Complex Titanate Friction Material for Stable Copper-Free Braking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Copper-free friction materials face challenges in reducing aggressiveness to counterparts due to the absence of a cohesive film, leading to metal lump formation and increased wear, which existing technologies have not adequately addressed.
Innovation Solution
A complex titanate compound is developed by bonding primary particles of alkali metal titanate and alkaline earth metal titanate to form secondary particles with specific characteristics, such as a controlled particle diameter and surface area, to enhance friction stability and reduce aggressiveness when used in friction materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If copper is eliminated from friction materials to meet environmental requirements, then environmental compatibility is improved, but aggressiveness to the counterpart increases due to absence of protective copper film
Solution Approach 1:
The patent introduces a complex titanate compound as an intermediary substance to replace copper's protective function. This compound forms a protective film on the counterpart surface through controlled metal lump formation, preventing direct aggressive interaction between friction material and counterpart while maintaining environmental compatibility through copper-free composition
Solution Approach 2:
The patent modifies the chemical composition parameters by eliminating copper and introducing specific titanate compounds with controlled particle size distribution (1-80 μm average diameter) and surface area (1-6 m²/g). These parameter changes enable the formation of a protective film that suppresses aggressiveness while maintaining environmental compatibility
2Object-affected harmful factors
If copper is eliminated from friction materials, then environmental compatibility is improved, but friction coefficient stability deteriorates due to inability to maintain protective film at high temperature
Solution Approach 1:
The complex titanate compound acts as an intermediary that maintains friction coefficient stability through controlled film formation. The specific particle characteristics (1-80 μm diameter, 1-6 m²/g surface area) enable consistent film formation at high temperatures, replacing copper's thermal stability function while maintaining environmental compatibility
Solution Approach 2:
The patent uses a composite titanate compound combining alkali metal titanate and alkaline earth metal titanate in specific proportions. This composite structure provides both environmental compatibility and friction coefficient stability through synergistic effects of different metal components in the protective film
3Object-affected harmful factors
If copper-free friction materials are used, then environmental compatibility is improved, but wear protection deteriorates due to metal lump agglomeration and lack of cohesive film formation
Solution Approach 1:
The complex titanate compound serves as an intermediary that transforms harmful metal lump agglomeration into a beneficial protective mechanism. By controlling particle size and surface area, the compound promotes formation of a distributed protective layer that prevents direct metal-to-metal contact and reduces wear, replacing copper's cohesive film function
Solution Approach 2:
The patent utilizes the porous structure characteristics of the complex titanate compound with specific surface area (1-6 m²/g) to create a protective film with controlled porosity. This porous structure allows for effective wear protection through mechanical interlocking and distributed stress, while maintaining environmental compatibility through copper-free composition
Data Source
AI summary
This composite titanium oxide compound is a composite titanium oxide compound wherein primary particles of an alkali metal titanate compound and primary particles of an alkaline earth metal titanate compound are joined to form secondary particles. The secondary particles have an average particle size of 1 to 80 μm. When the concentration of elements in the secondary particles is analyzed, a region where the alkaline earth metal is detected covers 50% or more of the surface area in 3% or less of the total number of secondary particles.