CN1009840B - Pt-base alloy for spark plug - Google Patents
Pt-base alloy for spark plugInfo
- Publication number
- CN1009840B CN1009840B CN 88107237 CN88107237A CN1009840B CN 1009840 B CN1009840 B CN 1009840B CN 88107237 CN88107237 CN 88107237 CN 88107237 A CN88107237 A CN 88107237A CN 1009840 B CN1009840 B CN 1009840B
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- alloy
- base alloy
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Abstract
The present invention relates to platinum alloy for a sparking plug. The present invention is characterized in that the alloy contains10 to 30 wt% of Ir, at least one element selected from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y, and Pt as the rest, wherein the content of each element or the content of the sum of the elements is from 0.02 to 2.0 wt%. 0 to 20 wt% of Rh is added to the alloy on the basis of the composition, and thus, the high-temperature strength and the gas erosion resistant capability of the alloy are further enhanced. The alloy can be used as a glowing filament or a central discharge electrode of a sparking plug, and the working temperature is about 1100 DEG C.
Description
The present invention relates to red-hot silk of explosive motor sparking plug or discharge electrode platinum base alloy material.
When sparking plug for internal combustion engine is worked, no matter be the heating wire of incandescent ignition type, or the discharge electrode of spark ignition method, all to bear the etch of high temperature and corrodibility combustion gas.Present widely used material mainly is nickel-base alloy and platinum base alloy.Platinum base alloy is compared with nickel-base alloy, have consumption less, long advantage of life-span.At present widely used mainly is the platinum base alloy that contains Ir5～30Wt%, and typical alloy is the Pt that contains Ir10%
90Ir
25Alloy and the Pt that contains Ir25%
75Ir
25Alloy, these alloys are when working more than 1000 ℃, and grain growth is accelerated, and oxidational losses speed strengthens, and high-temperature fuel gas can carry out unusual etch along crystal boundary simultaneously, cracks, thereby causes the strength of materials to reduce significantly.The special public clear 61-30014 of Japanese Patent discloses a kind of sparking plug electrode materials, and it is a kind of improvement on PtIr25 alloy basis.Its composition is select in Ir15～25%, Ni2.1～5% and/or Mo, Rh, Ru, Co, Fe, Mn0.5～5% at least a, and surplus is Pt.The grain growth temperature of this kind alloy is higher than 1000 ℃.Though with PtIr25 alloy phase ratio, this kind alloy all makes moderate progress at aspects such as grain growth starting temperature, work-ing lifes, its improvement degree is not remarkable, and mainly as discharge electrode, if be used as the heating wire of red-hot formula, its life-span will shorten.
The objective of the invention is to overcome the deficiency of existing alloy material, provide that a kind of high temperature resistant, anti-exhaust gas corrosion ability is strong, the Pt-base alloy for spark plug of longer service life.
The objective of the invention is to strengthen and realize by in the Pt-Ir alloy, adding a small amount of rare earth or mixed rare-earth elements.These rare earth elements have intensive and purify and strengthening effect.They can generate complicated heat-resisting compound with the detrimental impurity in the alloy, and these compounds just condense metal melt begins to solidify before, in metal or be spherical distribution, or float on metallic surface slagging discharge.The removal of detrimental impurity can improve the over-all properties of alloy; And spherical particle distributes in the disperse of alloy crystal boundary and intracrystalline and can suppress the growth of crystal grain effectively, improves the grain growth starting temperature, reduces the erosion rate of crystal boundary, thereby improves the hot strength and the work-ing life of material.
Platinum base alloy of the present invention contains: Ir10～30Wt%, and at least a element of from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, selecting, and select the content of element or the content sum of more than one selection elements to be 0.02～2.0Wt% for every kind, surplus is Pt.In platinum base alloy of the present invention, also can on above-mentioned chemical ingredients basis, add Rh0～20Wt% again, all the other compositions are identical, with the hot strength and the corrosion resistance of further raising alloy.Preferential alloying constituent of recommending is: Ir10～20Wt%, Rh5～15Wt%, and at least a element of from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y, selecting, and select the content of element or the content sum of more than one selection elements to be 0.05～1.0Wt% for every kind, surplus is Pt.
In the present invention, the content that limits Ir is 10～30%, and the content of Rh is that 0～20% reason is that in this scope, the adding of Ir, Rh can improve the intensity of pure platinum really greatly, and significantly improves its high temperature resist chemical performance; But if Ir content surpasses 30%, or content (Ir+Rh) surpasses 50%, then the alloy poor processability.In addition and since the price of Rh than the Pt costliness many, the Rh too high levels will make material cost greatly increase.The content sum that limits the content of every kind of rare earth element or more than one rare earth elements is that 0.02～2.0% reason is, when rare earth or mixed rare-earth elements content less than 0.02% the time, can not prevent grain coarsening effectively and improve the resistance to corrosion of alloy.On the other hand, because the solid solubility of rare earth element in Pt, Ir, Rh is generally all very low, when the content of rare earth element in alloy surpasses 2%, more friable metal be can form and thing and oxide compound changed mutually, thereby cause alloy processing characteristics deterioration, the welding property variation, easy fracture under high-temperature fuel gas etch condition.
Compare with prior art, the present invention has following advantage:
1. grain growth temperature height generally all is higher than 1100 ℃, and alloy can be worked in 1000～1150 ℃.
2. anti-exhaust gas corrosion performance is better.
3. long service life.
The invention will be further described below by example.
Embodiment 1
According to the alloy compositions that is numbered No.1～No20 shown in the table 1, adopt high frequency furnace melting under the vacuum argon filling condition to obtain alloy cast ingot respectively.By forge hot with cold rollingly be processed into the thin slice that thickness is 0.5mm, metallographic sample is made on the polish etch surface, puts into high temperature metallographic microscope, heats up the temperature of directly observing crystal grain begin obviously to grow up continuously with 10 ℃/minute speed again.The result is as shown in table 1.As can be seen from Table 1, sample No.4,5 is because of poor processability, and practical value is little.Sample No.6～20 that the present invention includes, processing characteristics is good, and crystal grain begins the temperature of alligatoring all more than 1100 ℃, and the alloy grain alligatoring temperature of wherein adding heavy rare earth element is all more than 1150 ℃.
Embodiment 2
In view of the longevity test cycle of spark ignition electrode oversize, and experimental results show that for commaterial if it is long more to be used as the life-span of the red-hot silk of igniting, then it is corresponding also long more as the life-span of spark electrode, so in this embodiment, only enumerated the example of incandescent ignition type heating wire.
Adopt embodiment 1 described method melting to prepare the alloy cast ingot of listed each component of table 2, be processed into the silk material of diameter 0.25mm, make sparking plug with red-hot silk, put and be welded on the obturating plug by operations such as forge hot, cold rolling and cold-drawns.Experiment is 3.5 milliliters with cylinder volume, and engine is loaded on the model ship that navigates by water in water finishes on the fast ship, and rotating speed is 28000～30000 rev/mins.Used fuel oil composition is (Wt%): methyl alcohol 82, Viscotrol C 13, Nitromethane 99Min. 5.Every kind of alloy material is tested three times, and the mean value of getting each time life-span is mean lifetime.Because Ce and Gd are respectively the most cheap light rare earths and heavy rare earth elements at present, its feature has certain representativeness, and therefore, present embodiment has only been enumerated the situation as substitutional element with Ce and Gd.For other rare earth element, the situation of La, Pr, Nd, Sm is similar to Ce; The situation of Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y is similar to Gd.Test-results is as shown in table 2.By table 2 as seen, alloy in the composition range of the present invention all has more stable crystal state under high-temperature fuel gas etch condition, work-ing life is all longer, and wherein No.7,12,28 samples have the long especially life-span, compare with reference alloy No.2,3, advance is tangible.Simultaneously, these alloys all have and Pt
75Ir
25But processability that alloy is close and heat sealability all can actually use.
Table 1
Sample alloying constituent (Wt%) processing grain growth is initial
No. Pt Ir Rh displacement metallicity temperature (℃)
1 surplus---good 400～500
2 〃 25--good＞1000
3 〃 14 13-good＞1000
4 〃 30 20-poor＞1000
5 〃 35 15-poor＞1000
6 〃, 14 13 La0.2 very＞1100
7 〃 〃 〃 Ce0.2 〃 〃
8 〃 〃 〃 Pr0.2 〃 〃
9 〃 〃 〃 Nd0.2 〃 〃
10 〃 〃 〃 Sm0.2 〃 〃
11 〃 〃 〃 En0.2 〃 ＞1150
12 〃 〃 〃 Gd0.2 〃 ＞1150
13 〃 〃 〃 Tb0.2 〃 〃
14 〃 〃 〃 Dy0.2 〃 〃
15 〃 〃 〃 Ho0.2 〃 〃
16 〃 〃 〃 Er0.2 〃 〃
17 〃 〃 〃 Tm0.2 〃 〃
18 〃 〃 〃 Yb0.2 〃 〃
19 〃 〃 〃 Lu0.2 〃 〃
20 〃 〃 〃 Y0.2 〃 〃
Table 2
Sample alloying constituent (Wt%) mean lifetime
No. Pt Ir Rh displacement metal (hour)
2 surpluses 25--2.5
3 〃 14 13 - 3.0
7 〃 14 13 Ce0.2 ＞4.5
21 〃 〃 〃 Ce2.0 3.0
22 〃 〃 〃 Co0.5 3.5
23 〃 〃 〃 Ce0.1 4.0
24 〃 〃 〃 Ce0.05 3.5
25 〃 〃 〃 Ce0.02 3.0
26 〃 〃 〃 Gd2.0 3.0
27 〃 〃 〃 Gd0.5 4.0
12 〃 〃 〃 Gd0.2 ＞5.0
28 〃 〃 〃 Gd0.1 4.5
29 〃 〃 〃 Gd0.05 3.5
30 〃 〃 〃 Gd0.02 3.0
31 〃 25 - Ce0.2 3.5
32 〃 25 - Gd0.2 4.0
Claims (3)
1, Pt-base alloy for spark plug, it is characterized in that, at least a element that said platinum base alloy contains (weight %) Ir10～30% and selects from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, and select the content of element or the content sum of more than one selection elements to be 0.02～2% for every kind, surplus is Pt.
2, platinum base alloy as claimed in claim 1 is characterized in that also containing Rh0～20% in said platinum base alloy.
3, platinum base alloy as claimed in claim 2, it is characterized in that, said platinum base alloy contains Ir10～20%, Rh5～15%, and at least a element of from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, selecting, and select the content of element or the content sum of more than one selection elements to be about 0.05～1.0% for every kind, surplus is Pt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88107237 CN1009840B (en) | 1988-10-14 | 1988-10-14 | Pt-base alloy for spark plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88107237 CN1009840B (en) | 1988-10-14 | 1988-10-14 | Pt-base alloy for spark plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1035323A CN1035323A (en) | 1989-09-06 |
| CN1009840B true CN1009840B (en) | 1990-10-03 |
Family
ID=4834574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88107237 Expired CN1009840B (en) | 1988-10-14 | 1988-10-14 | Pt-base alloy for spark plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1009840B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106544540A (en) * | 2016-10-31 | 2017-03-29 | 重庆材料研究院有限公司 | A kind of high intensity, high rigidity, wear-resisting precious metal alloys and preparation method |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6262522B1 (en) * | 1995-06-15 | 2001-07-17 | Denso Corporation | Spark plug for internal combustion engine |
| JP2877035B2 (en) * | 1995-06-15 | 1999-03-31 | 株式会社デンソー | Spark plug for internal combustion engine |
| JP3461670B2 (en) * | 1996-06-28 | 2003-10-27 | 日本特殊陶業株式会社 | Spark plug and its manufacturing method |
| US9027524B2 (en) | 2008-01-10 | 2015-05-12 | Ngk Spark Plug Co., Ltd. | Spark plug for internal combustion engine and method of manufacturing the same |
| CN101948965B (en) * | 2010-07-27 | 2012-07-25 | 昆明贵金属研究所 | Novel platinum alloy electrical contact material and preparation method thereof |
| CN107779719B (en) * | 2017-12-15 | 2020-02-07 | 湖南科技大学 | Iridium-nickel-iron alloy and preparation method and application thereof |
| CN113322394B (en) * | 2021-05-13 | 2022-03-01 | 北京有色金属与稀土应用研究所 | High-performance bonded platinum alloy fine material for packaging and preparation method thereof |
-
1988
- 1988-10-14 CN CN 88107237 patent/CN1009840B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106544540A (en) * | 2016-10-31 | 2017-03-29 | 重庆材料研究院有限公司 | A kind of high intensity, high rigidity, wear-resisting precious metal alloys and preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1035323A (en) | 1989-09-06 |
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