JPS5837275B2 - Boride-based cermet material - Google Patents

Description

Detailed Description of the Invention The present invention comprises one or more borides selected from MB2 type borides and M2B5 type borides, iron carbide, cobalt carbide, nickel carbide, manganese carbide, iron sulfide, cobalt sulfide, A sintered body comprising one or more binders selected from nickel sulfide, manganese sulfide, iron silicide, cobalt silicide, nickel silicide, manganese silicide, iron phosphide, cobalt phosphide, and manganese phosphide. Or use the above mixture as the basic composition and add one more as the third precept, TiC, VC,
ZrC, TaC, NbC, HfC, WC cubic carbide or WC, TiN, TaN cubic nitride, M
o Silicide of S i2, Zr02, T iO, T i
o2 oxide, VBNbB, TaB, CrB, MoB,
WB, NiB, TiB, MnB, FeB, CoB, Ni
This invention relates to a sintered bond formed by adding one or more additives selected from 4B3 borides.

However, M indicates metal. Metal diboride generally has a high melting point, high hardness, and is gold leaf-colored, so it is thought that it can be used in industrial materials such as cutting tools, or jewelry such as watch frames, and attempts are being made to do so.

(JP-A-51-30213, JP-A-47-45868)
.

However, the bonding agents used in these attempts are mainly ferrous metals, but cermets using ferrous metals have a narrow range of appropriate sintering temperatures, require temperature control, and have low strength.

Therefore, efforts were made to discover a bond uniformity of 1 that would widen the appropriate sintering temperature range, but using 1 binder of ferrous metals or Mn phosphides, sulfides, silicides, or carbides would widen the sintering condition range. It turns out that it spreads.

The present invention was made based on this knowledge.

That is, the present invention provides T+ B2 2 TaB2 ,vB
2tNbB2, CrB2, MnB2, ZrB2, AI
B2 , }rfB2W2 B5 , Mo2 M of B5]
At least one type of boride selected from type 32 and M2B5 borides, and iron carbide, cobalt carbide, nickel carbide, manganese carbide, iron sulfide, cobalt sulfide, nickel sulfide, manganese sulfide, iron silicide, and silicide. A sintered body containing 0.1 to 40% by weight of at least one binder selected from cobalt, nickel silicide, manganese silicide, iron phosphide, cobalt phosphide, and manganese phosphide, or a mixture thereof. Basic composition, plus TiC, VC
, ZrC, TaC, NbC, HfC, WC, TiN, T
aN, MoSi2, Zr02, Tio, Ti02
, VB) NbByTaB, CrB, MoB, WB, Ni
B, TiB, M n B t Fe B t Co
The object of the present invention is to provide a sintered body containing one or more additives selected from B, N14, and B3.

As for the metal diboride, M2B5 type boride, carbide, nitride, silicide, oxide, and boride used in the present invention, it is preferable to use fine particles with an average particle size of 5 μm or less.

Iron carbide, cobalt carbide, nickel carbide, manganese carbide, iron sulfide, cobalt sulfide, nickel sulfide, manganese sulfide, iron silicide, cobalt silicide, nickel silicide, manganese silicide, iron phosphide, phosphorus used as binders. The total amount of cobalt oxide and manganese phosphide is 1 piece per o. It is appropriate to mix at a ratio of i to 40%.

If this amount is less than 0.1%, sufficient improvement in mechanical strength cannot be achieved, and if it exceeds 40%, heat resistance is significantly reduced.

As the iron carbide binder, Fe3C and Fe2C are used.
The nickel carbide includes Ni3C, the carbide/l,} includes Co3C, and the manganese carbide includes Mn3c.

Iron sulfide ToshitsumaFeS, Fe2 s3, FeS2
, as cobalt sulfide, CoS, CO2S3, CO3
S4, CO2S, CO9゛S8, Co2S7, NiS, NiS2, Ni3S2 as nickel sulfide, Mn S t Mn2 s4, Mn as manganese sulfide
S2 respectively.

As iron silicide, Fe3 Si2 7Fe2 Si
, FeS i , FeSi2, and CO3Si2, CoSi3, co2S i , Co as cobalt silicide.
Si, CoSi2, Ni3 as nickel silicide
Si, Ni2Si3, Ni3Si2, Ni2Si3
, Ni2Si, NiSi, NiSi2, are manganese silicide, Mn2 S i , MnS i , Mn S
i2, respectively.

Iron phosphide Fe3P, Fe2P, FeP, Fe
If P2 is cobalt phosphide, it is Co2P, Co P
4, Mn2P, MnP as manganese phosphide
y Mn P2 respectively.

Further, carbides, nitrides, silicides, oxides, and borides added as third additive components are suitably added in an amount of 0.1 to 40% by weight.

If this amount is less than 0.1% by weight, sufficient improvement in mechanical strength cannot be achieved, and if this amount exceeds 40% by weight, sinterability will deteriorate.

The material for producing the boride-based cermet material of the present invention is a powder containing one or more metal diborides, W2B5, MO2B5, and a predetermined amount of binder powder, or a powder containing carbides, nitrides, silicides, etc. A powder containing 0.1 to 40% by weight of one or more third additive components selected from oxides and borides is mixed well, and this mixed powder is filled into a mold such as a graphite mold and heated under vacuum. 50k9 in a neutral or reducing atmosphere such as argon or hydrogen gas.
/1 or more, preferably around 200kg/a (7) Under pressure 10.0 0'C or more (1600 to 1900 if possible)
A sintered body can be produced by heating in a wide temperature range (the optimum temperature range is .degree. C.).

Further, these cermet materials can be manufactured by ordinary firing or infiltration methods.

Cermet materials sintered over a wide temperature range have excellent flexural strength, making them ideal for cutting tools and heat engine parts.

The present invention will be explained in more detail with reference to Examples below.

Example I 96% by weight of TiB2 powder was thoroughly mixed with 3% by weight of M02 B5 powder and 1% by weight of FesC powder.

Next, put this mixture into a graphite mold and place it in a vacuum.
It was heated to 1700° C. for 30 minutes while applying a pressure of 200 kg/i.

After straining like this, the transverse rupture force is 200 kg7v? tz
A void-free sintered body with a Vickers hardness of 3000 kg/mA was obtained.

The composition, sintering conditions, and characteristics of the sintered body of the sample thus obtained are shown in the table.

In addition, cases where Co is used as a binder are also shown uniformly.

In the table, TiB2, TaB2, ■
Although only B2, NbB2, MoB2, and CrB2 are shown, the metal diborides in the claims are hexagonal crystal systems, have approximately the same lattice constants, have similar chemical reactivities, and other than those shown in the table. A good sintered body can be obtained even if metal diboride of

Claims (1)

[Claims] I T I B2 t VB2 , NbB2j Cr
B2 j ZrB2 tMOB2 , Mn B2,
One or more metal borides selected from MB2 type borides of H f B2, AI B2 and M2B type borides of Mo2B5, W2B5, iron carbide, cobalt carbide, nickel carbide, manganese carbide, iron sulfide. , cobalt sulfide, nickel sulfide, manganese sulfide, iron silicide, cobalt silicide, nickel silicide, manganese silicide, iron phosphide, cobalt phosphide, manganese phosphide.
A sintered body comprising 0.1 to 40% by weight of one or more binders. 2 T I B2 2 VB2 2 NbB2 ,.
TaB2 2 Cr. B2 2ZrB2 , MoB2
, MnB2 , HfB2 , MB2 type boride of AIB2, Mo 2 B 5 , M2 of W2 B 5
One or more metal borides selected from B5 type borides, iron carbide, cobalt carbide, nickel carbide, manganese carbide, iron sulfide, cobalt sulfide, nickel sulfide, manganese sulfide, iron silicide, cobalt silicide, The basic composition is a mixed powder with 0.1 to 40% by weight of one or more binders selected from nickel silicide, manganese silicide, iron phosphide, cobalt phosphide, and manganese phosphide, and 1 piece Ti
C, VC, ZrC, TaC, NbCtHfC, WC, T
iN, TaN, MoSi2, Zr02, T10t
T + 02 7 VB t NbB t T aB
t C r B , MOB? WB, NiB, TiB
, MnB, FeB, CoB, Ni4 B3 carbides, nitrides, silicides, oxides, and borides.
A sintered body made by adding more than one type of additive.