Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K25/00—Details relating to contact between valve members and seats
  • F16K25/005—Particular materials for seats or closure elements
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C33/00—Making ferrous alloys
  • C22C33/02—Making ferrous alloys by powder metallurgy
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C33/00—Making ferrous alloys
  • C22C33/02—Making ferrous alloys by powder metallurgy
  • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
  • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
  • C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/18—Other cylinders
  • F02F1/20—Other cylinders characterised by constructional features providing for lubrication
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/02—Parts of sliding-contact bearings
  • F16C33/04—Brasses; Bushes; Linings
  • F16C33/06—Sliding surface mainly made of metal
  • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
  • F16C33/121—Use of special materials

Definitions

• This invention relates to wear resistant materials suitable for the production of sleeve valves and valve seating rings.
• the present invention relates to a wear resistant material which is suitable for sleeve Valves and valve seating rings, said material being produced generally in accordance with my above referred-to method.
• an addition of 0.5 to 5% of nickel is made to the sinter iron which contains approximately 1 to 4% of lead, before it is subjected to the described method.
• the material produced in this manner is of increased forgeability and is therefore also particularly suited to the rolling, pressing and drawing of pipes.
• the material has a coefficient of expansion which is in the range of that of cylinder heads made from light metals, so that the material is particularly suited for valve sleeves and valve seating rings.
• the strength of the material when compared with a material having no addition of nickel, is increased by 20% and expansion is increased by approximately i.e. from 2% to 4%.
• a sintered alloy material having the following composition:
• the mate-rial should have an increased resistance to heat, i.e., sufiicient strength at temperatures up to 600 C. It has now been found quite unexpectedly that a material which has been subjected to the treatment described above has a heat resistance of over 200 Brinell up to 600 C., if in accordance with a preferred feature of the invention it contains, in addition to 1 to 4% of lead and 0.5 to 5% of nickel, amounts of cobalt and molybdenum in a ratio of from 8:1 prior to treatment, the molybdenum content amounting to 1.2 to 1.8%.
• valve seating rings particularly suitable for metor vehicle exhausts can be produced from a material remainder iron, approximately 82% with the normal Sma l amount of impurities.
• the mixed powder was subjected to briquetting at a pressure of 3.5 tons/cmf whereupon it was sintered at a temperature of 1100 C. in a neutral furnace atmosphere for three hours. Analysis of the unworked pieces revealed the following composition:
• the unworked pieces were then subjected to a cold compression at a pressure of 12 tons/cmF, brought to a temperature of 830 C. for 15 minutes and t'hen quickly cooled and tempered for 30 minutes at 80 C., whereupon the Brinell strength of the material was approximately 250 kg./mm. at normal temperature (20 C.) and lower than 100 kg./mm. at a temperature of 600 C.
• the specific gravity had risen from 6.7 to 7.3.
• the bending limit was 46.3 kg./mm.
• the sintered pieces were cooled, subjected to a cold compression at a pressure of 12 tons/cm. and heated for a. time period of 15 minutes to a temperature above the Ac 3-point; after quickly cooling they were finally tempered at temperatures of 580 C. for 30 minutes.
• the Brinell strength of the material was about 320 kg./mm. at normal temperature (20 C.) and about 205 kg./mm. at a temperature of 600 C.
• the sinter iron materials are generally briquetted at a pressure of from 3 to 5 tons/cm.
• the briquette is typically sintered at a temperature of from 1050 C. to 1150 C. for a time period of approximately from 2 to 4 hours.
• the sintered briquette is subsequently compressed at pressures from 10 to 15 tons/cm.
• the final tempering step is conducted at temperatures of from 550 to 650 C. for a time period of from 20 to 40 minutes.
• a method of producing sinter powder metal iron materials which includes the steps of: to the total of iron powder to be processed admixing of from 0.8 to 1.5 of graphite, of from 1 to 4% of lead, and of from 0.5 to 5% of nickel, adding cobalt and molybdenum thereto in mixture ranging from 9.6 to 14.4% of cobalt and from 1.2 to 1.8% of molybdenum for increasing heat resistant stability of the sinter materials up to substantially 600 C., briquetting the thus obtained mixture at a pressure of from 3 to 5 ton-s/cm. sintering the briquetted material at a temperature of from 1,050" C. to 1,150 C.
• a sintered heat treated alloy material composed of from 0.8 to 1.5% of C, from 0.15 to 0.2% of Si, from 0.12 to 0.18% of Mn, from 0.02 to 0.03% of P, from 0.3 to 0.4% of Sn, from 0.5 to 1.0% of Cu, from 1.0 to 4.0% of Pb, from 0.5 to 5% of Ni, from 1.2 to 1.8% Mo, from 9.6 to 16.2% C0 and the remainder Fe.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Combustion & Propulsion (AREA)
• Powder Metallurgy (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=11133918

Family Applications (1)

Country Status (4)

Cited By (14)

Citations (7)

• 1966
  • 1966-05-03 GB GB19452/66A patent/GB1088588A/en not_active Expired
  • 1966-05-05 US US547778A patent/US3471343A/en not_active Expired - Lifetime
  • 1966-05-06 BE BE680620D patent/BE680620A/xx not_active IP Right Cessation
  • 1966-05-06 SE SE6253/66A patent/SE309676B/xx unknown

Patent Citations (7)

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