Lapping compositions comprising an aluminum, dialkyl orthophosphate gelling agent
AssigneeBorg-Warner Corporation
InventorJan Willem van Hesden
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Abstract
An improved lapping composition for use in lapping the surfaces of parts such as gears, seals, rings, and the like comprises a hydrocarbon liquid which is gelled by the addition of an alkyl orthophosphate gelling agent and to which is added the abrasive grit. The thixotropic character of the composition provides greatly improved suspension of the abrasive grit and highly desirable flow characteristics under shear, and results in an unexpected improvement in lapping rates.
Claims7
A gelled hydrocarbon composition for use in lapping operations comprising a liquid hydrocarbon having a Brookfield viscosity of less than about 200 cps. and a flash point above about 100.degree. F, from about 0.1 to about 10% by weight based on liquid hydrocarbon of the pseudo double salt of an alkyl orthophosphoric acid as a gelling agent, said pseudo double salt being the product of the neutralization of an acidic non-stoichiometric aluminum salt of an alkyl orthophosphoric acid with a base selected from the group consisting of ammonia and basic compounds of alkali metals and alkaline earth metals, and from about 0.1 to about 20 lbs. of a lapping abrasive per gallon of liquid hydrocarbon.
In a lapping operation wherein the surfaces of parts are subjected to low pressure abrading by contacting the part surface with a lapping surface and feeding to the contacting surfaces a lapping composition comprising a liquid hydrocarbon and an abrasive grit, the improvement wherein the lapping composition is gelled by adding thereto from about 0.1 to about 10 wt. per cent based on liquid hydrocarbon of the pseudo double salt of an alkyl orthophosphoric acid as a gelling agent.
A method for lapping surfaces comprising the steps of contacting a part surface and a lapping surface under low pressure abrading conditions and feeding to the contacting surfaces a gelled lapping composition comprising a liquid hydrocarbon having a Brookfield viscosity of less than about 200 cps. and a flash point above about 100.degree. F., from about 0.1 to about 10% by weight based on liquid hydrocarbon of the pseudo double salt of an alkyl orthophosphoric acid as a gelling agent and from about 0.1 to about 20 lbs. of a lapping abrasive per gallon of liquid hydrocarbon.
Dependencies are inferred from the claim text.