CN1145447A - Internal combustion engine valve - Google Patents
Internal combustion engine valve Download PDFInfo
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- CN1145447A CN1145447A CN 95116918 CN95116918A CN1145447A CN 1145447 A CN1145447 A CN 1145447A CN 95116918 CN95116918 CN 95116918 CN 95116918 A CN95116918 A CN 95116918A CN 1145447 A CN1145447 A CN 1145447A
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Abstract
There is provided an internal combustion engine valve having a body, a head, and a contact surface disposed on a head surface to be adapted to periodically enter into gas-sealing engagement with a valve seat, said contact surface being formed in alloy deposit welded to said valve head, by a high density energy beam such as a plasma beam or a laser beam, on said head surface, a conbalt based composition of said alloy deposit, measured at said contact surface, consisting essentially of carbon: 2.2 to 2.6 weight percent, silicon: 1.1 to 1.3 weight percent, manganess: 2.6 to 3.1 weight percent, chromium: 28 to 31 weight percent, iron: 10 to 11 weight percent, tungsten: 13.5 to 15.5 weight percent, balancing cobalt and inevitable amount of impurities.
Description
The present invention relates to a kind of engine valve that is provided with hard-facing surface (hard facing surface), this hard-facing surface is a kind of gold alloy solder of special component to be received on the original outer surface of valve head and formed with high density energy bundle such as beam-plasma and laser beam etc.The hard-facing surface of the formed valve head of the present invention has shown good wear resistance, high oxidation resistance lead (PbO) corrosivity and high antioxidant, and cost is relatively low.
In the prior art, be to prepare the contact surface of engine valve by oxycetylene welding procedure or plasma powder torch welding procedure or laser powder welding procedure, to form a kind of wear-resisting application surface with the superalloy composition that is suitable for forming abrasion resistant coating such as cobalt base alloy, nickel-base alloy or ferrous alloy etc.
The hard-facing alloy that is generally used for the exhaust valve surface is stellite (Stelli-te alloy), and they are the cobalt-chromium clad can alloys that are generally used for bearing on the austenitic stainless steel gas door serious surface abrasion and corrosion, uncoated, comprise STL
#6 (referring to JIS (JIS); 1.2C-1.0Si-30Cr-4W-all the other are Co), STL
#32 (all the other are Co for 1.8C-1.0Si-22Ni-26Cr-12W-) have excellent high-temperature wear resistance, resistance to oxidation lead (PbO) corrosivity and oxidative stability at interior various stellites.But stellite is because the content height of its precious metal such as cobalt, nickel, tungsten etc., thereby is expensive material.Stellite is a kind of nonferrous alloy that contains 40～80% cobalts, 0～25% tungsten, 20～35% chromium and 0.75～2.5% carbon.
Preparing with cobalt base alloy under the situation of valve contact surface by the oxyacetylene welding connection, formed overlay makes the possibility of contact surface generation defective very big.
The surface that replaces the oxycetylene coating that one deck is hard to be welded on valve with laser beam is known, referring to U.S. Patent No. 4,117.302 and 4,300,474.
The uncensored Japanese patent application No.61-296979/1986 suggestion of having announced already when adopting laser beam, is mixed weight percentage in the degree of depth for the 0.1mm part and is less than 1.2% precursor alloy in the hard-facing alloy.The uncensored Japanese patent application No.62-57770 that has announced is further suggestion then, controls the dilution of precursor alloy to the coating alloy by the delivery volume of regulating plasma gas.Announced and uncensored Japanese patent application No.61-276774 proposes, utilize the high density energy for example laser beam be added with the astroloy that weight percentage is the composition of 3.0% to 8.0% steel in the surface coverage of valve.
U.S. Patent No. 4,122,817 have disclosed a kind of engine valve with the contact surface that is formed by alloy, this alloy shows wear resistance, resistance to oxidation lead (PbO) corrosivity and oxidative stability, it contains the manganese of chromium, 0～3.0% (weight percentage) of nickel, 20～26% (weight percentage) of silicon, 8～13% (weight percentage) of molybdenum, 0.1～1.0% (weight percentage) of the carbon, 4.0～6.0% (weight percentage) of 1.4～2.0% (weight percentages), and remaining part is a cobalt.
As covering the lip-deep material of engine valve, it comprises: the carbon of 1.0-2.5% (weight percentage) a kind of ferrous alloy composition in disclosed uncensored Japanese patent application No.2-243042/1980 proposition; The silicon of 0.1-1.0% (weight percentage); The manganese of 3-12% (weight percentage); The nickel of 15-25% (weight percentage); The chromium of 20-30% (weight percentage); The molybdenum of 5-15% (weight percentage); The boron of 0.005-0.05% (weight percentage); The oxygen of the aluminium of 0.01-0.1% (weight percentage) and 0.01-0.05% (weight percentage), all the other are iron and impurity.In this alloy composite, add the corrosion resistance that the relative not high manganese of price will provide desirable level, simultaneously, adding boron will be guaranteed the flowability under the high temperature, add the uniformity that aluminium will form alloy microstructure.
Just as will be described, the valve overlay that forms with cobalt base alloy according to the present invention is better than the overlay performance that forms with stellite.
Compare with stellite, the present invention has realized saving the high-caliber performance of acquisition under the condition of cost significantly, and this is a significant achievement.
One of purpose of the present invention provides the valve overlay that forms with extraordinary cobalt base alloy composition of the present invention, is used for comprising superalloy or such as forming the hard-facing surface on the valve head surface of 751 alraies super heat-resisting nickel-chromium alloys such as (Inconel 751) by being welded on.
Another object of the present invention provides a kind of utilization such as high density energy bundles such as beam-plasma and laser beam and weld a kind of special alloy composition forms the hard-facing surface on valve head method on the superficies of original parent heat resisting alloy.
Hard-facing surface formed according to the present invention has the performance more competitive than the stellite surface of prior art.
Method of the present invention can make resulting valve head hard-facing surface have very high homogenieity.
Another object of the present invention provides a kind of go up attached to the original surface of valve head securely and performance does not have the hard-facing surface of a bit deterioration.
From following narration, be appreciated that other purpose of the present invention.
The present invention is further detailed explanation below with reference to the accompanying drawing as this specification part, wherein:
Fig. 1 is performance (weight that causes as the oxidation increases) comparison diagram of valve hard-facing head surface and other prior art alloy surface manufactured according to the present invention.
Fig. 2 is the schematic representation that the result that weight reduces with prior art clad can alloy obtains that the hard-facing contact surface made of expression the present invention is caused by corrosion compares.
Fig. 3 is the schematic representation that the variation of hardness when probe temperature raises on expression the present invention hard-facing surface of making compared with the result who is obtained by prior art clad can alloy.
The invention provides a kind of engine valve, have a body portion, valve disc and One is formed on a lip-deep contact surface of valve disc that contains the nickel chromium triangle superalloy, In order to valve seating airtight joint periodically, described contact surface is to use such as beam-plasma Or the high density energy bundle such as laser beam is welded on a kind of cobalt-base alloys the parent on valve disc surface On the alloy and form.
Weld strength between precursor alloy surface and the covering surfaces of burn-oning should be passed through parent Alloying component maintains sufficiently high level to the suitable diffusion of soldered covering surfaces. But Be, soldered tectal composition will be by the dilution of the composition of precursor alloy, and the result is soldered Cover layer in composition will change so that the possibility that has performance to reduce. Therefore, welding Should control the tectal dilution of welding the precursor alloy composition in the process, to protect The card weld strength maintains certain level does not make the cover layer performance reduce.
Use the bundle such as the high density energy such as beam-plasma or laser beam can be with the precursor alloy composition Be controlled at certain level with formed tectal dilution. In welding process, dilution Degree must be controlled at 10-20%. When dilution factor less than 10% the time, weld strength is inadequate, institute Internal flaw in the cover layer that forms can cause the danger of " no adhewsive action ". Work as dilution When degree surpassed 20%, tectal performance can descend greatly, or is subjected to the infringement of high dilution.
The bundle such as the high density energy such as beam-plasma or laser beam is used to a kind of special alloy Material is welded on the surface of valve disc in order to form the hard-facing surface, in this hard weldering In the coating surface, the high-energy of beam-plasma etc. the composition of precursor alloy is disperseed fully or Be admixed in the soldered cover layer. The cover layer that obtains like this will be homogeneous, thereby energy The precursor alloy surface there is enough adhesive force.
A kind of engine valve, have a body portion, valve disc and one be formed on for periodically with the lip-deep contact surface of the valve disc of valve seating airtight joint, this contact surface is to be formed on the described valve disc surface with the form that is welded to the alloy clad on the valve disc with a kind of high-energy beam such as beam-plasma or laser beam, and wherein the cobalt-based composition of alloy clad basic composition is:
Carbon: 2.2-2.6% percentage by weight
Silicon: 1.1-1.3% percentage by weight
Manganese: 2.6-3.1% percentage by weight
Nickel :≤1.5% percentage by weight
Chromium: 28-31% weight percentage
Iron: 10-11% weight percentage
Tungsten: 13.5-15.5% weight percentage
All the other are cobalt and unavoidable impurities.
In the welding fabrication process, cobalt base alloy enters valve head surface and the dilution that produces is controlled in 25-35% (weight percentage), so that improve the wear resistance of contact surface.The heat-resisting nickel-chromium alloy of parent can be 751 alraies (Inconel 751).
The invention is characterized in and to form the hard-facing contact surface of valve head by using high density energy bundle such as beam-plasma and laser beam etc., this production process can realize by a kind of special alloy composition is welded on the original surface of valve head, and consider following each point.
1, to select the composition and the composition thereof that are used to be welded to the original lip-deep coating alloy composite of valve head, so that can regulate to the alloy of welding and the dilution of precursor alloy.
2, by means of in the process of welding at the coating of welding and the agitation between the original surface, resulting face of weld should be a homogeneous, and resistance to heat is reduced.
Superalloy, particularly the superalloy of being made by nickel-chromium (Ni-Cr) superalloy has been used as the material of engine valve head original surface.Alloy composite of the present invention covers on this nickel-chromium alloy surface (precursor alloy), to form a cover coat that mixes mutually with highly corrosion resistant.
Being used for valve blank of the present invention can be made by various common alloys.
Equally, in the alloy or the composition of the composition in other main source of original surface alloy composite and ratio can in suitably wide scope, change.
Extraordinary composition alloy of the present invention is soldered or be coated on the original outer surface of the valve head that contains nickel-chromium series superalloy.This nickel-chromium series superalloy can comprise nichrome, 751 alraies (Inconel 751) preferably, in addition, monel metal (Monel metal alloy) and its sharp alloy of lotus (Hateroy alloy) also can be used as original outer surface.
751 alraies (Inconel 751) composed as follows:
Table 1 metal C Si Mn Ni Cr Al TiNb, Ta Fe weight percentage 0.05 0.2 0.2 71.0 16.0 1.2 2.5 1.0 8.0
The alloy composite that the most important thing is to be configured in according to the present invention especially the welding alloy on the valve head of being made by 751 alraies (precursor alloy) or be used to form the hard-facing contact surface of engine valve on the surface of valve head comprises the following compositions of following ratio:
The cobalt-based composition of described alloy clad mainly comprises:
Carbon: 2.2-2.6% weight percentage
Silicon: 1.1-1.3% weight percentage
Manganese: 2.6-3.1% weight percentage
Nickel: no more than 1.5% weight percentage
Chromium: 28-31% weight percentage
Iron: 10-11% weight percentage
Tungsten: 13.5-15.5% weight percentage
All the other are cobalt and unavoidable impurities.
The present invention's restriction is used for the reasons are as follows near each composition of the alloy of the contact surface of the outer surface formation engine valve of above-mentioned extraordinary heat resisting alloy composition:
The hardness and the wear resistance that add carbon and be in order to ensure formed contact surface reach desired level.When the hardness and the wear resistance of the content of the carbon surface of contact that welding forms during less than 2.2% (weight) can not reach desired level.When the content of carbon surpassed 2.6% (weight), the hardness of the contact surface that forms was too high, and toughness reduces.Thereby the optimum range of Kohlenstoffgehalt is 2.2%-2.6% (weight).
Adding silicon is in order to realize depickling and melt fluidity when welding.At silicone content during less than 1.1% (weight), deacidification effect deficiency, so that form the such defective of pinhole on the shaping contact surface, when silicone content surpasses 1.3% (weight), melt fluidity no longer improves, and anti-oxidant lead and lead sulfate (PbO+PbSO
4) the ability reduction.
Add nickel and be anti-oxidant lead (PbO) property and anti-oxidant lead and lead sulfate (PbO+PbSO in order to improve formed contact surface
4) property.When nickel content during less than 0.1% (weight), the corrosion resistance deficiency.When nickel content surpassed 1.3% (weight), the high price of nickel improved the cost of purchasing.
Chromatize is in order to help improving corrosion resistance, acid resistance particularly, when the content of chromium during less than 28% (weight), acid fastness can not reach desired enough levels, and when the content of chromium surpasses 31% (weight), the performance of heat shock resistance reduces, and causes in making the valve process after welding sequence, and forming such as the danger that the such defective of crackle occurs increases.
Adding iron is in order to help improving the thermal-shock resistance of formed contact surface.When iron content during less than 10.0% (weight), the thermal-shock resistance deficiency.When the content of iron surpasses 11% (weight), hardness at high temperature will reduce and wear resistance reduces.
Adding tungsten is in order to make the hardness of contact surface and hot strength be based upon desirable level by forming very tiny carbide particle.When the content of tungsten during less than 13.5% (weight), hot strength and hardness are all not enough.When the content of tungsten surpasses 15.5% (weight), the welding dissolubility and the ability to work of contact surface all will reduce.
Hard-facing contact surface of the present invention can utilize inert-gas arc welding to make by means of the known high density energy bundle that comprises beam-plasma and laser beam etc.Special alloy composition of the present invention will be the dilution of nickel-chromium superalloy by precursor alloy, so that change the composition on hard-facing surface but do not reduce the performance on valve head surface.
This welding procedure is convenient to automation, realizes the High-efficient Production of hard surface engine valve.
The prior art alloy that is used to be welded on the contact surface is a kind of and the suitable alloy composite of stellite (Stellite alloy), it is that a kind of cobalt-chromium-tungsten (Co-Cr-W) that can obtain from U.S. Hai Sisitelaite (Hayes Stellite) is alloy, have higher hardness, wear resistance and acid resistance, even and under red heat (red-hot) temperature, also do not reduce performance.
Stellite (Stellite alloy) has been used to the wear-resisting part of internal-combustion engine.The special alloy composition is welded on the original surface with the high density energy bundle according to the present invention and the composition and the stellite on the hard-facing surface of making are similar.So being appreciated that hard-facing surface alloy of the present invention has such as competitive performance such as wear-resisting and anti-oxidant.
Those of ordinary skill in the art will be understood that according to the formed hard-facing contact surface of the present invention to have desirable metallurgically ratio by means of the interaction of valve blank platform gold, welding wire (Weld wire) metallurgy and welding condition.
Therefore, in welding process, increase the energy supplied with and will increase ingredient in the former valve head to the influence aspect the metallurgy of weld metal by dilution.Conversely, reduce the energy of being supplied with in the welding process and can reduce the influence that valve head produces, and may have to the composition of other main sources of welding wire or weld metal is done compensation adjustment, have the desirable contact surface of forming so that form.
The hard-facing surface that forms according to the present invention can further specify according to comparative example.
Comparative example
By using such as high density energy bundles such as beam-plasma and laser beams, the extraordinary composition that is used to weld of the present invention is applied on the former outer surface of being made as 751 alraies by nickel-chromium superalloy, forms an outer surface with high wear resistance together so that be melted in.The last composition of valve head welding outer surface can be estimated as follows:
The content of the composition in the formed surface is approximately equal to:
(1-dilution/100) * (content of extraordinary composition)+
Dilution/100 * (content of original surface alloy)
Use such as high density energy bundles such as beam-plasma or laser beams stellite F (Stellite F) (to call " STL F " in the following text) sintered alloy is welded on the engine air door exterior surface that contains austenite series (Austenite series) SUH 36, so that form a cover surface that constitutes with 15%SUH36 dilution stellite F (Stellite F).
The composition of formed face of weld is estimated as shown in table 2.
Table 2 provides the composition (the 2nd row) of SUH36, and SUH36 is diluted to 15% (the 3rd row), and the composition of stellite F (the 4th row), stellite F are diluted to the composition (the 6th row) of 85% (the 5th row) and the last welding covering surfaces that forms.
Therefore, the combination of SUH36 (precursor alloy) and stellite F (being applicable to the composition that forms the hard-facing contact surface) has shown the performance of enough competitive ability, thereby in view of its final composition, thereby in solid line, can be used.
Table 2 composition surface alloy cobalt base alloy institute shape group
SUH SUH36 * Stellite Stellite * compound (* 1+*2)
0.15
* 10.85
* 2C 0.5 0.075 1.9 1.615 1.69Si 0.2 0.030 1.0 0.850 0.88Mn 9.0 1.350 0.4 0.723 2.073Ni 4.0 0.600 22.0 18.700 19.300Cr 21.0 3.150 26.0 22.100 25.250W-12.0 10.200 10.200Fe (65.3) 9.795 9.795Co-all the other all the other
The composition of the surface alloy that the welding that produces according to the present invention forms is shown in table 2 the 6th row.Formed surface alloy is tested Vickers hardness (with 5 kilograms of loads) respectively.They are by exposed to weather, under 1000 ℃ temperature, carry out 100 hours oxidation test, measure the weight that they increase because of oxidation, leftmost Nogata post is stellite F among Fig. 1, Nogata post in the middle of among Fig. 1 be among the stellite F fusion composition alloy of 15%SUH36, the composition (mixed 30% 751 alraies) of rightmost Nogata post for forming among Fig. 1 according to the present invention.
Above-mentioned three kinds of surface alloys anti-oxidant hydrogen (PbO) property and anti-oxidant lead and lead sulfate (PbO+PbS0 have been carried out
4) measurement of property.The sample of above-mentioned each surface alloy is being exposed 1 hour under 920 ℃ the temperature, adding lead sulfate (PbO+PbSO at lead oxide under 900 ℃ temperature respectively in lead oxide (PbO)
4) in expose one hour and test, sample is of a size of diameter 5mm, length 20mm.Test result as shown in Figure 2.
The Vickers hardness of above-mentioned three kinds of surface alloys is measured under the high temperature of room temperature and 800 ℃.The result as shown in Figure 3.Fig. 3 shows that Vickers hardness descends when probe temperature raises.
Following Example is represented can further specify the present invention by it, but this should be interpreted as limitation of the invention according to the formation of valve coverage rate alloy of the present invention.
The valve that head diameter is 23.5mm has a head surface that is formed by 751 alraies (Inconel 751).Cobalt-based hard-facing alloy with composition of the present invention as shown in table 3 is welded on 751 alraies (Inconel 751) surface by plasma welding (Plasma-Welding) and forms the hard-facing contact surface.According to the present invention, precursor alloy 751 will be diluted by cobalt base alloy.
According to the present invention, the precursor alloy of valve head surface in formed hard-facing surface diluted degree in the 25-35% weight percentage ranges.
So the last composition on hard-facing surface is as shown in table 3.
Formed dilution is the 6th and the 8th row that the last composition on 25% and 35% surface estimates to be shown in table 3.The original composition of welding alloy of the present invention is shown in the 5th and the 7th row of table 3.So, can see that it is 15% stellite F (Stellite F) that last composition seems to be equivalent to the dilution shown in the table 2.
Table 3 (weight percentage) composition original surface is formed the coating alloy
Inconel 751 dilutions 25% dilution 35% forms C 0.05 0.013 0.018 2.236Si 0.2 0.050 0.070 1.111Mn 0.2 0.050 0.070 2.697Ni 71.0 17.750 24.850 1.550Cr 16.0 4.000 5.600 28.333Al 1.2 0.300 0.420Ti 2.5 0.625 0.875Nb.Ta 1.0 0.250 0.350Fe 8.0 2.000 2.800 10.393W 13.600Co
Table 3 (weight percentage) (continuing) composition is made back coating alloy and is made the last group in back
Dilution 75% forms 65% one-tenth scope C 1.690 2.572 1.690 2.2-2.6Si 0.883 1.246 0.880 1.1-1.3Mn 2.073 3.082 2.073 2.6-3.1Ni 18.913 24.850≤1.5Cr 25.250 30.231 25.250 28.0-31.0Al 0.300 0.420Ti 0.625 0.875Nb.Ta 0.250 0.350Fe 9.795 10.762 9.795 10.0-11.0W 10.200 15.692 10.200 13.5-15.5Co of dilution all the other all the other
Can clearly be seen that to have according to the valve on the formed last hard-facing surface of the present invention suitable fully in stellite F (Stellite F) cover surface with prior art aspect wear resistance and the oxidative stability from these test results.At weld period, the alloy that is welded on the original surface can be diluted by this surperficial precursor alloy, and simultaneously, the original surface alloy also can dilute by soldered alloy, and the combination force that the result is welded between surface and the original surface increases, and both can both guarantee to stablize.Moreover formed alloy composite is lighter than the cover surface of prior art, and weight difference is 10% to 20%.Therefore can see that high density energy bundle Welder artistic skill provides a competitive good overburden surface for the valve head.
In the past, the hard-facing contact surface of engine valve still according to the present invention, can obtain same welded structure with the preparation of plasma-arc powder weld process with other inert-gas arc welding connection such as laser powder welding process.
Be soldered to the lip-deep alloy of valve head and in welding process, can become homogeneous, so that this alloy and surface alloy are mixed together equably.The formed hard-facing of the present invention surface has the coating of even dilution and has high adhesion force with the valve head surface.
Can be used to the welding procedure of the hard-facing contact surface of preparation engine valve in inert gas shielding atmosphere such as high density energy bundles such as plasma or laser beams, so that obtain to make the competitive hard-facing of the performance surface of internal-combustion engine.
In addition, can also make formed contact surface have higher hardness and corrosion resistance according to the present invention.
Claims (4)
1, a kind of engine valve, has a body portion, a head and a contact surface that is formed on the head surface that contains nickel-chromium superalloy, this contact surface is used for periodically and airtight a combination of valve seat, it is characterized in that, described contact surface is made of a kind of super heat-resisting cobalt base alloy, and it utilizes and is formed on the described head surface such as high density energy bundles such as beam-plasma or laser beams.
2, a kind of engine valve, has a body portion, head and one be formed on be used for periodically with an airtight head surface that combines of valve seat on contact surface, described contact surface utilizes and a kind ofly is formed on the described head surface with the form that is welded to the alloy clad on the described valve head such as high density energy bundles such as beam-plasma or laser beams, the result that described contact surface place is measured shows that the cobalt-based composition of described alloy clad mainly comprises:
Carbon: 2.2-2.6% weight percentage
Silicon: 1.1-1.3% weight percentage
Manganese: 2.6-3.1% weight percentage
Nickel :≤1.5% weight percentage
Chromium: 28-31% weight percentage
Iron 10-11% weight percentage
Tungsten 13.5-15.5% weight percentage
All the other are cobalt and unavoidable impurities.
3, engine valve according to claim 1 and 2, wherein, the cobalt base alloy that is diluted to during welding forming in the head surface is controlled in the 25-35% weight percentage, so that improve the wear resistance of contact surface.
4, according to each described engine valve of claim 1 to 3, wherein, described super heat-resisting nickel-chromium alloy is Inconel 751.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95116918A CN1066798C (en) | 1995-08-26 | 1995-08-26 | Internal combustion engine valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95116918A CN1066798C (en) | 1995-08-26 | 1995-08-26 | Internal combustion engine valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1145447A true CN1145447A (en) | 1997-03-19 |
| CN1066798C CN1066798C (en) | 2001-06-06 |
Family
ID=5081059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95116918A Expired - Fee Related CN1066798C (en) | 1995-08-26 | 1995-08-26 | Internal combustion engine valve |
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| Country | Link |
|---|---|
| CN (1) | CN1066798C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109179C (en) * | 1998-10-08 | 2003-05-21 | 富士乌兹克斯株式会社 | Mushroom like valve member made of aluminium or aluminium alloy, and making method thereof |
| CN107335940A (en) * | 2017-08-26 | 2017-11-10 | 芜湖鼎瀚再制造技术有限公司 | Valve surfacing cobalt-chromium-tungsten alloy powder and its welding procedure |
| CN107553000A (en) * | 2017-08-26 | 2018-01-09 | 芜湖鼎瀚再制造技术有限公司 | A kind of bearing surfacing cobalt-chromium-tungsten alloy powder and its welding procedure |
| CN111946417A (en) * | 2019-05-17 | 2020-11-17 | 马勒国际有限公司 | Gas exchange valve for an internal combustion engine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4787736A (en) * | 1987-06-15 | 1988-11-29 | Toyota Jidosha Kabushiki Kaisha | Laser clad valve for internal combustion engine |
| DE59206839D1 (en) * | 1991-07-04 | 1996-09-05 | New Sulzer Diesel Ag | Exhaust valve of a diesel engine and method of manufacturing the valve |
-
1995
- 1995-08-26 CN CN95116918A patent/CN1066798C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109179C (en) * | 1998-10-08 | 2003-05-21 | 富士乌兹克斯株式会社 | Mushroom like valve member made of aluminium or aluminium alloy, and making method thereof |
| CN107335940A (en) * | 2017-08-26 | 2017-11-10 | 芜湖鼎瀚再制造技术有限公司 | Valve surfacing cobalt-chromium-tungsten alloy powder and its welding procedure |
| CN107553000A (en) * | 2017-08-26 | 2018-01-09 | 芜湖鼎瀚再制造技术有限公司 | A kind of bearing surfacing cobalt-chromium-tungsten alloy powder and its welding procedure |
| CN111946417A (en) * | 2019-05-17 | 2020-11-17 | 马勒国际有限公司 | Gas exchange valve for an internal combustion engine |
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| Publication number | Publication date |
|---|---|
| CN1066798C (en) | 2001-06-06 |
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