Binder Component for Particulate Feedstock Compound
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Solution Overview
Problem
Current binder systems in powder injection molding face challenges with shape retention and brown part strength during debinding, particularly due to high viscosity issues that limit geometry and size of components produced, and require elaborate equipment and higher processing temperatures.
Innovation Solution
A binder component comprising 3 to 70% polyolefin or polyolefin wax and 30 to 97% non-polymeric wax, allowing for high flowability and selective debinding, with a DSC melt peak temperature below 180°C and a cross-over temperature below 180°C, enabling easier moldability and reduced equipment size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a binder system with high viscosity is used to ensure adequate green compact strength, then shape retention is improved, but flowability deteriorates and limits geometry and size of components produced
Solution Approach 1:
The binder system is segmented into two distinct components: a polymeric binder (3-70 wt%) providing green compact strength and shape retention, and a wax component (30-97 wt%) providing flowability and reducing viscosity. This segmentation allows each component to fulfill its specific function without compromising the other, resolving the contradiction between strength and flowability.
Solution Approach 2:
The invention uses a composite binder system combining polymeric binder and wax in specific proportions. The polymeric binder provides structural integrity and green compact strength, while the wax component reduces viscosity and enhances flowability. This composite approach allows the binder system to simultaneously achieve both strength and ease of operation.
2Ease of operation
If high injection pressure and high processing temperature are used to achieve adequate flowability, then component geometry is improved, but device complexity and energy consumption increase
Solution Approach 1:
The invention changes the chemical composition parameters of the binder system by incorporating wax (30-97 wt%) with lower melting point and viscosity characteristics. This parameter change allows the feedstock to achieve adequate flowability at lower injection pressures and temperatures, reducing equipment complexity and energy consumption while maintaining component geometry quality.
3Productivity
If all binder ingredients are removed in a single step during debinding, then process time is reduced, but shape retention and brown part strength deteriorate
Solution Approach 1:
The debinding process is segmented into multiple stages based on the different removal characteristics of the binder components. The wax component (30-97 wt%) with lower melting point is removed first, followed by the polymeric binder (3-70 wt%). This segmented approach maintains brown part strength during the process while achieving complete binder removal, resolving the contradiction between productivity and strength.
Solution Approach 2:
The wax component serves as a preliminary binder that is removed first before the main polymeric binder. This preliminary action creates a controlled debinding sequence where the wax removal prepares the structure for subsequent polymeric binder removal, maintaining shape retention and brown part strength throughout the process.
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 binder system enhances flowability and reduces the need for high-pressure injection machines and large molds, enabling the production of intricate and larger parts with improved shape retention and reduced debinding time, while maintaining the structural integrity of the sintered parts.
Implementation Method 1
a DSC melt peak temperature TP below 180°C
Implementation Method 2
a cross-over temperature Tcross below 180°C
Data Source
AI summary
A binder component b) for a particulate feedstock compound for use in a shaping and sintering process contains b-i) 3 to 70% by volume of a polyolefin, a polyolefin wax or an oxidized polyolefin wax, and b-lii) 30 to 97% by volume of a non-polymeric wax or non-polymeric wax-type substance, or a water-soluble or water-dispersible thermoplastic polymer, based on the total volume of the binder component b). The feedstock compound containing the binder component and non-organic sinterable particles is used in an additive manufacturing process, an injection molding process, a pressing process or a casting process.