CN101857440B - Sealing strip and manufacturing method and application thereof - Google Patents
Sealing strip and manufacturing method and application thereof Download PDFInfo
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- CN101857440B CN101857440B CN 201010185686 CN201010185686A CN101857440B CN 101857440 B CN101857440 B CN 101857440B CN 201010185686 CN201010185686 CN 201010185686 CN 201010185686 A CN201010185686 A CN 201010185686A CN 101857440 B CN101857440 B CN 101857440B
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- silicon nitride
- silicon carbide
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Abstract
The invention discloses a sealing strip, overcoming the defect of low breaking strength of the existing sealing strip. The sealing strip is prepared from 41.5-50wt% of silicon carbide and 50-58.5wt% of silicon nitride. The sealing strip is processed and manufactured by taking SiC and SiN ceramic materials as raw materials through proper technological conditions, has properties conforming to use requirements of a triangle rotor engine, has high hardness and breaking strength, and improves the sealing reliability and service life of the sealing strip. At the same time, the invention also provides a manufacture method and an application of the sealing strip.
Description
Technical field
The present invention relates to a kind of tightness system, particularly relate to a kind of sealed strip for rotary polygonal piston engine.
Background technology
The sealed strip that uses in the existing rotary polygonal piston engine is easy to wear, and causes the lost of life of sealed strip, therefore also causes the shortening in rotary polygonal piston engine life-span.This is because the material of employed sealed strip is a kind of alloy cast iron material in the existing rotary polygonal piston engine, though this alloy cast iron material has good folding strength, high thermal resistance and workability.Yet because the hardness of this alloy cast iron material is lower, easy to wear, sealing reliability and life-span that sealed strip uses have been affected.
Though that existing stupalith has is lightweight, heat-proof quality good, thermal expansivity is little, corrosion-resistant and resistant to elevated temperatures characteristic, has been widely used in Industrial products.But because the folding strength of materials is lower, be very limited when causing it to use particularly as load parts and moving parts use.
Summary of the invention
The purpose of this invention is to provide a kind of sealed strip and overcome the low deficiency of existing sealed strip folding strength.
The present invention is achieved through the following technical solutions:
A kind of sealed strip is to be made by the silicon nitride of the silicon carbide of 41.5wt%-50wt% and 50wt%-58.5wt%.
According to further improvement of the present invention, the sealing bar is the silicon carbide by 45.5wt%, and the silicon nitride of 54.5wt% is made.
Simultaneously, the present invention also provides the as above making method of sealed strip, comprises the steps:
A) respectively silicon carbide and silicon nitride ball are milled to micron powder, sieve, take by weighing in proportion silicon carbide and alpha-silicon nitride powders; B) load weighted silicon carbide and alpha-silicon nitride powders are mixed rear press-in die, carry out preheating, be 1-2 hour warm up time; C) mixture after the extruding preheating, extrusion time is 0.5-1 hour; D) will push good mixture cooling, depanning obtains the sample base; E) described sample base is carried out sintering, sintering time is 1-2 hour, and sintering time leaves standstill cooling after finishing, and depanning obtains blank; F) blank is carried out sampling Detection, detect and qualifiedly rear described blank is carried out precision processing, namely get described sealed strip.
According to further improvement of the present invention, above-mentioned steps a) in silicon carbide and silicon nitride ball be milled to the powder that particle diameter is not more than 10 μ m.
According to further improvement of the present invention, above-mentioned steps b) preheating temperature maintains 950-1050 ℃ in.
According to further improvement of the present invention, above-mentioned steps c) squeeze pressure maintains 200-240Mpa in.
According to the further improvement that one's duty is bought that, above-mentioned steps e) in sintering temperature maintain 2050-2150 ℃.
Simultaneously, provide the application of above-mentioned sealed strip in rotary polygonal piston engine.
The beneficial effect that the present invention produces is as follows: sealed strip of the present invention is take silicon carbide (SiC) and silicon nitride (SiN) stupalith as raw material, carry out processing and fabricating by suitable processing condition, prepared sealed strip has the performance that meets the rotary polygonal piston engine service requirements, have higher hardness and folding strength, improved sealing reliability and the life-span of sealed strip.
Embodiment
For the friction spoke in the engineering goods moving parts, abrasion loss is one of the key influence factor in its reliability and life-span, wherein volume density, hardness, thermal expansivity, folding strength and dimensional precision are to weigh the performance perameter of its abrasion loss, if can improve the abrasion loss that these parameters just can reasonably alleviate the friction spoke, and then the reliability of enhancing friction spoke, the life-span of prolongation friction spoke.
The inventor be intended to make a kind of for rotary polygonal piston engine sealed strip, because being subject to the performance of rotary polygonal piston engine limits, the Rockwell hardness HRA of requirement sealing bar 〉=100, folding strength 〉=700MPa, for this reason, the contriver is with silicon carbide (SiC) and silicon nitride (SiN) ceramic composite, by certain moulding process, again by high fine-processing technique, make the sealing member that can be applicable to high rotating speed surface of friction, the hardness of the seal and folding strength can both meet the requirements, and wear-resistant, compare metallic substance, greatly improved reliability and the life-span of sealing member.
In a kind of exemplary embodiment of the present invention, the sealing bar is to be made by the silicon nitride of the silicon carbide of 41.5wt%-50wt% and 50wt%-58.5wt%.
In a kind of preferred implementation of the present invention, the sealing bar is the silicon carbide by 45.5wt%, and the silicon nitride of 54.5wt% is made.
In a kind of exemplary embodiment of the present invention, the making method of sealing bar comprises the steps:
A) respectively silicon carbide and silicon nitride ball are milled to micron powder, sieve, take by weighing in proportion silicon carbide and alpha-silicon nitride powders; Silicon carbide and silicon nitride are less through the particle diameter of the powder that ball milling makes, its mixing more abundant, even.But be limited to the restriction of prior art level, can only ball milling to micron order, in the present invention, silicon carbide and silicon nitride preferred spheres are milled to the powder that particle diameter is not more than 10 μ m.
B) load weighted silicon carbide and alpha-silicon nitride powders are mixed rear press-in die, carry out preheating, be 1-2 hour warm up time; Wherein, preheating temperature preferably maintains 950-1050 ℃.The temperature of preheating is unsuitable too high, otherwise causes easily the damage of mould.
C) mixture behind the extruding sintering, extrusion time is 0.5-1 hour; Wherein, squeeze pressure preferably maintains 200-240Mpa.Do not use in the present invention in the prior art vacuum technique that often uses, but make prepared sealed strip have higher folding strength by squeeze pressure being maintained 200-240Mpa, this technique simple and to equipment require low.
D) will push good mixture cooling, depanning obtains the sample base;
E) described sample base is carried out sintering, sintering time is 1-2 hour, and sintering time leaves standstill cooling after finishing, and depanning obtains blank; Requirement for sintering temperature, the performance of the higher prepared material of temperature is better, yet the higher requirement to equipment of temperature is higher, and it is higher to consume energy, and sealed strip of the present invention is mainly used in rotary polygonal piston engine, according to the requirement of rotary polygonal piston engine, sintering temperature preferably maintains 2050-2150 ℃ in the present invention, under this temperature, the sealed strip various aspects of performance of made all meets the requirements, and this temperature is to realize the as above minimum temperature of effect.
F) blank is carried out sampling Detection, detect and qualifiedly rear described blank is carried out precision processing, namely get sealed strip of the present invention.
In a kind of embodiment of the present invention, sealed strip is applied in the rotary polygonal piston engine.
The present invention is described in detail below in conjunction with specific embodiment, test analysis and Datum Argument.
Embodiment 1-5
Take by weighing each raw material by the proportioning in the table 1, (concrete processing parameter is according to processing shown in the table 1) makes according to sealed strip of the present invention by the following method, and step comprises:
The raw material pre-treatment is respectively below ball milling powder process to the 10 μ m; Take by weighing each raw material and be mixed by proportioning; By workpiece requirement press-in die, the High Temperature Furnaces Heating Apparatus of packing into, High Temperature Furnaces Heating Apparatus heated to 950-1050 ℃ of heat-insulation preheating 1-2 hour after, the band temperature is come out of the stove; Mixture behind the sintering is rendered to extrusion equipment push, the pressure that extrusion equipment is set is 200-240MPa, pushes 0.5-1 hour, carries out naturally cooling after coming out of the stove, and depanning obtains the sample base; With unit clamp with the sample base High Temperature Furnaces Heating Apparatus of packing into for the second time; Heat to 2050-2150 ℃ and carry out sintering, after heat preservation sintering 1-2 hour, cool to 750-850 ℃ with the furnace, the rear naturally cooling of coming out of the stove, depanning namely obtains workpiece blank, carries out the sampling measurement performance by technical qualification, and qualified part are through obtaining finished product after the retrofit.
Table 1. embodiment 1-5 proportioning raw materials and processing parameter
Comparative Examples 1-4
Proportioning according to Comparative Examples 1-4 in the table 2 takes by weighing each raw material, makes (concrete processing parameter is according to processing shown in the table 2) according to the production method identical with embodiment 1-5.
Table 2. Comparative Examples 1-4 proportioning raw materials and processing parameter
Comparative Examples 5
The material of the sealed strip that uses in the prior art intermediate cam Wankel engine is a kind of alloy cast iron material, often use such as the CrMoCu alloy, the CrMoCu alloy is prepared into sealed strip according to the alloy treatment method.
Evidence
Tested object: to according to the testing of the prepared sealed strip of embodiment of the invention 1-5, Comparative Examples 1-5, test result is listed in the table 3.
Testing standard: according to HB5367.7-1986 carbon graphite sealing material density inspect method in the Aviation Industry of China standard; HB5367.2-1986 carbon graphite sealing material folding strength test method; HB5367.6-1986 carbon graphite sealing material Rockwell hardness (HR) test method; HB5367.9-1986 carbon graphite sealing material thermal expansivity test method.
Acceptance condition: according to the service requirements of rotary polygonal piston engine, it is 3.0-4.0g/cm that the performance need of sealed strip satisfies volume density
3, Rockwell hardness is HRA 〉=100, the coefficient of expansion (RT) scope is (2.0-2.4) * 10
-6/ K, folding strength 〉=700MPa.
The performance test data of table 3 batten
As shown in table 3, according to the sealed strip of Comparative Examples 1 with Comparative Examples 2 proportioning mades, it is the simple sealed strip that uses a kind of ceramic material, although the hardness of sealing bar is near the requirement of rotary polygonal piston engine, but because its folding strength is but excessively low, when in rotary polygonal piston engine, using, only can reach 500-600 hour work-ing life.
According to the prepared sealed strip of Comparative Examples 3 and Comparative Examples 4, its employed raw material is consistent with the present invention, but different from the present invention aspect sintering temperature and squeeze pressure, compare with Comparative Examples 1 or Comparative Examples 2, consequently the hardness of product and folding strength slightly increase, when using in rotary polygonal piston engine, slightly increase work-ing life, for about 600-650 hour.
The sealed strip that Comparative Examples 5 is prepared is sealed strip commonly used in the existing rotary polygonal piston engine, and sealing bar hardness is excessively low, easy to wear, causes the life-span can only reach 300 hours.
According to the made sealed strip of embodiment of the invention 1-5, the performances such as its volume density, Rockwell hardness, the coefficient of expansion (RT), folding strength all can satisfy the requirement of rotary polygonal piston engine, when using in rotary polygonal piston engine, work-ing life was above 1000 hours.Simultaneously by result in the table 3 as can be known, the performance of the sealed strip that embodiment 3 and embodiment 5 are prepared is better than the effect of embodiment 1,2,4 prepared sealed strips, when being used in rotary polygonal piston engine by embodiment 3 or embodiment 5 prepared sealed strips, work-ing life can be above 1100 hours.
In sum, sealed strip according to the present invention has improved hardness and the folding strength of sealed strip, has effectively improved sealing reliability, and can be extended to the work-ing life of sealed strip above 1000 hours, has prolonged simultaneously the work-ing life of rotary polygonal piston engine.
Use can realize that according to sealed strip of the present invention high reliability and the long lifetime requirement of rotary polygonal piston engine, sealing bar also can be widely used in other high rigidity, high temperature resistant and wear-resisting friction member product need to be arranged.
Embodiment herein only is used for exemplifying the explanation embodiments of the present invention, is not limited to the present invention.For a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a sealed strip is characterized in that, is to be made by the silicon carbide of 41.5wt%-50wt% and the silicon nitride of 50wt%-58.5wt%;
Described sealed strip is prepared from by following steps:
A) respectively silicon carbide and silicon nitride ball are milled to micron powder, sieve, take by weighing in proportion silicon carbide and alpha-silicon nitride powders;
B) load weighted silicon carbide and alpha-silicon nitride powders are mixed rear press-in die, carry out preheating, preheating temperature maintains 950-1050 ℃, and be 1-2 hour warm up time;
C) mixture after the extruding preheating, squeeze pressure maintains 200-240Mpa, and extrusion time is 0.5-1 hour;
D) will push good mixture cooling, depanning obtains the sample base;
E) described sample base is carried out sintering, sintering temperature maintains 2050-2150 ℃, and sintering time is 1-2 hour, and sintering time leaves standstill cooling after finishing, and depanning obtains blank;
F) blank is carried out sampling Detection, detect and qualifiedly rear described blank is carried out precision processing, namely get described sealed strip.
2. sealed strip according to claim 1 is characterized in that, is made by the silicon carbide of 45.5wt% and the silicon nitride of 54.5wt%.
3. the making method of a manufacturing such as claim 1 or 2 each described sealed strips,
It is characterized in that, comprise the steps:
A) respectively silicon carbide and silicon nitride ball are milled to micron powder, sieve, take by weighing in proportion silicon carbide and alpha-silicon nitride powders;
B) load weighted silicon carbide and alpha-silicon nitride powders are mixed rear press-in die, carry out preheating, preheating temperature maintains 950-1050 ℃, and be 1-2 hour warm up time;
C) mixture after the extruding preheating, squeeze pressure maintains 200-240Mpa, and extrusion time is 0.5-1 hour;
D) will push good mixture cooling, depanning obtains the sample base;
E) described sample base is carried out sintering, sintering temperature maintains 2050-2150 ℃, and sintering time is 1-2 hour, and sintering time leaves standstill cooling after finishing, and depanning obtains blank;
F) blank is carried out sampling Detection, detect and qualifiedly rear described blank is carried out precision processing, namely get described sealed strip.
4. method according to claim 3 is characterized in that, described step a) in silicon carbide and silicon nitride ball be milled to the powder that particle diameter is not more than 10 μ m.
5. the application of sealed strip as claimed in claim 1 in rotary polygonal piston engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010185686 CN101857440B (en) | 2010-05-28 | 2010-05-28 | Sealing strip and manufacturing method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010185686 CN101857440B (en) | 2010-05-28 | 2010-05-28 | Sealing strip and manufacturing method and application thereof |
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| CN101857440A CN101857440A (en) | 2010-10-13 |
| CN101857440B true CN101857440B (en) | 2013-03-20 |
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| CN 201010185686 Active CN101857440B (en) | 2010-05-28 | 2010-05-28 | Sealing strip and manufacturing method and application thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4560668A (en) * | 1981-10-23 | 1985-12-24 | Elektroschmelzwerk Kempten Gmbh | Substantially pore-free shaped articles of polycrystalline silicon carbide, and a process for their manufacture by isostatic hot-pressing |
| US4572902A (en) * | 1984-02-10 | 1986-02-25 | Kurosaki Refractories Co., Ltd. | Method for producing ceramic sintered body of a Si3 N4 -SiC system |
| CN101531519A (en) * | 2008-03-12 | 2009-09-16 | 李琎 | Composite high-temperature molybdenum disilicide-base material and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11310465A (en) * | 1998-02-27 | 1999-11-09 | Kyocera Corp | Ceramic sintered body and sealing material using the same |
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2010
- 2010-05-28 CN CN 201010185686 patent/CN101857440B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4560668A (en) * | 1981-10-23 | 1985-12-24 | Elektroschmelzwerk Kempten Gmbh | Substantially pore-free shaped articles of polycrystalline silicon carbide, and a process for their manufacture by isostatic hot-pressing |
| US4572902A (en) * | 1984-02-10 | 1986-02-25 | Kurosaki Refractories Co., Ltd. | Method for producing ceramic sintered body of a Si3 N4 -SiC system |
| CN101531519A (en) * | 2008-03-12 | 2009-09-16 | 李琎 | Composite high-temperature molybdenum disilicide-base material and preparation method thereof |
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| CN101857440A (en) | 2010-10-13 |
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Address after: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee after: China Hangfa South Industrial Co. Ltd. Address before: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee before: China Southern Airlines Industry (Group) Co., Ltd. |