Sintered material of spheroidal sintered particles and process for producing thereof
AssigneeWOKA Schweisstechnik GmbH
InventorsEberhard G. Findeisen, Richard F. Moll, Siegmund Kremmer
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Abstract
The invention relates to sintered particles for use in wear applications and to a process for producing the sintered particles. The particles are of substantially spheroidal shape, have a grain size of 20 to 180 μm and have a predominantly closed porosity or are free of pores. The process for producing such particles starts from a powder material with a partially porous internal structure, which is introduced into a furnace and sintered at a temperature at which the material of the metallic binder adopts a pasty state while applying pressure to reduce the pore content of the starting material.
Claims19
A Process for producing spheroidal sintered particles of a predetermined end product mean grain size in the range between 20 and 180 μm,
- comprising the steps of:
- a) providing a starting material,
- said starting material being a powder of substantially spheroidal particles,
- said starting material particles having a partially porous internal structure and a selected starting product mean grain size,
- where said selected starting product mean grain size is greater than said predetermined end product mean grain size,
- said starting material particles consisting of 80-97% by weight of sinterable hard material and 3-20% by weight of metallic binder,
- b) introducing the powder starting material into a furnace,
- c) sintering the powder starting material
- by heating to a temperature at which the material of the metallic binder adopts a pasty state
- and by applying a gas pressure to reduce the pore content of the individual starting material particles,
- thereby reducing the grain size of the individual starting material particles to the predetermined end product mean grain size,
- to produce end product particles having a predominantly closed porosity or being free of pores
- d) cooling and removing the spheroidal end product sintered particles from the furnace.
Sintered Particles
- of substantially spheroidal shape,
- having a grain size of 20 to 180 μm,
- and containing 83 to 97% by weight of sinterable hard material,
- said hard material having a grain size of 0.6 to 5 μm,
- and further containing 3 to 17% by weight of metallic binder,
- said metallic binder having a grain size in the range from 0.6 to 5 μm
- where said particles have a predominantly closed porosity or are free of pores.
Dependencies are inferred from the claim text.