US3798009A - Hard sintered composition - Google Patents

Hard sintered composition Download PDF

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Publication number
US3798009A
US3798009A US00208064A US3798009DA US3798009A US 3798009 A US3798009 A US 3798009A US 00208064 A US00208064 A US 00208064A US 3798009D A US3798009D A US 3798009DA US 3798009 A US3798009 A US 3798009A
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Prior art keywords
carbide
compositions
hard sintered
percent
titanium carbide
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Expired - Lifetime
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US00208064A
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English (en)
Inventor
S Yamaya
T Sadahiro
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Tungaloy Corp
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Toshiba Tungaloy Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds

Definitions

  • ABSTRACT Primary Examiner-Carl D. Quarforth 7 Assistant Examiner-R. E. Schafer Attorney, Agent, or Firm-Kemon, Palmer & Estabrook [57] ABSTRACT The addition of up to 5 wt.% of zirconium carbide to hard sintered compositions of the titanium carbide type used in cutting tools for machining metals reduces cratering and plowing when machining metals at high speeds.
  • the hard sintered compositions have been widely used. These previous compositions are highly resistant to cratering, but are poorly resistant to plowing when employed for cutting bits, which is the important field of the application of the compositions.
  • hard sintered compositions consisting essentially of: (i) 5 percent maximum by weight of at least one metal carbide selected from the group consisting of zirconium carbide and vanadium carbide; (ii) to 50 percent by weight of binding alloys comprising 25 to 70 percent by weight based on the binding alloy of at least one material selected from the group consisting of mob um. silt199 1124913"!!!.FEEfiPiQEfiPQ.H19 by weight based on the binding alloy of at least one metal selected from the group consisting of iron, cobalt and nickel; and (iii) the balance of titanium carbide.
  • Titanium carbide can be substituted by tantalum carbide to the extent that the amount of the tantalum'carbide weighs less than that of the titanium carbide!
  • the appended drawing depicts relationships between the amount of ZrC and the transverse rupture strength of sintered compact containing ZrC.
  • compositions of this invention is as follows.
  • a titanium carbide powder substantially free of oxides and nitrides was chosen.
  • the binding alloy powder was prepared by milling fifty percent of approximately five microns nickel powder and fifty percent of approx imately one micron molybdenum powder. Together with the binding alloy powder and titanium carbide powder, her widest! n s 325 mesh powderous materials such as zirconium carbide, vanadium carbide, cobalt, iron or tantalum carbide to manufacture various compositions as shown in the Table 1, wherein compositions of this invention are indicated as A, B, C, D, E, F, G and H and the compositions l and H are shown for a comparison purpose. These compositions refer to the compositions of the compact prior to reaction which may occur during sintering.
  • each powderous mixture was pressed in a steel die at a pressure of about 1.5 tons/cm?
  • the cold pressed compacts were presinterd in a hydrogen furnace at 650 Centigrade for one hour to dewax the specimens.
  • Final sintering was performed on an inert stool and in an inert atmosphere at 1350" Centigrade for one hour in an induction furnace. An absolute pressure of about 0.1 to 0.3 micron was maintained in the furnace.
  • the final sintering may be conducted in any suitable inert atmosphere, e.g.
  • the period of sintering time depends on the sintering temperature. As the temperature is raised the sintering period may be shortened. In any event, however, the sintering temperature should not exceed 1,480 Centigrade in order to avoid substantial grain growth.
  • the time end temperature of sintering must be adjusted so that the grain size of titanium carbide in the finished article is not substantially larger than that of the starting powder.
  • Table 2 shows the properties and cutting' performances of the compositions shown in the Table 1.
  • the hardness represents the Rockwell A hardness, and the unit of the transverse rupture strength is a kilogram per square millimeter.
  • the width of plowing, presented by the unit of millimeter, was obtained by cutting a rod of .llS S55C steel at a Brinell hardness of 303 with a feed of 0.1 millimeter per revolution and a depth'of cut of 1.0 millimeter at a surface speed of 30 meter per minutefor one minute.
  • the cutting conditions as described above are generally severe for a cutting bit, and render the bit subject to cratering and plowing at low speeds.
  • the binding alloy contain 25 percent to 70 percent of molybdenum and/or molybdenum carbide to take advantage of the ability of these materials to cause alloys containing them to wet the surface of the hard titanium carbide particles.
  • a deficiency of the amount of molybdenum and molybdenum carbide makes said advantage insufficient, and an excess of them depresses the toughness of the composition.
  • Molybdenum carbide may be applied in the state ofa solid solution with titanium carbide before sintering.
  • iron group metals nickel is preferred as a component of the binding alloy. However, any iron group metals or their alloys, may be employed. It is essential that the compositions contain ten percent to 50 percent of the binding alloy. A deficiency of the amount of the binding alloy depresses the toughness of the composition, and an excess depresses the hardness of the composition.
  • Tantalum carbide may take a form of solid solution with titanium carbide before sintering.
  • Hard sintered compositions consisting essentially of:
  • binding alloy which comprises,

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Ceramic Products (AREA)
US00208064A 1971-10-01 1971-12-15 Hard sintered composition Expired - Lifetime US3798009A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46076313A JPS4840611A (ja) 1971-10-01 1971-10-01

Publications (1)

Publication Number Publication Date
US3798009A true US3798009A (en) 1974-03-19

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US00208064A Expired - Lifetime US3798009A (en) 1971-10-01 1971-12-15 Hard sintered composition

Country Status (9)

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US (1) US3798009A (ja)
JP (1) JPS4840611A (ja)
CA (1) CA939395A (ja)
CH (1) CH564090A5 (ja)
DE (1) DE2163755C3 (ja)
FR (1) FR2155186A5 (ja)
GB (1) GB1328596A (ja)
IT (1) IT945599B (ja)
SE (1) SE379795B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150082945A1 (en) * 2008-12-23 2015-03-26 United Technologies Corporation Process for Producing Refractory Metal Alloy Powders

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5129306A (ja) * 1975-05-12 1976-03-12 Suwa Seikosha Kk Setsusakukoguyochokogokin
JPS5247626U (ja) * 1975-10-01 1977-04-05
JPS5249228U (ja) * 1975-10-03 1977-04-07
JPS52103307A (en) * 1976-02-27 1977-08-30 Mitsubishi Metal Corp Lightweight hard alloy for parts of hot rolling equipment
JPS56137219U (ja) * 1981-02-19 1981-10-17
JPS60141478U (ja) * 1984-02-29 1985-09-19 国産電機株式会社 内燃機関用点火装置
JPH0211738A (ja) * 1988-06-28 1990-01-16 Ngk Spark Plug Co Ltd セラミック−金属摺動構造

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US25815A (en) * 1859-10-18 Improvement in harvesters
GB719896A (en) * 1952-05-30 1954-12-08 Metro Cutanit Ltd Improvements relating to compound materials having high mechanical strength and highresistance to heat and oxidation
US3490901A (en) * 1966-10-24 1970-01-20 Fujikoshi Kk Method of producing a titanium carbide-containing hard metallic composition of high toughness

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US25815A (en) * 1859-10-18 Improvement in harvesters
GB719896A (en) * 1952-05-30 1954-12-08 Metro Cutanit Ltd Improvements relating to compound materials having high mechanical strength and highresistance to heat and oxidation
US3490901A (en) * 1966-10-24 1970-01-20 Fujikoshi Kk Method of producing a titanium carbide-containing hard metallic composition of high toughness

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Schwarzkopf et al., Cemental Carbides, MacMillan, N. Y., 1960, pg. 205, TP 770 53. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150082945A1 (en) * 2008-12-23 2015-03-26 United Technologies Corporation Process for Producing Refractory Metal Alloy Powders
US9028583B2 (en) * 2008-12-23 2015-05-12 United Technologies Corporation Process for producing refractory metal alloy powders

Also Published As

Publication number Publication date
DE2163755C3 (de) 1979-09-27
GB1328596A (en) 1973-08-30
SE379795B (ja) 1975-10-20
IT945599B (it) 1973-05-10
DE2163755A1 (de) 1973-07-26
JPS4840611A (ja) 1973-06-14
CA939395A (en) 1974-01-01
FR2155186A5 (ja) 1973-05-18
CH564090A5 (ja) 1975-07-15
DE2163755B2 (de) 1976-05-20

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