CN202812654U - Recrystal silicon carbide composite bend - Google Patents
Recrystal silicon carbide composite bend Download PDFInfo
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- CN202812654U CN202812654U CN 201220402610 CN201220402610U CN202812654U CN 202812654 U CN202812654 U CN 202812654U CN 201220402610 CN201220402610 CN 201220402610 CN 201220402610 U CN201220402610 U CN 201220402610U CN 202812654 U CN202812654 U CN 202812654U
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- silicon carbide
- carbide composite
- recrystal
- recrystallized silicon
- bend pipe
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Abstract
The utility model relates to a recrystal silicon carbide composite bend which comprises a metal casing and an abrasion-resistant layer arranged on the inner wall of the metal casing in a composite mode, and the abrasion-resistant layer is a recrystal silicon carbide composite liner tube. The recrystal silicon carbide composite bend is good in abrasion resistance, compact in structure, resistant to acid and alkali erosion, smooth and clean in surface and suitable for abrasion-resistant operation under various severe working conditions. The recrystal silicon carbide composite bend has a smooth curve, does not deform under the condition of high temperature, and is not blocked. Strength is not reduced, powder materials are not retained, and the recrystal silicon carbide composite bend has great importance in improving production efficiency, saving energy, reducing leakage, ensuring production safety, improving working environment and greatly reducing repairing cost.
Description
Technical field
The utility model relates to a kind of abrasion-proof bent tube, is specifically related to a kind of recrystallized silicon carbide composite-curve.
Background technique
Pipe wear is bent wear particularly, is the thorny problem that perplexs for a long time industrial enterprise, and directly has influence on economic benefit and the work on the spot environment of enterprise.At present, abrasion-proof bent tube roughly has 4 types on the market: the one, the cast stone bend pipe, shortcoming be frangible, easy to crack, (30～40mm) heavinesses have bulge to wall thickness, inconvenience is installed, and often there is pore inside, easily stays hidden danger, in case worn out, the scene is difficult to repair, and uses now less; The 2nd, cast steel bend pipe (comprising alloyed steel) is widely used in the abrasionproof field, but because material and process limitations, its surface hardness lower (about Rockwell hardness 60), far below pottery (Rockwell hardness is more than 80), wear-resisting property only is equivalent to 1/tens of pottery.In addition, cast steel bend pipe thickness is large, and very heavy, weldability is poor, the installation and maintenance difficulty; The 3rd, centrifugal pressure casting composite ceramics bend pipe, this process using self-propagating combustion centrifugal casting forming, the Ceramic Composite pipe internal surface of this method moulding displaces ceramic layer, compare with the cast steel alloy bend pipe, wear-resisting property improves to some extent, but because the reaction time is short, aluminium oxide and molten iron centrifugation are not thoroughly, pore is more, ceramic layer is fine and close not, rough surface, hardness is more than 80.In addition, this technique can only be done straight tube, if do bend pipe, needs that straight tube is cut apart some sections and is welded into bend pipe, and inwall is not streamlined after the moulding, hinders mass transport, and weld joint leakage easy to wear.The 4th, the ceramic paster bend pipe, owing to limit by processing technology, this product only is adapted to the short bend pipe of major diameter, because the slit is more between the stickup ceramics, is not circular arc between the ceramics, in high temperature or large flow velocity environment, wearing and tearing easily come off.
Summary of the invention
The technical problems to be solved in the utility model provides that a kind of compact structure, wear-resisting property are good, long service life, recrystallized silicon carbide composite-curve that the operation maintenance expense is low.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
Design a kind of recrystallized silicon carbide composite-curve that comprises the metallic support bend pipe and be compound in the wearing layer of its inwall, its wearing layer is the recrystallized silicon carbide bushing pipe.
Above-mentioned recrystallized silicon carbide lining pipe by following raw material through slurrying, moulding by casting, 2450～2550 ℃ of layers that lower sintering forms: purity 〉=99.5%, granularity are silicon carbide micro-powder 88～92wt%, the rare-earth yttrium auxiliary agent 8～12wt% of 0～150um; In described silicon carbide micro-powder, granularity is that account for 25～35 wt%, granularity of 0～1um are that the account for 15～25wt%, granularity of 1～5um is that to account for 15～25wt%, granularity be that the silicon carbide micro-powder of 125～150um accounts for 25～35 wt% for the silicon carbide micro-powder of 10～63um; The acute angle shape particle accounts for 25～30wt% in the described silicon carbide micro-powder, and obtuse angle shape particle accounts for 70～75wt%.
Described recrystallized silicon carbide liner bend pipe is spliced successively by some segmentations bushing pipe.
Between described metallic support bend pipe and wearing layer, be provided with heat-resisting packed layer.
Described heat-resisting packed layer is alumina silicate fiber felt.
Above-mentioned recrystallized silicon carbide composite-curve can be made via following steps:
(1) prepares metal shell and bushing pipe layer core rod according to the Dimensions of design;
(2) produce plaster pattern according to bushing pipe layer core rod;
(3) choose the raw material of making the recrystallized silicon carbide bushing pipe according to the above-mentioned raw materials proportioning, behind the batch mixing, adding water to phosphoric acid is 500～600 pools, and Vacuum Mixture is 20～30 hours again; After slip is mixed, pour into a mould with plaster pattern on casting platform, the green compact that casting is good are placed the demoulding after 2～3 hours; Again with the green compact after demoulding oven dry, behind the dimensioned repaired biscuit by described requirement, dry again to moisture content below 2%; Green compact are set high carry out sintering in the warm vacuum furnace, heating rate with 3～5 ℃/minute under vacuum state heats up, when temperature rises to 1100 ℃, being filled with inert gas makes furnace pressure reach 1.5～2.5MPa, continuation is warming up to 2450～2550 ℃ with 2 ℃/minute heating rate, then be incubated 1.5～2.5 hours, naturally cooling is come out of the stove when temperature is down to below 150 ℃ and is got the recrystallized silicon carbide bushing pipe again;
(4) the recrystallized silicon carbide bushing pipe is embedded in after with heat-resisting stuffing parcel in the metallic support bend pipe that is complementary.
In described step (3), the degree of vacuum when Vacuum Mixture and vacuum heat up is 2～5mPa.
Described inert gas is argon gas.
In described step (4), when the required heat resisting temperature of recrystallized silicon carbide composite-curve＜200 ℃, take the alumina silicate fiber felt that is coated with aluminium dihydrogen phosphate as heat-resisting stuffing, after namely wrapping up above-mentioned recrystallized silicon carbide bushing pipe with the alumina silicate fiber felt that scribbles aluminium dihydrogen phosphate, again it is embedded in the metallic support bend pipe that is complementary that bends; When the required heat resisting temperature of recrystallized silicon carbide composite-curve 〉=200 ℃, take the high aluminum fiber felt as heat-resisting stuffing, namely with behind the high aluminum fiber felt parcel recrystallized silicon carbide bushing pipe, it is embedded in the metallic support bend pipe that is complementary that bends, and (particle diameter 0.1～0.5mm) is by the mixture that mass ratio the was formed sealing of 1:4～6 or fill clearance with aluminium dihydrogen phosphate and silicon-carbide particle again.So, can firmly the recrystallized silicon carbide bushing pipe be fixed in unlikely coming off in the support bend pipe, again support bend pipe be met that heat is swollen to rise, meet cold contraction and leave surplus, to avoid the support bend pipe recrystallized silicon carbide bushing pipe of bursting or crush.
The utlity model has actively useful effect:
1. the utility model recrystallized silicon carbide composite-curve is compared other material bend pipe wear-resisting property and is significantly promoted.Measure through Northwestern Polytechnical University, the utility model recrystallized silicon carbide abrasion-proof bent tube Mohs hardness is only second to diamond (Mohs hardness 10) more than 9.5.
2. the weight of the utility model recrystallization abrasion-proof bent tube only is with 1/3 of the cast steel bend pipe of volume, and supporting steel pipe only needs common steel tube to get final product, and adopts the utility model product can save the alloy material of lower a large amount of costlinesses.
3. the utility model recrystallized silicon carbide can anti-1400 ℃ of high temperature, and indeformable, intensity does not reduce, and the tackiness agent of filling can anti-800 ℃ high temperature.Because it belongs to inorganic material, oxidation corrosion can not occur, and the acid resistant alkali abrasion.Therefore, adapt to anti-wear operation under the various bad working environments conditions.
4. the utility model recrystallized silicon carbide bushing pipe, compact structure, after the grinding disposing, any surface finish is smooth and be smooth curve, does not stop up, holds back powder.
5. the utility model product can effectively reduce the working site dust leakage, improves working environment, improves operator's health level.
Description of drawings
Fig. 1 is a kind of cross-sectional view of recrystallized silicon carbide composite-curve.
Among the figure, 1 is the steel support bend pipe, and 2 is heat-resisting packed layer, and 3 is the recrystallized silicon carbide bushing pipe, and 4,5,6,7 are the segmentation bushing pipe.
Embodiment
Used raw material etc. if no special instructions, are commercially available among the following embodiment; Method therefor is conventional method if no special instructions.
Embodiment 1: a kind of recrystallized silicon carbide composite-curve, referring to Fig. 1, by comprising successively that outside to inside steel support bend pipe 1, heat-resisting packed layer 2 and wearing layer, this wearing layer are recrystallized silicon carbide bushing pipe 3, this recrystallized silicon carbide liner bend pipe is spliced successively by segmentation bushing pipe 4,5,6,7.
Above-mentioned recrystallized silicon carbide lining pipe is made via following step:
(1) drawing and the Dimensions requirement that provide according to the user bend supporting steel pipe and bushing pipe core rod with intermediate frequency hot bending technology.
(2) make mould according to core rod.
(3) cast recrystallized silicon carbide bushing pipe blank, in the vacuum high temperature furnace sinter molding, specific as follows after the oven dry:
A, select materials: material therefor is silicon carbide micro-powder, and purity is 99.5%, and granularity is 0-150um, and size distribution is that 0-1um accounts for 30%; 1-5um accounts for 20%; 10-63um accounts for 20%; 125-150um accounts for 30%; And the following acute angle particle of 90 degree accounts for the above obtuse angle of 25%, 90 degree particle and accounts for 75%, rare-earth yttrium auxiliary agent 10%.
B, by prescription weighing silicon carbide micro-powder and rare-earth additive batch mixing, adding water to phosphoric acid is 500-600 pool, again Vacuum Mixture 25 hours (degree of vacuum 4mPa).
After C, slip are mixed, pour into a mould with plaster pattern on casting platform, the green compact that casting is good are placed the demoulding after 2.5 hours.
D, with the green compact after demoulding oven dry, press the refine of figure paper size and process, put into again drying room, finally dry to moisture content below 2%.
E, support green compact in vacuum high temperature furnace with the graphite frame and carry out sintering, in the lower intensification of vacuum state (degree of vacuum 3mPa), warming velocity is 4 ℃/minute, temperature is filled with inert gas (argon gas) when rising to 1100 ℃, making furnace pressure is 2.0MPa, continues to be warming up to 2450～2550 ℃, warming velocity is 2 ℃/minute, be incubated 2 hours, more naturally cooling, product is come out of the stove when temperature is down to below 150 ℃.
(4) take the alumina silicate fiber felt that is coated with aluminium dihydrogen phosphate as heat-resisting stuffing, namely wrap up above-mentioned recrystallized silicon carbide bushing pipe with the alumina silicate fiber felt that scribbles aluminium dihydrogen phosphate after, again it is embedded in the metallic support bend pipe that is complementary that bends.More than be applicable to the heat load place of heat resisting temperature＜200 ℃.
Embodiment 2: a kind of recrystallized silicon carbide composite-curve (be applicable to heat resisting temperature 〉=200 ℃ heat load place), its structure and preparation method are substantially the same manner as Example 1, difference is: in described step (4), take the high aluminum fiber felt as heat-resisting stuffing, namely with behind the high aluminum fiber felt parcel recrystallized silicon carbide bushing pipe, it is embedded in the metallic support bend pipe that is complementary that bends, and (particle diameter 0.1～0.5mm) is by the mixture that mass ratio the was formed sealing of 1:5 or fill clearance with aluminium dihydrogen phosphate and silicon-carbide particle again.
The recrystallized silicon carbide composite-curve of preparing the as stated above solder flux factory use more than a year of making a concerted effort through Nanyang Ya He power plant and Zhengzhou, wear-resisting property is good, the abrasion resistant cast steel bend pipe that originally uses and certainly spread the composite ceramics bend pipe, namely need change in two months, estimate to use the utility model recrystallized silicon carbide composite-curve, at least can use 2～3 years, and improve more than working life at least 10～15 times, significantly reduce frequency of maintenance and expense.
Although, above with a general description of the specific embodiments the utility model having been done detailed description, on the utility model basis, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements on the basis of not departing from the utility model spirit all belong to the claimed scope of the utility model.
Claims (4)
1. a recrystallized silicon carbide composite-curve comprises the metallic support bend pipe and is compound in its inboard wearing layer, it is characterized in that, described wearing layer is recrystallized silicon carbide liner bend pipe.
2. recrystallized silicon carbide composite-curve according to claim 1 is characterized in that, described recrystallized silicon carbide liner bend pipe is spliced successively by some segmentations bushing pipe.
3. recrystallized silicon carbide composite-curve according to claim 1 is characterized in that, is provided with heat-resisting packed layer between described metallic support bend pipe and wearing layer.
4. recrystallized silicon carbide composite-curve according to claim 3 is characterized in that, described heat-resisting packed layer is alumina silicate fiber felt or high aluminum fiber felt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220402610 CN202812654U (en) | 2012-08-15 | 2012-08-15 | Recrystal silicon carbide composite bend |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220402610 CN202812654U (en) | 2012-08-15 | 2012-08-15 | Recrystal silicon carbide composite bend |
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| CN202812654U true CN202812654U (en) | 2013-03-20 |
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| CN 201220402610 Expired - Fee Related CN202812654U (en) | 2012-08-15 | 2012-08-15 | Recrystal silicon carbide composite bend |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939705A (en) * | 2014-05-14 | 2014-07-23 | 江苏恒新能源科技有限公司 | Wear-resistant cooling pipeline |
| CN105179877A (en) * | 2015-10-13 | 2015-12-23 | 苏州上春仪监测程控设备制造有限公司 | Pipeline with silicon carbide lining and forming technique of pipeline |
| CN105240649A (en) * | 2015-10-13 | 2016-01-13 | 苏州上春仪监测程控设备制造有限公司 | Anti-impact abrasion-resistant board and machining method thereof |
| CN105671548A (en) * | 2016-03-29 | 2016-06-15 | 湖南三一中阳机械有限公司 | Elbow and elbow manufacturing method |
-
2012
- 2012-08-15 CN CN 201220402610 patent/CN202812654U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939705A (en) * | 2014-05-14 | 2014-07-23 | 江苏恒新能源科技有限公司 | Wear-resistant cooling pipeline |
| CN103939705B (en) * | 2014-05-14 | 2016-07-13 | 江苏恒新能源科技有限公司 | A kind of wear-resisting cooling pipe |
| CN105179877A (en) * | 2015-10-13 | 2015-12-23 | 苏州上春仪监测程控设备制造有限公司 | Pipeline with silicon carbide lining and forming technique of pipeline |
| CN105240649A (en) * | 2015-10-13 | 2016-01-13 | 苏州上春仪监测程控设备制造有限公司 | Anti-impact abrasion-resistant board and machining method thereof |
| CN105671548A (en) * | 2016-03-29 | 2016-06-15 | 湖南三一中阳机械有限公司 | Elbow and elbow manufacturing method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20200815 |