CN102979910A - Silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing and method for producing silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing - Google Patents
Silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing and method for producing silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing Download PDFInfo
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- CN102979910A CN102979910A CN2012105210011A CN201210521001A CN102979910A CN 102979910 A CN102979910 A CN 102979910A CN 2012105210011 A CN2012105210011 A CN 2012105210011A CN 201210521001 A CN201210521001 A CN 201210521001A CN 102979910 A CN102979910 A CN 102979910A
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Abstract
The invention relates to a silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing and a method for producing the silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing. The friction pair for brittle fracture-resistant mechanical sealing is produced through adopting a hot pressing sintering method to treat ironnickel silicon, carbide powder with the granularity of no more than 1 mum and an appropriate addition agent. The method for producing the friction pair is that metal, the silicon carbide powder which is mixed uniformly according to the specified rate and the addition agent are put into a graphite die and are pressurized (20-50MPa) in a hot pressing furnace of 2000-2100 DEG C to produce the friction pair. The material which is produced through adopting the method can be used for corrosion-resistant mechanical sealing friction pairs.
Description
Technical field
The present invention relates to a kind of anti-embrittlement major diameter mechanical seal silicon carbide friction pair and manufacture method thereof.Particularly, adopt this material of described method manufacturing to can be used for corrosion resistant major diameter mechanical sealing friction pairs.
Background technique
The hardness of silicon carbide is near diamond and have outstanding wear resistance.Silicon carbide is one of most widely used material in mechanical seal, silicon carbide is except at high temperature dissolving highly basic and strong oxidizing gas, in the caustic alkali that concentration sulfuric acid and boiling point approach entirely, also can stably use, particularly in very large temperature range, keep corrosion resistance and wear resistance.But the friction pair made from carbofrax material but has a fatal weakness, and that is that mechanical strength is very low with regard to it, and is very fragile, very easily embrittlement and cracked under inhomogeneous pressurized condition.The particularly easier generation embrittlement of mechanical seal graphite stationary ring of those major diameters (more than the friction pair external diameter 200mm).The MANUFACTURER of a lot of mechanical seals has identical personal cognition with the user, that is: the mechanical sealing friction pairs of carbofrax material manufacturing is in the transportation transport process, very easily in cargo handling process, be subjected to external force to cause crackle, embrittlement or cracked, cause into waste product and can not use; Also have MANUFACTURER or user to install in the mechanical seal process also and can cause the cracked waste product that forms owing to undue force a little at assembling goods, cause thus waste and the leeway of finished product.Always very headache to this in the industry, and more effectively solution is not proposed so far.
The present invention proposes a kind of anti-embrittlement major diameter mechanical seal silicon carbide friction pair and manufacture method thereof.The mechanical seal of described anti-embrittlement major diameter with the silicon carbide friction pair by adopting hot pressing sintering method to make by iron-nickel alloy, granularity≤carborundum powder of 1 μ m and suitable additive.The linear expansion coeffcient of described iron-nickel alloy is: 0.5 * 10
-6, than regulation and the rotating ring of standard-required and the linear expansion coeffcient 4.5 * 10 of stationary ring
-6Much lower, satisfy usage requirement fully.Its manufacturing process is that carborundum powder that iron-nickel alloy metal ring or tinsel, in accordance with regulations ratio are mixed and additive are packed in the black lead mould, and (30-50Mpa) make in pressurization in 2000-2100 ℃ hot pressing furnace.Adopt this material of described method manufacturing to can be used for corrosion resistant mechanical sealing friction pairs.
The mechanical seal silicon carbide friction pair made from described method, all advantages and the performance that have not only kept the silicon carbide friction pair material, what is more important, owing in manufacture process, ring-type or sheet or strip iron-nickel alloy are placed the central position of carborundum powder, effectively strengthen the mechanical strength of silicon carbide friction pair, fundamentally solved major diameter friction pair that carbofrax material in the past makes very easily embrittlement and cracked problem.
Summary of the invention
The present invention for achieving the above object, be achieved through the following technical solutions: a kind of mechanical seal of anti-embrittlement silicon carbide friction pair and manufacture method thereof is characterized in that: the mechanical seal of described anti-embrittlement adopts hot pressing sintering method to make with the silicon carbide friction pair by iron-nickel alloy, granularity≤carborundum powder of 1 μ m and suitable additive.Its manufacturing process is that carborundum powder that iron-nickel alloy metal ring or tinsel, in accordance with regulations ratio are mixed and additive are packed in the black lead mould, and (30-50Mpa) make in pressurization in 2000-2100 ℃ hot pressing furnace.
This shows, in technique scheme of the present invention, in manufacture process, ring-type or sheet or strip iron-nickel alloy placed the granularity that the central position of carborundum powder, the ratio in accordance with regulations mix≤carborundum powder of 1 μ m and suitable additive, the employing hot pressing sintering method is made, effectively strengthen the mechanical strength of silicon carbide friction pair, fundamentally solved major diameter friction pair that carbofrax material in the past makes very easily embrittlement and cracked problem.
Description of drawings
Aspect above-mentioned and/or that add of the present invention and advantage are from obviously and easily understanding becoming embodiment's the description below in conjunction with accompanying drawing, and accompanying drawing is the schematic representation that the silicon carbide friction pair is used in the anti-embrittlement major diameter mechanical seal of one embodiment of the present of invention.Among the figure: 1 in the accompanying drawing: the silicon carbide powder that ratio in accordance with regulations mixes and additive; In the accompanying drawing 2: ring-type or sheet or strip iron-nickel alloy.
Embodiment
The below describes embodiments of the invention in detail, and described embodiment's example is shown in the drawings.Be exemplary below by the embodiment who is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.In the present invention, a kind of anti-embrittlement major diameter mechanical seal silicon carbide friction pair and manufacture method thereof.The mechanical seal of described anti-embrittlement is comprised of silicon carbide powder and the additive that ring-type or sheet or strip iron-nickel alloy, in accordance with regulations ratio mix with the silicon carbide friction pair, that is: the silicon carbide powder and the additive (1 in the accompanying drawing) that mix of ring-type or sheet or strip iron-nickel alloy (2 in the accompanying drawing), ratio in accordance with regulations.
Embodiment one: manufacturing external diameter 500mm, internal diameter 200mm, thickness are the major diameter mechanical seal graphite stationary ring technological process of the anti-embrittlement of 30 mm.Adopt first the machine cut processing mode side of producing ring-type iron-nickel alloy ring, its Dimensions is: external diameter 400mm, internal diameter 300mm, thickness are 10 mm, and is for subsequent use; It is an amount of to get additive silicon carbide powder an amount of, that get granularity≤1 μ m, and both are mixed be placed on black lead mould, simultaneously, square ring-type iron-nickel alloy ring for subsequent use is also placed the silicon carbide powder that mixes, at this moment, in operation, must note the iron-nickel alloy ring is placed the silicon carbide powder central position that mixes; Then, 2000---and pressurization in 2100 ℃ the hot pressing furnace (30---50Mpa) make.Further Shape correction processing after taking out; Normal temperature leaves standstill after 8 hours and carries out grinding to finished product again.
The above is preferred embodiment of the present invention only, is not that the present invention is done any pro forma restriction.The those of ordinary skill of all industry, but all shown in the by specification accompanying drawing and the above, implement swimmingly the present invention.But all those skilled in the art are not breaking away from the technical solution of the present invention scope, and a little change of making when utilizing the disclosed above technology contents, the equivalent variations of modifying and developing are equivalent embodiment of the present invention; Simultaneously, the change of any equivalent variations that all foundations essence technology of the present invention is done above embodiment, modify with differentiation etc., all still belong to the scope of technological scheme of the present invention.
Claims (2)
1. an anti-embrittlement major diameter mechanical seal is characterized in that with silicon carbide friction pair and manufacture method thereof: the mechanical seal of described anti-embrittlement with the silicon carbide friction pair by being made by iron-nickel alloy, granularity≤carborundum powder of 1 μ m and suitable additive employing hot pressing sintering method.
2. the metal in the silicon carbide according to claim 1 is the extremely low iron-nickel alloy of expansion coefficient.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105210011A CN102979910A (en) | 2012-12-07 | 2012-12-07 | Silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing and method for producing silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105210011A CN102979910A (en) | 2012-12-07 | 2012-12-07 | Silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing and method for producing silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102979910A true CN102979910A (en) | 2013-03-20 |
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| CN2012105210011A Pending CN102979910A (en) | 2012-12-07 | 2012-12-07 | Silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing and method for producing silicon carbide friction pair for brittle fracture-resistant large-diameter mechanical sealing |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2556070A1 (en) * | 1983-12-01 | 1985-06-07 | Ceraver | Method for manufacturing a mechanical sealing gasket for a rotary machine |
| JPS6215280A (en) * | 1985-07-12 | 1987-01-23 | Nippon John Kureen Kk | Lip sealing material |
| US5370405A (en) * | 1991-08-30 | 1994-12-06 | Nippon Pillar Packing Co., Ltd. | Packing |
| CN1667303A (en) * | 2004-03-08 | 2005-09-14 | 东台市华阳玻纤有限责任公司 | Carbon fiber filling sealed and woven base material and its manufacturing method |
| JP2007314641A (en) * | 2006-05-24 | 2007-12-06 | Du Pont Mitsui Fluorochem Co Ltd | Fluororesin composition |
| CN102022544A (en) * | 2011-01-06 | 2011-04-20 | 武汉理工大学 | Mechanical seal friction pair material and preparation method thereof |
-
2012
- 2012-12-07 CN CN2012105210011A patent/CN102979910A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2556070A1 (en) * | 1983-12-01 | 1985-06-07 | Ceraver | Method for manufacturing a mechanical sealing gasket for a rotary machine |
| JPS6215280A (en) * | 1985-07-12 | 1987-01-23 | Nippon John Kureen Kk | Lip sealing material |
| US5370405A (en) * | 1991-08-30 | 1994-12-06 | Nippon Pillar Packing Co., Ltd. | Packing |
| CN1667303A (en) * | 2004-03-08 | 2005-09-14 | 东台市华阳玻纤有限责任公司 | Carbon fiber filling sealed and woven base material and its manufacturing method |
| JP2007314641A (en) * | 2006-05-24 | 2007-12-06 | Du Pont Mitsui Fluorochem Co Ltd | Fluororesin composition |
| CN102022544A (en) * | 2011-01-06 | 2011-04-20 | 武汉理工大学 | Mechanical seal friction pair material and preparation method thereof |
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Application publication date: 20130320 |