US2432888A - Platinum base alloy and spark plug electrode - Google Patents

Platinum base alloy and spark plug electrode Download PDF

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Publication number
US2432888A
US2432888A US543193A US54319344A US2432888A US 2432888 A US2432888 A US 2432888A US 543193 A US543193 A US 543193A US 54319344 A US54319344 A US 54319344A US 2432888 A US2432888 A US 2432888A
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US
United States
Prior art keywords
spark plug
base alloy
plug electrode
platinum base
platinum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US543193A
Inventor
Franz R Hensel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duracell Inc USA
Original Assignee
PR Mallory and Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to US543193A priority Critical patent/US2432888A/en
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Publication of US2432888A publication Critical patent/US2432888A/en
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/04—Alloys based on a platinum group metal

Definitions

  • An object of the invention is to improve such.
  • Platinum-molybdenum alloys have been proposed for spark plug electrodes. Such alloys are relatively hard and resistant to deflection at high temperatures. Moreover they remain bright and untarnished when heated in air. However, they are somewhat subject to grain growth and this becomes more marked when the electrode is fused directly into the ceramic of the spark plug.
  • the alloy and electrode material of the present invention may have the following composition:
  • Platinum Balance 2 may be welded to the end of a nickel rod.
  • One specific composition which is suitable for spark plug electrodes consists of Per cent Thorium Molybdenum -i- 4 Platinum 95.5
  • molybdenum and the balance platinum serving to inhibit grain growth in said electrode.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Spark Plugs (AREA)

Description

Patented Dec. 16, 1947 PLATINUM BASE ALLOY AND SPARK PLUG ELECTRODE Franz R. Hensel, Indianapolis, Ind., assignor to P. R. Mallory & (30., Inc., Indianapolis, Ind., a
corporation of Delaware No Drawing. Application July 1, 1944, Serial No. 543,193
2 Claims. I (Cl. 75172) This invention relates to platinum base alloys and electrodes made therefrom.
An object of the invention is to improve such.
alloys and electrodes.
Platinum-molybdenum alloys have been proposed for spark plug electrodes. Such alloys are relatively hard and resistant to deflection at high temperatures. Moreover they remain bright and untarnished when heated in air. However, they are somewhat subject to grain growth and this becomes more marked when the electrode is fused directly into the ceramic of the spark plug.
I have found that this grain growth can be inhibited and an electrode material produced which remains fine grained even after continued heating by the addition of thorium.
The alloy and electrode material of the present invention may have the following composition:
Per cent Thorium .05 to 3 Molybdenum- .5 to 10 Platinum Balance 2 may be welded to the end of a nickel rod. One specific composition which is suitable for spark plug electrodes consists of Per cent Thorium Molybdenum -i- 4 Platinum 95.5
molybdenum and the balance platinum, said thorium serving to inhibit grain growth in said electrode.
FRANZ R. HENSEL.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,872,065 Duffenback Aug. 16, 1932 2,344,597 Chaston et a1. Mar. 21, 1944 1,948,445 Lederer Feb. 20, 1934
US543193A 1944-07-01 1944-07-01 Platinum base alloy and spark plug electrode Expired - Lifetime US2432888A (en)

Priority Applications (1)

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US543193A US2432888A (en) 1944-07-01 1944-07-01 Platinum base alloy and spark plug electrode

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Application Number Priority Date Filing Date Title
US543193A US2432888A (en) 1944-07-01 1944-07-01 Platinum base alloy and spark plug electrode

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US2432888A true US2432888A (en) 1947-12-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537733A (en) * 1950-05-01 1951-01-09 Adolph Cohn Variable resistor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1872065A (en) * 1928-10-11 1932-08-16 Ac Spark Plug Co Spark plug electrode and other electron emitting device
US1948445A (en) * 1927-04-12 1934-02-20 Ernest Anton Lederer Electron emitting body and the process for its manufacture
US2344597A (en) * 1941-03-18 1944-03-21 Johnson Matthey Co Ltd Electrode for sparking plugs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1948445A (en) * 1927-04-12 1934-02-20 Ernest Anton Lederer Electron emitting body and the process for its manufacture
US1872065A (en) * 1928-10-11 1932-08-16 Ac Spark Plug Co Spark plug electrode and other electron emitting device
US2344597A (en) * 1941-03-18 1944-03-21 Johnson Matthey Co Ltd Electrode for sparking plugs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537733A (en) * 1950-05-01 1951-01-09 Adolph Cohn Variable resistor

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