摘要:
A composition of matter suitable for use as a lapping composition is provided which has improved lubricity, abrasive suspension and cleanability and which contains an amide of the formula R 1 CON (R 2 0H) (R 3 0H) in an amount of 4% to 20% by weight and an oil in an amount of 65% to 96% by weight. The lapping composition may have a wide range of amounts of water mixed into it to form a water-in-oil emulsion in which an abrasive agent may be suspended. Because of the wide ratios available between the water and oil phase amounts, the emulsion can be prepared relatively oil rich for fine lapping operation and may later be diluted for rough lapping operation.
摘要:
Aluminous proppant media in the form of sintered bauxite spheres containing silica are improved in resistance to stress corrosion by inclusion of zirconia in the mix prior to firing in the amount of a silica to zirconia ratio of from 6/1 to 20/1.
摘要:
The present invention provides a nearly fully dense, microcrystalline, composite ceramic abrasive particle comprising grains of alumina, gamma-aluminum oxynitride and, optionally, a Periodic Group IVB metal nitride in the system Al₂O₃/ALON/Group IVB metal nitride. In another aspect, two different processes for making an abrasive particle such as an abrasive grit, comprising a multiphase mixture of microcrystalline components in this system using sol gel techniques and pressureless reaction-sintering, are disclosed.
摘要:
A method of making sintered aluminous abrasive particles comprises: mixing a quantity of uncalcined bauxite and sulphuric acid to dissolve the acid-soluble portion thereof and form principally aluminium sulphate hydrate; calcining the aluminium sulphate hydrate to separately form gamma alumina and sulphur trioxide; forming the gamma alumina into an unfired body; breaking the unfired body into granules; and sintering the granules to convert the gamma alumina granules into sintered abrasive aluminous material of alpha alumina.
摘要:
The hardness and microstructure of aluminous abrasives produced from alumina gels are enhanced by introduction of seed material as by wet vibratory milling of the material with alumina media, or by the direct addition of very fine alpha alumina particles in the amount of 1% or less.
摘要:
A diamond abrasive body which comprises a coherent, skeletal diamond mass constituting at least 70 percent by volume of the body and a glass phase comprising up to 30 percent by volume of the body uniformly dispersed throughout the diamond mass. The glass phase has a melting point in the range 800 to 1400°C. The abrasive body has good thermal stability and strength making it suitable for use as an insert for tools such as dressing tools and surface set drill bits. The abrasive body is produced by infiltrating molten glass into a coherent skeletal diamond mass. The glass phase is preferably transformed to a ceramic form by heat treatment of the infiltrated diamond mass.
摘要:
Improved performance or low cost with equivalent performance can be achieved in heavy duty steel snagging wheels by substitution, for conventional grits, up to 75% by volume of spherical sintered aluminous grits.
摘要翻译:通过替代常规砂粒,高重量钢sn ging ging ging ging of of of of of of of。。。。。。。。。。。。。。。。。。。。。。。
摘要:
L'invention concerne un dispositif de solidification et de refroidissement rapides, par coulée continue, de produits fondus à base d'oxydes métalliques. Ce dispositif comprend essentiellement une alimenta tion contrôlable en produit fondu, deux cylindres metalliques d'axes parallèles et sensiblement horizontaux, tournant en sens inverse, aminés d'une vitesse périphérique sensible ment égale, dont les axes sont écartés d'une distance égale à la somme des rayons de chaque cylindre augmentée d'au moins un millimètre, au moins un moyen de refroidissement et un moyen de mise en rotation synchrone, en sens opposé et à une vitesse réglable desdits cylindres et un moyen de récupération du produit solidifié. Il s'applique, en particulier, à l'obtention d'abrasifs à cristallisation fine à base de corindon ou de corindon- zircone.