carbide micro-powder 52%, and W10 silicon carbide micro-powder 18%, phenolic aldehyde (2123 resin) 20%, propylene glycol 0.3%, polyurethane polyureas mixture 5%, all the other are 100 object refinery cokes.
This compacting use powder in, silicon carbide micro-powder is still main component, phenolic aldehyde, propylene glycol and polyurethane polyureas mixture be as compacting tackiness agent, the main component of refinery coke is carbon, for the silicon in sintering neutralization reaction, react, generation be still silicon carbide.
Two, press forming
According to the shape of product that will manufacture, according to general pressing process, prepare compacting tool set.According to the requirement of the present embodiment, be respectively impeller mold and a plurality of cavity subassembly mould, each mould can Reusability certainly, produces many cover products.
The powder configuring is quantitatively put into mould.According to product size, select suitable press to be suppressed into mold pressing blank, the pressing pressure of general silicon carbide products need to reach 200 ~ 280kg/cm
2.This step is identical with existing pressing process, is that those skilled in that art are known.In this process procedure, be a physical change, powder is compacted, can condense and not loose under the effect of tackiness agent.
Three, mold pressing blank dries in the shade and eliminates stress
Dry in the shade and be understandable technique in industry, ben: humidity remains on 80% left and right, 20 ℃ of envrionment temperatures ideally, need 5 ~ 10 days, select within 7 days, naturally dry in the shade in the present embodiment.
Four, presintering
Mold pressing blank is put into vacuum sintering furnace and carry out vacuum pre-burning, 820 ℃ of temperature, fire 10 hours, naturally cooling 13 hours.In the process of presintering, there is chemical transformation in product, and phenolic aldehyde wherein, propylene glycol and polyurethane polyureas mixture have reacted rear disappearance, owing to itself being exactly carbohydrate, so become carbonic acid gas and water is eliminated from mold pressing blank after reaction.The hardness that whole product reaches is at below 10% of finished product, and still in the category processed in general processing units, and stability and the intensity of structure, shape are all relatively suitable for mechanical workout.
Five, be machined to the size needing
Use the various processors such as lathe, planer, machining center to carry out geometry processing to the blank of presintering.Size the out of true of the mold pressing blank of die forming, and through presintering, error is larger.The object of this road technique is product to be machined to the accurate dimension of finished product actual needs, because the product blank after sintering has aforesaid performance index, so processing now and general metal are processed, is as good as, very convenient.
Six, reaction sintering
Finally, the blank after processing is put into vacuum sintering furnace and carry out reaction sintering.Need to be according to the quality of each different blank, the silicon (free silica) that configures respectively a same size is placed in blank top and contacts stacked.Adopt six sections of temperature-raising method sintering, described six sections of temperature-raising methods are conventionally in industry whole temperature-rise period to be divided into six curve segmentations, to carry out gently, finally reach sintering temperature.The sintering temperature of the present embodiment is set as 1600 ℃, and the whole heating-up time probably needs 9 hours.If sintering temperature is higher, such as 1700 ℃, the heating-up time also can correspondingly increase.Temperature is incubated 3 ~ 6 hours after arriving, and the present embodiment adopts insulation 5 hours.Process of cooling is different from traditional method, and traditional method is to adopt water-cooled, and the present invention is naturally cooling, and the present embodiment naturally cooling is whole need to approximately 20 hours.
After reaction sintering, whole product size does not have considerable change after precision work, before sintering, can meet general accuracy requirement, in particular for the flow passage components of the impeller pump of the present embodiment.Silicon carbide articles is now finished product, its composition silicon carbide (SiC) is greater than 80%, free silica fills up the molecule gap between silicon carbide, content surpasses 15%, the impurity that other complicated ingredients are difficult to pyrolytic decomposition is less than 5%, and product hardness reaches HRA(Rockwell hardness) 80 ~ 85, far above general stainless material, this hardness can effectively be resisted the wearing and tearing of slip to the pump housing in the use of shurry pump, the work-ing life of improving whole pump.
Through practice, processing method of the present invention, due to the improvement of the powder composition of preparing, has improved the intensity of mold pressing blank, can effectively overcome the front problem with regard to cracking of sintering of general carbofrax material goods processing.And carried out rationally effectively eliminating before final sintering for the stress of mold pressing blank, be also one of effective technology means that improve sintering finished rate.Thus, the invention solves the production technology bottleneck of existing silicon carbide articles, three broad aspect that realized at yield rate, finish size and processed complex degree break through, and will significantly promote industry progress.
Through test, the impeller pump lining body, the impeller that adopt above-mentioned carbofrax material to make, outside is fixed, seals with metal, rubber and approximate material, the impeller pump of the silicon carbide lining of making, in the time of for shurry pump, surpass 5 ~ 20 times of common stainless steel pumps work-ing life, significantly reduces use cost.
Claims (6)
1. for the manufacture method of the silicon carbide articles of impeller pump, it is characterized in that: be first to prepare compacting powder, described powder comprises silicon carbide micro-powder, phenolic aldehyde and polyurethane polyureas mixture; Wherein polyurethane polyureas mixture content is 1 ~ 5%; Silicon carbide micro-powder content is 70 ~ 85%; Then well-mixed powder is put into mould, with press press forming, become mold pressing blank; The 3rd step, dries in the shade mold pressing blank to place to eliminate stress; The 4th, to mold pressing blank, adopt vacuum sintering machine to carry out vacuum pre-burning, with the temperature of 750 ~ 820 ℃, fire 9 ~ 10 hours, then naturally cooling is 12 ~ 15 hours; Carry out again accurate dimensioned; Finally, configure a free silica reactant, be placed in the blank top after pre-burning, adopt reaction sintering, six sections of sintering process methods to carry out sintering.
2. the manufacture method of the silicon carbide articles for impeller pump according to claim 1, is characterized in that
:silicon carbide micro-powder in described powder comprises that granularity is that W14 and granularity are two kinds of W10, and both ratios are 0.2 < W10:W14 < 0.5.
3. the manufacture method of the silicon carbide articles for impeller pump according to claim 1, is characterized in that
:described phenolic aldehyde is 2123 resins specifically, and content is between 18 ~ 22%.
4. the manufacture method of the silicon carbide articles for impeller pump according to claim 1 and 2, is characterized in that
:in described silicon carbide micro-powder, also comprise refinery coke, content is between 2% ~ 5%.
5. the manufacture method of the silicon carbide articles for impeller pump according to claim 1, it is characterized in that: described reaction sintering, six sections of sintering process methods, specifically refer to minutes six sections, in 9 ~ 11 hours, temperature is warming up to gently to 1600 ℃ ~ 1700 ℃, and top temperature insulation 3 ~ 6 hours, finally adopt naturally cooling.
6. the manufacture method of the silicon carbide articles for impeller pump according to claim 1, is characterized in that
:described silicon carbide articles comprises the cavity liner of silicon carbide impeller and silicon carbide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310040479.7A CN103113111B (en) | 2013-02-02 | 2013-02-02 | Manufacturing method of silicon carbide product for centrifugal pump |
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| CN201310040479.7A CN103113111B (en) | 2013-02-02 | 2013-02-02 | Manufacturing method of silicon carbide product for centrifugal pump |
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| CN103113111A CN103113111A (en) | 2013-05-22 |
| CN103113111B true CN103113111B (en) | 2014-08-06 |
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| JP2020200793A (en) * | 2019-06-10 | 2020-12-17 | 株式会社デンソー | Leakage diagnostic device |
| CN117183060B (en) * | 2023-09-08 | 2024-08-06 | 南通三责精密陶瓷有限公司 | Production device of silicon carbide lining cylinder of sand mill and application method of production device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1405120A (en) * | 2002-09-30 | 2003-03-26 | 闻本良 | Injection formation technology for silicon carbide |
| CN101555143A (en) * | 2009-05-12 | 2009-10-14 | 宁波欧翔精细陶瓷技术有限公司 | Preparation method of normal pressure-sintered silicon carbide ceramics |
| CN102875150A (en) * | 2012-10-16 | 2013-01-16 | 北京科技大学 | Method for preparing silicon carbide ceramic impeller through gel casting and pressureless sintering |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5735501B2 (en) * | 2009-07-07 | 2015-06-17 | モーガン・アドヴァンスト・マテリアルズ・アンド・テクノロジー・インコーポレイテッドＭｏｒｇａｎ Ａｄｖａｎｃｅｄ Ｍａｔｅｒｉａｌｓ Ａｎｄ Ｔｅｃｈｎｏｌｏｇｙ Ｉｎｃ． | Hard non-oxide or oxide ceramic / hard non-oxide or oxide ceramic composite hybrid seal parts |
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Patent Citations (3)
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|---|---|---|---|---|
| CN1405120A (en) * | 2002-09-30 | 2003-03-26 | 闻本良 | Injection formation technology for silicon carbide |
| CN101555143A (en) * | 2009-05-12 | 2009-10-14 | 宁波欧翔精细陶瓷技术有限公司 | Preparation method of normal pressure-sintered silicon carbide ceramics |
| CN102875150A (en) * | 2012-10-16 | 2013-01-16 | 北京科技大学 | Method for preparing silicon carbide ceramic impeller through gel casting and pressureless sintering |
Non-Patent Citations (4)
| Title |
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