Iron Boron Sintering Composition for High Density Additive Manufacturing
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Solution Overview
Problem
Current three-dimensional printing techniques using sintering of binder-fixed models achieve only 50%-60% of the theoretical density for iron-based sintered powders, resulting in unsatisfactory material properties due to non-uniform composition and microstructure, which limits their application in mechanical, electrical, and thermal properties.
Innovation Solution
A sintering composition comprising a first metallic iron-containing powder, a boron-containing powder, and optionally a second metallic iron-containing powder with different composition or size distribution, combined in specific weight ratios, along with a binder phase, is used to form a sintered model that is then fused through heat and pressure, potentially reaching higher densities and improved surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional sintering of binder-fixed models is used, then the process is simple and achievable, but the final density only reaches 50%-60% of theoretical density
Solution Approach 1:
The patent changes the chemical composition parameters by introducing boron-containing additives (0.1-5 wt% boron powder, boron carbide, or boron nitride) to the iron-based powder mixture. This compositional parameter change enables the sintering process to achieve densification beyond the traditional 50-60% threshold, reaching up to 95% of theoretical density while maintaining process feasibility
Solution Approach 2:
The patent creates a composite powder mixture consisting of iron-based powder (95-99.9 wt%), boron-containing additive (0.1-5 wt%), and optional bronze powder (0.1-5 wt%). This composite material approach allows the sintered product to achieve high density and improved mechanical properties without requiring complex infiltration processes
2Manufacturing precision
If infiltration with bronze alloy is performed to increase density, then the product density increases, but the composition becomes non-uniform
Solution Approach 1:
The patent performs preliminary action by incorporating the boron-containing additive and optional bronze powder directly into the green compact during the sintering process itself, rather than performing infiltration as a subsequent separate step. This ensures uniform distribution of all components throughout the sintered product, achieving both high density and composition uniformity simultaneously
3Manufacturing precision
If higher density is achieved through traditional methods, then material properties improve, but the process complexity increases
Solution Approach 1:
The patent merges the densification and composition uniformity objectives into a single sintering operation. By combining iron-based powder, boron-containing additive, and optional bronze powder into one homogeneous mixture and processing it through one sintering cycle, the method achieves high density (up to 95% theoretical density) and uniform composition without requiring multiple separate process steps or complex equipment
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 approach achieves a relative density greater than 80% of the theoretical density and significantly reduces surface roughness, enhancing the structural integrity and material properties of the sintered products compared to traditional methods.
Implementation Method 1
sintering the sintering model to form a unitary fused model from the sintering composition
Implementation Method 2
a binder phase distributed throughout the sintering composition
Data Source
AI summary
The disclosure relates to sintering compositions that can be used in three-dimensional printing or additive manufacturing processes. The sintering compositions generally include one or more metallic iron-containing powders and a minor amount of a boron-containing powder as a sintering aid. Sintered models or products formed from the sintering compositions have substantially improved density and surface roughness values relative to models formed without the boron-containing powder.