US3746517A - Hard sintered composition - Google Patents

Hard sintered composition Download PDF

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Publication number
US3746517A
US3746517A US00229960A US3746517DA US3746517A US 3746517 A US3746517 A US 3746517A US 00229960 A US00229960 A US 00229960A US 3746517D A US3746517D A US 3746517DA US 3746517 A US3746517 A US 3746517A
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United States
Prior art keywords
carbide
compositions
hard sintered
percent
molybdenum
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Expired - Lifetime
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US00229960A
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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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Classifications

    • 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

  • This invention relates to hard sintered compositions which are particularly highly resistant to cratering and plowing in machining metals at high speeds.
  • the hard sintered compositions have been widely used. These previous compositions are highly resistant to crateriug, but are poorly resistant to plowing as employed for cutting bits, which is the important field of the application of the compositions.
  • hard sintered compositions consisting essentially of (i) 5% maximum by weight of at least one metal carbide selected from the group consisting of zirconium carbide and vanadium carbide; (ii) maximum by weight of tungsten carbide; (iii) 10 to 50% by weight of binding alloys comprising to 70% by weight based on the binding alloy of at least one material selected from the group consisting of molybdenum and molybdenum carbide, and 75 to by weight based on the binding alloy of at least one metal selected from the group consisting of iron, cobalt and nickel; and (iv) 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.
  • a titanium carbide powder and tungsten carbide powder substantially free of oxides and nitrides were chosen.
  • the binding alloy powder was prepared by milling fifty percent of approximately five microns nickel powder and fifty percent of approximately one micron molybdenum powder. Together with these binding alloy powders, titanium carbide powder and tungsten carbide powder, there were mixed minus 325 mesh powderous materials such as zirconium carbide, vanadium carbide, cobalt, iron or tantalum carbide to manufacture various compositions as shown in the Table I, wherein compositions of this invention are indicated as A, B, C, D, E, F, G and H and the compositions I and J are also shown for a comparison purpose. These compositions refer to the compositions of the compact prior to reaction which may occur during sintering.
  • compositions of this invention TA 13 LE 1 TiC Ni Mo Co WC ZrC VC TnC
  • compositions of this invention :
  • the milling operations were conducted in a stainless steel mill containing cemented tungsten carbide balls, acetone being added to inhibit oxidation of the charge during the one hundred twenty hour milling period. After milling, the acetone was evaporated and four percent wax binder dissolved in benzene was added to the compositions. Upon drying, each of the powderous mixtures was pressed in a steel die at a pressure of about 1.5 tons/cm.
  • the cold pressed compacts were presintered 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 ambient 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 ambient, e.g. in an atmosphere of dry hydrogen, argon 0r helium.
  • 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 1480 centigrade in order to avoid substantial grain growth.
  • the time and 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 presents 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 HS S55C steel at a Brinell hardness of 303 using cutting fluid with a feed of 0.1 millimeter per revolution and a depth of cut of 1.0 millimeter at a surface speed of 30 meters per minute for 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 twenty-five percent to seventy 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.
  • the deficiency of the amount of molybdenum and molybdenum carbide makes said advantage insufiicient, and the excess of them depresses the toughness of the composition.
  • Molybdenum carbide may be applied in the state of a 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 fifty percent of the binding alloy. The deficiency of the amount of the binding alloy depresses the toughness of the composition, and the excess of that depresses the hardness of the composition.
  • Tantalum carbide may take a form of solid solution with titanium carbide before sintering.
  • the composition contain fifteen percent maximum of tungsten carbide to take advantage of the ability of tungsten carbide to make the composition containing it highly resistant to the plastic deformation.
  • the excess of the amount of tungsten carbide depresses the strength of the composition.
  • Hard sintered compositions for use in cutting tools ti; machine metals at high speeds consisting essentially o (i) at least some zirconium carbide up to 5% maximum by weight,
  • binding alloy which comprises,
  • Hard sintered compositions according to claim 1 containing about 1% by weight of zirconium carbide.

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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)
US00229960A 1971-12-23 1972-02-28 Hard sintered composition Expired - Lifetime US3746517A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46104193A JPS5147127B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1971-12-23 1971-12-23

Publications (1)

Publication Number Publication Date
US3746517A true US3746517A (en) 1973-07-17

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US00229960A Expired - Lifetime US3746517A (en) 1971-12-23 1972-02-28 Hard sintered composition

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US (1) US3746517A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5147127B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH591564A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2255505B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE379377B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4046517A (en) * 1975-02-14 1977-09-06 Ltd. Dijet Industrial Co Cemented carbide material for cutting operation
US5736658A (en) * 1994-09-30 1998-04-07 Valenite Inc. Low density, nonmagnetic and corrosion resistant cemented carbides
US20110017520A1 (en) * 2009-07-24 2011-01-27 Diamond Innovations, Inc. Metal-free supported polycrystalline diamond and method to form

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4046517A (en) * 1975-02-14 1977-09-06 Ltd. Dijet Industrial Co Cemented carbide material for cutting operation
US5736658A (en) * 1994-09-30 1998-04-07 Valenite Inc. Low density, nonmagnetic and corrosion resistant cemented carbides
US20110017520A1 (en) * 2009-07-24 2011-01-27 Diamond Innovations, Inc. Metal-free supported polycrystalline diamond and method to form
US8651204B2 (en) * 2009-07-24 2014-02-18 Diamond Innovations, Inc Metal-free supported polycrystalline diamond and method to form

Also Published As

Publication number Publication date
DE2255505B2 (de) 1975-12-18
CH591564A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1977-09-30
SE379377B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-10-06
JPS4869708A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-09-21
DE2255505A1 (de) 1973-06-28
JPS5147127B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1976-12-13

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