Metal-Free Pre-Ceramic Polymers for Wear Protection
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Solution Overview
Problem
Current lubricating oil additives, such as zinc dihydrocarbyl dithiophosphates, contain phosphorus and metals, which are subject to regulatory restrictions and can degrade fluoroelastomer materials, necessitating the development of phosphorus-free and metal-free antiwear additives for crankcase lubricants.
Innovation Solution
Incorporation of metal-free pre-ceramic polymers, specifically silicon-containing polymers like polysilazanes and polysilylcarbodiimides, into lubricating oil compositions to provide antiwear properties without the use of phosphorus or metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus-containing additives like ZDDP are used to provide antiwear properties, then wear protection is improved, but regulatory compliance deteriorates due to phosphorus restrictions
Solution Approach 1:
The invention changes the chemical composition parameters by replacing phosphorus-containing compounds with metal-free pre-ceramic polymers containing silicon, nitrogen, and carbon. This substitution maintains the antiwear function while eliminating phosphorus to comply with regulatory restrictions.
Solution Approach 2:
The invention extracts and removes the harmful phosphorus component from the additive system while retaining the essential antiwear functionality through the use of pre-ceramic polymers that decompose to form protective ceramic layers without phosphorus.
2Reliability
If metal-containing additives like ZDDP and zinc dithiocarbamates are used to provide antiwear properties, then wear protection is improved, but material compatibility deteriorates due to degradation of fluoroelastomer seals
Solution Approach 1:
The invention changes the material composition by eliminating all metal atoms from the additive structure. The metal-free pre-ceramic polymers provide the same boundary lubrication and wear protection mechanisms without the harmful metal-induced degradation of fluoroelastomer seals.
3Reliability
If metal-containing antiwear additives are used to provide wear protection, then antiwear performance is improved, but environmental compliance deteriorates due to metal content restrictions
Solution Approach 1:
The invention fundamentally changes the additive composition from metal-containing to metal-free by using pre-ceramic polymers based on silicon, nitrogen, and carbon. This enables compliance with environmental regulations regarding metal content in lubricants while maintaining effective wear protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The metal-free pre-ceramic polymers effectively inhibit wear in internal combustion engines, offering equivalent or enhanced wear protection compared to traditional phosphorus-containing additives, while eliminating the regulatory and material compatibility issues associated with metal-containing compounds.
Implementation Method 1
The polymers have been widely used to produce ceramic articles and coatings by first forming the article or coating and then subjecting it to a pyrolysis, sintering or other thermal decomposition process
Data Source
AI summary
A lubricating composition comprises an oil of lubricating viscosity, a metal-free pre-ceramic polymer and one or more co-additives. The metal-free pre-ceramic polymer comprises a plurality of repeat units which do not contain oxygen. The pre-ceramic polymers provide the lubricating oil composition with antiwear properties. Also described is a method of lubricating an internal combustion engine and the use of a lubricating oil composition containing a pre-ceramic polymers to inhibit wear in an internal combustion engine.