Nitrogen-Containing Polymer Binder for Metal Powder Adhesion
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Solution Overview
Problem
Conventional binder formulations in powder metallurgical processes often result in pre-sintered parts with inadequate strength, particularly when using metal powders other than steel, and can have viscosity issues that affect the jetting and homogeneity of the final printed parts in additive manufacturing.
Innovation Solution
A binder formulation comprising a water-soluble polymer with a nitrogen-containing repeat unit is combined with a metal powder, enhancing adhesion properties and mechanical strength of pre-sintered parts, suitable for various powder metallurgical processes including those involving copper or noble metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional binder formulations are used in powder metallurgical processes, then the formulation can be applied to various metal powders, but the pre-sintered parts have inadequate strength
Solution Approach 1:
The patent modifies the chemical composition parameters of the binder formulation by incorporating nitrogen-containing compounds such as gelatin, casein, or polyvinylpyrrolidone. This chemical parameter change enables the binder to achieve adequate adhesion strength with diverse metal powders including copper, brass, bronze, and precious metals, resolving the strength deficiency while maintaining broad metal powder compatibility
Solution Approach 2:
The invention creates a composite binder system by combining nitrogen-containing organic compounds with traditional binder components. This composite formulation integrates the adhesion-enhancing properties of nitrogen-containing polymers with the functional characteristics of conventional binders, achieving both improved pre-sintered part strength and consistent performance across different metal powder types
2Manufacturing precision
If conventional binder formulations are used, then the formulation can be processed through additive manufacturing, but viscosity issues affect jetting and homogeneity of final parts
Solution Approach 1:
The patent adjusts the viscosity parameters of the binder formulation by selecting nitrogen-containing compounds with appropriate molecular weights and chain structures. Gelatin, casein, and polyvinylpyrrolidone provide optimal viscosity characteristics that enable smooth jetting through additive manufacturing print heads while maintaining homogeneous distribution throughout the metal powder, eliminating both jetting defects and homogeneity issues
Solution Approach 2:
The nitrogen-containing binder compounds act as an intermediary substance that mediates between the liquid carrier and metal powder particles. This intermediary binder formulation achieves optimal rheological properties for jetting while ensuring uniform adhesion to metal surfaces, resolving the conflict between manufacturability and manufacturing precision
3Strength
If a binder formulation is used to join metal powder particles, then green strength and green density are improved, but the binder components must be removed through heat processing
Solution Approach 1:
The patent selects nitrogen-containing binder compounds with specific thermal decomposition characteristics. Gelatin, casein, and polyvinylpyrrolidone decompose at controlled temperature ranges, allowing complete binder removal through heat processing while maintaining high green strength during the binding phase. The thermal parameter optimization ensures maximum binding performance followed by clean binder elimination without metal powder degradation
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 use of a nitrogen-containing polymer binder formulation improves the mechanical strength and handling of pre-sintered parts, leading to better process quality and manufactured part integrity, particularly for metals like copper and noble metals, while maintaining suitable viscosity for additive manufacturing processes.
Implementation Method 1
The use of a nitrogen-containing polymer binder formulation improves the mechanical strength and handling of pre-sintered parts... enhancing adhesion properties
Data Source
AI summary
The present invention generally relates to compositions comprising a binder and a metal powder, and associated methods. Some compositions provided include a polymer and a metal powder. Some compositions provided include a binder formulation and a metal powder. The binder formulation generally includes a first liquid and a polymer. The binder formulation may be a solution. The polymer may include a nitrogen-containing repeat unit. The metal powder may include a noble metal. Some methods provided include combining a metal powder with a binder formulation. Methods provided include but are not limited to additive manufacturing processes and injection molding processes.