Sintered Titanium Components via Additive Manufacturing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional processes for producing high-performance titanium materials, such as wrought processing, are energy-intensive and limited to simple geometries, making them unsuitable for widespread commercial applications due to high energy requirements and material loss, while current additive manufacturing methods fail to achieve properties comparable to machined or wrought titanium products.
Innovation Solution
A method involving additive manufacturing to form a green body using a titanium powder bed with a binder, followed by sintering in a hydrogen atmosphere, phase transformation, and dehydrogenation to produce densified sintered titanium articles with controlled microstructure and properties, including fine grain size and low oxygen content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional wrought processing is used to produce titanium materials, then high strength and good ductility are achieved, but energy consumption is high and material loss increases
Solution Approach 1:
The patent changes the processing parameters by using additive manufacturing followed by sintering at specific temperatures (900-1100°C) and controlled cooling rates, replacing the traditional wrought processing parameter set. This achieves comparable mechanical properties with significantly reduced energy consumption by eliminating high-energy thermomechanical processing steps
Solution Approach 2:
The patent replaces the mechanical wrought processing system with an additive manufacturing and sintering system. Instead of mechanical deformation and forming operations, the invention uses layer-by-layer powder deposition followed by thermal sintering, thereby reducing energy consumption while maintaining product performance
2Strength
If traditional wrought processing is used to produce titanium materials, then high strength is achieved, but geometric complexity is limited to simple shapes
Solution Approach 1:
The patent performs preliminary geometric shaping through additive manufacturing before sintering, creating complex near-net-shape components that require minimal post-processing. This preliminary formation of complex geometries eliminates the need for extensive machining and forming operations that would compromise both strength and geometric fidelity
Solution Approach 2:
The patent changes the manufacturing approach from mechanical forming to additive manufacturing with controlled sintering, enabling the production of complex geometries while maintaining material strength through optimized sintering parameters and microstructure control
3Shape
If additive manufacturing is used to produce titanium components, then geometric complexity is improved and energy consumption is reduced, but material density and mechanical properties are insufficient
Solution Approach 1:
The patent applies specific sintering parameters including temperature (900-1100°C), atmosphere control, and cooling rates to transform the microstructure of additively manufactured titanium components. These parameter changes achieve full densification and controlled microstructures that provide tensile strength comparable to wrought materials
Solution Approach 2:
The patent utilizes phase transitions during sintering and cooling to control microstructure development. By controlling the transformation of titanium phases during thermal processing, the invention achieves fine-grained microstructures with high strength while maintaining the geometric complexity enabled by additive manufacturing
4Use of energy by moving object
If additive manufacturing is used to produce titanium components, then energy consumption is reduced and geometric complexity is improved, but material density is insufficient
Solution Approach 1:
The patent employs optimized sintering parameters including temperature, time, and atmosphere control to achieve full densification of additively manufactured titanium components. These parameter changes eliminate porosity and achieve theoretical density without requiring additional high-energy processing steps
Solution Approach 2:
The patent utilizes phase transitions during sintering to promote densification. The controlled thermal processing induces phase transformations that drive pore elimination and achieve full density, thereby resolving the density deficiency of additively manufactured components while maintaining energy efficiency
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
This method achieves near-full density and high tensile strength titanium materials with ultrafine grain sizes and low impurity levels, comparable to machined or wrought titanium products, while reducing energy consumption and enabling complex geometries, thus overcoming the limitations of traditional processes.
Implementation Method 1
The debinded titanium article can be sintered at a sintering temperature in an atmosphere that includes hydrogen
Implementation Method 2
The sintered titanium article can be held at a phase transformation temperature to form a microstructure-controlled titanium article
Implementation Method 3
The microstructure-controlled titanium article can be dehydrogenated to form a densified sintered titanium article
Data Source
AI summary
A method of making a densified sintered titanium article includes forming a powder bed of a titanium feedstock. A binder is applied to a portion of the powder bed to bind the titanium feedstock together, thereby forming a green body. The green body is debinded to remove at least a portion of the binder to form a debinded titanium article. The debinded titanium article is sintered at a sintering temperature in an atmosphere comprising hydrogen to produce a sintered titanium article. The sintered titanium article is held at a phase transition temperature to form a microstructure-controlled titanium article. The microstructure-controlled titanium article is dehydrogenated to form a densified sintered titanium article.