CN103113111A - 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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- CN103113111A CN103113111A CN2013100404797A CN201310040479A CN103113111A CN 103113111 A CN103113111 A CN 103113111A CN 2013100404797 A CN2013100404797 A CN 2013100404797A CN 201310040479 A CN201310040479 A CN 201310040479A CN 103113111 A CN103113111 A CN 103113111A
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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 manufacturing of silicon carbide products, particularly a kind of overcurrent part of the silicon carbide material for impeller pump inside---namely 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 living centrifugal force of changing the line of production, and carries out the equipment that liquid is carried.Due to the high speed rotating of impeller, drive liquid and can produce wearing and tearing to cavity and impeller itself, affect the work-ing life of pump, especially shurry pump, be operated under the very high environment of sediment charge, silt is very strong to the wearing and tearing of pump, can only use under mal-condition namely to accuse in hundreds of hours and scrap.
For this reason, adopt the flow passage components of the material manufacturing 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 on the wear-resisting demanding 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 that it is made the liner parts, guarantees that namely 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, decrease the loss of shurry pump.
In the application of silicon carbide on mechanical means, generally adopt the method for coating sintering.And in the manufacturing of aforesaid impeller pump lining body, this method can't be suitable for.
Also having a kind of method of carbofrax material of pressing process commonly used is first compression moulding, then carries out precision work, fires at last.This method has two large shortcomings: the one, and scrap rate is higher, because the controllability of sintering process is lower, the various defectives that can't estimate easily occur, such as product cracking, distortion etc., can only scrap, not only waste product itself, also waste the complete processing in front road; The 2nd, processing difficulties, because the product hardness after sintering is very high, general metalworking cutter can't 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 efficient is very low, and the cost of finished product is also high.This defective is particularly given prominence to (the sintering scrap rate is higher) on the large size product, cause the large size product to produce in enormous quantities.
Summary of the invention
The objective of the invention is utilize carbofrax material described according to background technology as the constructional feature of impeller pump of lining body, invent a kind of manufacture method based on the silicon carbide articles of mould pressing process completely newly.
Method of the present invention is specifically such: be at first to prepare the 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, become the mold pressing blank with the press press forming; In the 3rd step, the mold pressing blank is dried in the shade place to eliminate stress; The 4th, the mold pressing blank is carried out vacuum pre-burning and cooling; Carry out again accurate dimensioned; At last, configure a free silica reactant, be placed in above the mold pressing blank, adopt reaction sintering, six sections 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%; The refinery coke specification is preferably 60 ~ 120 orders.
Can also comprise phenolic aldehyde in powder, content is between 18 ~ 22%.
Described vacuum pre-sinter process, specifically: adopt the vacuum sintering machine, fired 9 ~ 10 hours naturally cooling 12 ~ 15 hours with the temperature of 750 ~ 820 ℃.
Described reaction sintering, six sections sintering process methods specifically refer to minutes 6 sections, temperature are warming up to gently 1600 ℃ ~ 1700 ℃ in 9 ~ 11 hours, and top temperature insulation 3 ~ 6 hours, adopt at last naturally cooling.
Described silicon carbide articles comprises the cavity liner of silicon carbide impeller and silicon carbide.
Ftractureing after cracking and sintering in processing before the manufacturing process of general silicon carbide articles, sintering is to hinder the subject matter that this series products is promoted, and the present invention has well solved this problem.Method of the present invention has changed accurately machined opportunity, has redesigned component and sintering process, can increase substantially finally that the yield rate of product---yield rate can reach more than 80%, is 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, satisfy silicon carbide articles fully---and especially impeller pump serves as a contrast the hardness requirement of body.The manufacturing cost decrease also can solve the technical bottleneck that large-sized part is made simultaneously.
Embodiment
The below enumerates the entire flow explanation technology contents of the present invention of an embodiment.The present embodiment is the liner parts of making an impeller pump, comprises impeller, knockdown overcurrent cavity, and wherein impeller is integral unit, and the combined overcurrent cavity is to have the multi-disc component combination to form, and purpose 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 purpose refinery coke 4%, all the other are polyurethane polyureas mixture.Above-mentioned materials is put into the mist projection granulating tower fully be mixed into mixture.
Second embodiment, can also adopt following ratio: W14 silicon carbide micro-powder 52%, W10 silicon carbide micro-powder 18%, phenolic aldehyde (2123 resin) 20%, propylene glycol 0.3%, polyurethane polyureas mixture 5%, all the other are 100 purpose refinery cokes.
In the powder of this compacting use, silicon carbide micro-powder is still main component, and phenolic aldehyde, propylene glycol and polyurethane polyureas mixture are that the main component of refinery coke is carbon as the compacting tackiness agent, be used for reacting at the silicon of sintering neutralization reaction, generation be still silicon carbide.
Two, press forming
According to the shape of product that will make, 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 that configures is quantitatively put into mould.According to the product size, select suitable press to be suppressed into the mold pressing blank, the pressing pressure of general silicon carbide products need to reach 200 ~ 280kg/cm
2This 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 under the effect of tackiness agent and not loose.
Three, the mold pressing blank dries in the shade and eliminates stress
Drying in the shade is understandable technique in industry, benly is: humidity remains on 80% left and right, and 20 ℃ of envrionment temperatures ideally need 5 ~ 10 days, select naturally dry in the shade in 7 days in the present embodiment.
Four, presintering
The mold pressing blank is put into vacuum sintering furnace carry out the vacuum pre-burning, 820 ℃ of temperature were fired 10 hours, naturally cooling 13 hours.In the process of presintering, chemical transformation has occured in product, and phenolic aldehyde wherein, propylene glycol and polyurethane polyureas mixture have reacted rear disappearance, owing to itself being exactly carbohydrate, so through become carbonic acid gas after reaction and water is eliminated from the mold pressing blank.The hardness that whole product reaches still is in the category processed of general processing units at below 10% of finished product, and stability and the intensity of structure, shape all relatively are suitable for mechanical workout.
Five, be machined to the size that needs
Use the various processors such as lathe, planer, machining center to carry out geometry processing to the blank of presintering.Size and the out of true of the mold pressing blank of die forming, and through presintering, error is larger.The purpose 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, is as good as so the processing of this moment and general metal are processed, and is very convenient.
Six, reaction sintering
At last, 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, it is stacked that the silicon (free silica) that configures respectively a same size is placed in blank top contact.Adopt six sections temperature-raising method sintering, described six sections temperature-raising methods are commonly usedly 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, the whole needs of the present embodiment naturally cooling approximately 20 hours.
After reaction sintering, whole product size does not have considerable change after precision work, before sintering, can satisfy general accuracy requirement, in particular for the flow passage components of the impeller pump of the present embodiment.The silicon carbide articles of this moment is 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 the 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, realized breaking through in three broad aspect of yield rate, finish size and processed complex degree, will significantly promote the industry progress.
Through test, the impeller pump lining body, the impeller that adopt above-mentioned carbofrax material to make, the outside is fixed, seals with metal, rubber and approximate material, the impeller pump of the silicon carbide lining of making, when being used for shurry pump, surpass 5 ~ 20 times of common stainless steel pumps, decrease use cost work-ing life.
Claims (7)
1. be used for the manufacture method of the silicon carbide articles of impeller pump, it is characterized in that: be at first to prepare the 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, become the mold pressing blank with the press press forming; In the 3rd step, the mold pressing blank is dried in the shade place to eliminate stress; The 4th, the mold pressing blank is carried out vacuum pre-burning and cooling; Carry out again accurate dimensioned; At last, configure a free silica reactant, be placed in the blank top after pre-burning, adopt reaction sintering, six sections 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, is characterized in that
:Described vacuum pre-burning refers to, adopts the vacuum sintering machine, fires 9 ~ 10 hours naturally cooling 12 ~ 15 hours with the temperature of 750 ~ 820 ℃.
6. 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 sintering process methods, specifically refer to minutes six sections, temperature was warming up to gently 1600 ℃ ~ 1700 ℃ in 9 ~ 11 hours, and top temperature insulation 3 ~ 6 hours, adopt at last naturally cooling.
7. 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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| 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112065611A (en) * | 2019-06-10 | 2020-12-11 | 株式会社电装 | Leak diagnosis device |
| CN117183060A (en) * | 2023-09-08 | 2023-12-08 | 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 |
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| 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 |
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- 2013-02-02 CN CN201310040479.7A patent/CN103113111B/en active Active
Patent Citations (4)
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| CN1405120A (en) * | 2002-09-30 | 2003-03-26 | 闻本良 | Injection formation technology for silicon carbide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065611A (en) * | 2019-06-10 | 2020-12-11 | 株式会社电装 | Leak diagnosis device |
| CN117183060A (en) * | 2023-09-08 | 2023-12-08 | 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 |
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| CN103113111B (en) | 2014-08-06 |
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