Elektroschmelzwerk Kempten Gmbh

Wacker-Chemie Gmbh

Karl-Alexander Schwetz

Lorenz Sigl

Hubert Thaler

Alfred Lipp

Klaus Hunold

Georg P Victor

Dietrich Lange

Thomas Kempf

Thomas Jungling

Max Mohr

Fritz Thuemmler

Wolfgang Grellner

Rainer Oberacker

The invention relates to a polycrystalline SiC shaped body, which consists of 96% by weight to 99.5% by weight of hard-material grains having a core/shell structure, 0 to 0.1% by weight free carbon, remainder a partially crystalline binder phase; having the following properties: density at least 99.5% of the theoretical density, dark green coloring of ground sections or polished surfaces through characteristic light absorption in the orange spectral region at 1.8 to 2.2 eV, resistivity of at least 10 ohm&middot;cm, and fracture toughness of at least 4.0 MPa.m , measured using the bridge method.

Liquid-phase-sintered SiC shaped bodies with improved fracture toughness and a high electric resistance

A composite material includes boron carbide and titanium diboride in a volume ratio B.sub.4 C/TiB.sub.2 of from 90:10 to 10:90 parts and a proportion of elemental carbon greater than 2% by weight up to a maximum of 50% by weight, based on the boron carbide content. The composite material has a density greater than 92% TD, a hardness HK 0.1 greater than 2300, a four-point flexural strength greater than 400 MPa and a fracture toughness greater than 3.5 MPa.sqroot.m. The composite material is suitable for producing wear-resistant components or cutting tools.

Composite materials based on boron carbide, titanium diboride and

A process for producing shaped bodies of boron carbide, metal diboride and carbon, which includes

Process for producing bodies based on boron carbide by pressureless

Composite materials are provided based on titanium diboride and processes for their preparation. The composite materials contain

Composite materials based on titanium diboride

The invention relates to mixed sintered metal materials based on high-melting borides and nitrides and low-melting iron binder metals having the composition:

Mixed sintered metal materials based on borides, nitrides and iron

The invention is a molded body of polycrystalline aluminum nitride having a density of at least 99.8% TD and comprising:

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Sulzberg, Germany

Karl-Alexander Schwetz