Oxidation-Resistant Bronze-PTFE Composition for Uniform Sintered Color
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Solution Overview
Problem
Bronze-polytetrafluoroethylene compounds often exhibit dark streaks and edge zone oxidation during sintering due to insufficient oxygen removal, leading to non-uniform color and increased waste, raw material consumption, and production costs, especially in the automobile industry.
Innovation Solution
The use of bronze particles with a specific elemental composition (10-30% Sn, 2-20% Zn, and 0.1-5% Al or 0.01-0.4% P, with the remainder being Cu and inevitable impurities, eliminates the need for surface coatings, providing inherent oxidation resistance and preventing dark streaks and edge zone oxidation during sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional bronze powder is used without surface coating, then the production process is simpler and more efficient, but dark streaks and edge zone oxidation occur during sintering resulting in non-uniform color
Solution Approach 1:
The patent changes the chemical composition parameters of the bronze powder by adding specific elements (Al: 0.01-5 mass%, Si: 0.01-5 mass%, P: 0.01-0.5 mass%) to conventional bronze (Cu-Sn alloy). This compositional modification enables the bronze to form protective oxide layers during sintering, preventing edge zone oxidation and dark streak formation without requiring surface coatings, thus maintaining production efficiency while achieving uniform color appearance.
Solution Approach 2:
The patent creates a composite bronze material by combining Cu-Sn alloy with additional elements (Al, Si, P) that provide oxidation resistance. This composite bronze powder exhibits both the desired mechanical properties and color uniformity during sintering, eliminating the need for separate surface coating processes while preventing harmful oxidation effects.
2Reliability
If high pressure treatment is applied to remove oxygen, then oxidation during sintering is reduced, but production time and energy consumption increase
Solution Approach 1:
The modified bronze powder is formulated to be self-protecting against oxidation through its inherent composition. The added elements (Al, Si, P) automatically form protective oxide layers on the bronze particle surfaces during sintering, eliminating the need for external high pressure treatment to remove oxygen. This self-service mechanism reduces energy consumption while maintaining reliable oxidation resistance.
3Reliability
If surface coatings are applied to bronze powder, then oxidation resistance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the oxidation protection function from the separate surface coating process and integrates it directly into the bronze powder composition itself. By incorporating Al, Si, and P elements into the bronze alloy, the oxidation resistance is built-in at the material level, eliminating the need for additional surface coating equipment and process steps, thus reducing manufacturing complexity while maintaining reliability.
4Manufacturing precision
If edge zones with oxidation are removed by peeling and cutting, then product quality is improved, but raw material consumption and waste increase
Solution Approach 1:
The modified bronze powder composition prevents edge zone oxidation before it occurs during sintering. The Al, Si, and P elements proactively form protective layers that stop oxidation at the edges, eliminating the need for subsequent peeling and cutting operations. This preliminary anti-action ensures complete utilization of raw materials without waste while maintaining high product quality.
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 bronze-polytetrafluoroethylene compounds produced with these oxidation-resistant bronze particles have a uniform appearance and consistent color, reducing waste and production costs while simplifying the manufacturing process by eliminating the need for additional surface coatings and high-pressure oxygen removal.
Implementation Method 1
the bronze particles have an elemental composition consisting of: Sn in an amount of from 10 to 30 mass%; Zn in an amount of from 2 to 20 mass%; and one of the following elements: Al in an amount of from 0.1 to 5 mass%; or P in an amount of from 0.01 to 0.4 mass%, with the remainder consisting of Cu and inevitable impurities, wherein the bronze particles have no surface coating
Implementation Method 2
followed by sintering the green body, e.g. in air circulation ovens or in the course of ram extrusion
Data Source
Figure 1
AI summary
The present invention relates to a bronze-polytetrafluoroethylene compound based on an oxidation-resistant bronze powder, and to a method for producing the bronze-polytetrafluoroethylene compound. In another aspect, the present invention relates to an oxidation-resistant bronze powder for use in polytetrafluoroethyiene compounds.