摘要:
La présente invention se rapporte à une pièce d'usure hiérarchique comportant une partie renforcée comprenant de l'alumine, de la zircone ou un alliage d'alumine-zircone, ladite partie renforcée comprenant également des inserts centimétriques de géométrie prédéfinie, lesdits inserts comportant des particules micrométriques de carbures, nitrures, borures métalliques ou en composés intermétalliques liées par une première matrice métallique, lesdits inserts étant insérés dans une structure de renfort infiltrée par une seconde matrice métallique, la structure de renfort comportant une alternance périodique de zones millimétriques à forte et à faible concentration de particules micrométriques d'alumine, de zircone ou d'un alliage d'alumine-zircone, la seconde matrice métallique étant différente de la première matrice métallique.
摘要:
Method to make a tubular element (10) to transfer abrasive materials such as concrete, inert materials or suchlike, wherein the tubular element (10) comprises an external tubular component (11) made of steel and an internal tubular component (12), coaxial to the external tubular component (11). The internal tubular component (12) is made of chromium carbide, or other similar material resistant to wear.
摘要:
A system and method of forming a wear resistant composite material includes placing a porous wear resistant filler material in a mold cavity and infiltrating the filler material with a matrix material by heating to a temperature sufficient to melt the matrix material, then cooling the assembly to form a wear resistant composite material. The system and method can be used to form the wear resistant composite material on the surface of a substrate, such as a part for excavating equipment or other mechanical part. One suitable matrix material may be any of a variety of ductile iron alloys.
摘要:
Embodiments of wear resistant ferrous alloys are disclosed herein. In some embodiments, ferrous alloys can have a matrix which includes near spherical and hypereutectic borides and/or borocarbides while at the same time avoiding the formation of rod-like borides and/or borocarbides. In some embodiments, the wear resistant ferrous alloys can be used as a coating, such as a hardfacing layer, to add protection to different components.
摘要:
A cast component includes a cast body that has a single crystal microstructure and an internal corner bounding an internal cavity. The single crystal microstructure defines a critical internal residual stress with respect to investment casting of the cast body using a refractory metal core beyond which the single crystal microstructure recrystallizes under a predetermined condition. The internal corner has a corner radius that is greater than a critical corner radius below which an amount of internal residual stress in the single crystal microstructure exceeds the critical internal residual stress. The internal cavity includes a cross section less than about 20 mils near the corner radius.
摘要:
A cast component includes a cast body that has a single crystal microstructure and an internal corner bounding an internal cavity. The single crystal microstructure defines a critical internal residual stress with respect to investment casting of the cast body using a refractory metal core beyond which the single crystal microstructure recrystallizes under a predetermined condition. The internal corner has a corner radius that is greater than a critical corner radius below which an amount of internal residual stress in the single crystal microstructure exceeds the critical internal residual stress. The internal cavity includes a cross section less than about 20 mils near the corner radius.