Si-C-N Coated Forming Tools for Corrosion Resistance
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Solution Overview
Problem
Existing forming tools used in plastics and aluminum processing operations face challenges in productivity, economy, and manufacturing process reliability, with limited service life and susceptibility to corrosion and wear.
Innovation Solution
A forming tool substrate coated with a Si—C—N-based layer, comprising silicon, carbon, and nitrogen as main components, which is deposited as the outermost layer to enhance corrosion resistance, inertness, and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coatings (chromium plating, chemical nickel) are used on forming tools, then corrosion and wear resistance are improved, but service life is still limited and productivity requirements are not met
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by using Si-C-N-based materials with specific atomic ratios (Si: 20-40 at%, C: 30-50 at%, N: 10-30 at%). This compositional parameter change creates a coating with superior corrosion and wear resistance compared to conventional chromium or chemical nickel coatings, directly resolving the limitation of service life while maintaining reliability.
Solution Approach 2:
The patent employs a composite coating system consisting of multiple layers: an adhesion layer (Cr, CrN, or CrCN), an intermediate layer (TiN, TiAlN, or CrN), and a top Si-C-N-based layer. This composite structure combines the advantages of each material - adhesion promotion, mechanical strength, and chemical inertness - achieving extended service life and enhanced reliability that single-layer conventional coatings cannot provide.
2Productivity
If forming tools are used to meet increasing productivity demands, then output increases, but tool service life decreases due to increased wear and corrosion
Solution Approach 1:
The Si-C-N-based coating with optimized atomic composition provides exceptional wear resistance, allowing forming tools to withstand the intensified operational conditions required for high productivity. The coating maintains its protective properties even under increased mechanical and thermal stress, enabling sustained high-output production without premature tool failure.
Solution Approach 2:
The patent applies the coating treatment before the forming tool enters production service. The multi-layer coating structure is pre-established with the Si-C-N-based top layer providing immediate protection against wear and corrosion. This preliminary protective action ensures the tool is ready for high-productivity operations from the start, eliminating the need for frequent maintenance interruptions.
3Adaptability or versatility
If forming tools process plastics and aluminum materials, then manufacturing capability is provided, but tool material reacts with or sticks to molten materials, reducing efficiency
Solution Approach 1:
The Si-C-N-based coating creates a chemically inert surface environment that prevents reactions between the forming tool and molten plastics or aluminum materials. The coating's chemical stability ensures no adverse interactions occur during processing, eliminating sticking and reaction-related productivity losses while maintaining versatility across different material types.
Solution Approach 2:
The coating acts as an intermediary layer between the forming tool substrate and the molten materials being processed. This intermediate Si-C-N-based layer provides a non-stick surface that facilitates easy release of processed parts, significantly improving manufacturing efficiency for both plastics injection molding and aluminum die casting operations.
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 Si—C—N-based coating significantly increases the service life of forming tools, improves corrosion resistance, and reduces the tendency of the tool material to react with plastics or stick to molten materials, thereby enhancing productivity and manufacturing reliability.
Implementation Method 1
a substrate surface coated with a coating comprising a Si—C—N-based layer comprising silicon, carbon and nitrogen as main components
Data Source
AI summary
Coated forming tool for processing of plastics materials or aluminum or aluminum alloy materials, comprising a substrate having a substrate surface, wherein the substrate surface is coated with a coating formed of one or more layers, wherein the coating comprises a Si—C—N-based layer having element composition in atomic percentage corresponding to SiaCbNcXd with 50<a+b+c≤100, 0≤d<60, preferably 0≤d<50, wherein X is one or more elements selected from the elements hydrogen, oxygen, titanium, chromium, and/or aluminum.