Based on adhesion deformation theory of friction the generation of a frictional force is associated with the rupturing of adhesive bonds and with the deformation of thin surface layers on solid bodies.
Properties of ceramics boron carbide.
High neutron absorption cross section.
Out of all the grades of advanced ceramics boron carbide has the lowest density of 2 5 g cm3 followed by sintered silicon nitride and carbide and aluminium nitride with a density of just over 3 0 g cm3.
Boron carbide b 4 c is one of the world s hardest manufactured materials.
1 the combination of extraordinary high stiffness e 450 gpa and low specific weight 2 52 g cm 3 produces an outstanding stiffness weight ratio compared to all other constructional material types.
With a vickers hardness of 30 gpa it is one of the hardest known materials behind cubic boron nitride and diamond.
The high temperature stability up to 2400 c and the neutron absorption behavior of boron carbide are functionally advantageous for nuclear power plant constructions.
Typical properties for boron carbide are listed in table 1.
Ball roller bearings.
The hardness provides excellent protection while the light weight maximizes mobility.
As such many of its applications revolve around its wear resistance including such uses as abrasives and nozzles.
Boron carbides are often used in ballistic armor taking advantage of exceptional hardness and low density.
Extreme hardness difficult to sinter to high relative densities without the use of sintering aids good chemical resistance good nuclear properties low density.
Boron carbide machining grinding.
Boron carbide is an extremely hard type of ceramic with a low weight.
Boron carbide chemical formula approximately b 4 c is an extremely hard boron carbon ceramic and covalent material used in tank armor bulletproof vests engine sabotage powders as well as numerous industrial applications.
Tribological properties of b 4 c ceramics sometimes are affected by mechanical properties which are in turn controlled by the microstructures of b 4 c ceramics.
Its strong chemical bonds and hard surface minimize wear in rigorous environments.
Mechanical properties of b4c ceramics hot pressed with no additive and crb2 particles distributed in the b4c matrix were measured.
This makes the material extremely useful for nozzles and ballistic applications.
The flexural strength of 675 mpa and the fracture toughness of 2 5.
They are generally heavier than plastics but lighter than steels.
Boron carbide b4c is one of the hardest materials known to man.
