Cermets


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Cermets

 

(ceramals), heterogeneous compositions of metals or alloys with one or more ceramic phases of relatively low mutual solubility.

Cermets combine the properties of ceramics (great hardness, resistance to wear, refractoriness, heat resistance) and metals (thermal conductivity and ductility). The ceramic components include oxides (Al2O3, Cr2O3, SiO2 and ZrO2), carbides (SiC, Cr3C2, and TiC), borides (Cr3B2, TiB2, and ZrB2), suicides (MoSi), and nitrides (TiN); the metallic components include chromium, nickel, aluminum, iron, cobalt, titanium, and zirconium and the alloys based on them. The ceramic phase content varies from 15 to 85 percent (by volume). Articles are produced by the methods of powder metallurgy, that is, by compacting the powder blanks and then sintering in a reductive or neutral atmosphere. Cermets are used in the form of hard alloys in manufacturing parts for turbines and airplane engines and in producing friction parts, tools, and other articles that are subject to increased loads while operating in aggressive media and at high temperatures.

REFERENCES

Kermety. Edited by J. R. Tinklepaugh and W. B. Crandall. Moscow, 1962. (Translated from English.)
Novye materialy v tekhnike. Moscow, 1964.
Eisenkolb, F. Uspekhi poroshkovoi metallurgii. Moscow, 1969. (Translated from German.)
References in periodicals archive ?
Grades include carbide, HSS, ceramic, cermet, cBN/PcBN, and diamond.
The first technology is MesoCoat's PComP[TM] life extending nanocomposite cermet coating materials.
1995] reported on 37 children treated using a split mouth trial of a cermet (Ketac Silver Aplicap[R]) and a GIC (Ketac Fil[R]) in Newcastle Dental School (England).
MEGACOAT Cermets are capable of running wet or dry, allowing reduced coolant costs and easier recycling of metal chips.
They cover the fundamentals, friction and wear in structural ceramics, bioceramics and biocomposites, nanoceramics, lightweight composites and cermets, ceramics in a cyrogenic environment, and the water-lubricated wear of ceramics.
Thorium cermets imported into the EU from South Korea currently attract 5.
Mathematical relations in particulate materials processing; ceramics, powder metals, cermets, carbides, hard materials, and minerals.
Hardness Range Cutting Tool Material Up to low 40s Rockwell C Coated Carbide Mid to tipper 40s Rockwell C Cermets and Coated Cermets Up to low 60s Rockwell C Ceramic and Silicon Nitride Mid 50s to Mid 60s Rockwell C CBN (Cubic Boron Nitride)
Besides the classical WC-Co hardmetal substrates the PVD coatings on TiC-NiMo cermets were studied.
All carbide must be free of ceramics, cermets, and steel, and shipped in closed containers not exceeding 1,0001b.