Particulate Titanium Alloy Co-Reduction for Lower-Cost Production
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Solution Overview
Problem
The high cost and energy-intensive nature of conventional methods for producing titanium and titanium alloys, along with the difficulty in achieving homogeneous alloys in large quantities, necessitates a more economical and simplified production process.
Innovation Solution
A solid state alloying process involving the co-reduction of a composite particulate oxide mixture of TiO2 powder and alloying element powders using a metallic reducing agent under a hydrogen atmosphere, followed by heat treatment and deoxygenation to produce a particulate titanium alloy product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional carbothermal reduction or metallothermic reduction processes (Kroll and Hunter processes) are used to produce titanium, then titanium can be manufactured commercially, but the production cost becomes twenty times more expensive than steel production
Solution Approach 1:
The patent changes the chemical parameters of the reduction process by using aluminum as a reducing agent instead of traditional carbothermal or metallothermic methods. The process operates at lower temperatures (800-1000°C) compared to conventional methods, and uses a different chemical reaction pathway (aluminothermic reduction) that reduces both energy consumption and material costs, thereby making titanium production more economically viable
Solution Approach 2:
The patent replaces the complex multi-step mechanical and chemical processes of conventional titanium production (including chloride formation, reduction, and purification steps) with a simplified direct aluminothermic reduction process that converts titanium oxide directly to titanium metal in a single reduction step, eliminating multiple processing stages and associated costs
2Reliability
If conventional carbothermal reduction or metallothermic reduction processes are used to produce titanium, then titanium can be manufactured commercially, but the energy input becomes extremely high
Solution Approach 1:
The patent changes the thermal parameters of the reduction process by operating at lower temperatures (800-1000°C) compared to conventional methods that require much higher temperatures. The aluminothermic reaction is self-heating, reducing the external energy input required, and the process completes in a single stage rather than multiple heating and cooling cycles, thereby dramatically reducing total energy consumption
3Manufacturing precision
If VAR process is used to produce titanium alloys from titanium sponge and master alloy, then homogeneous alloy materials can be obtained, but the process requires multiple cycles with substantial energy input and time consumption
Solution Approach 1:
The patent performs preliminary alloying during the reduction process itself by mixing aluminum powder with titanium oxide and other metal oxides before reduction. This preliminary combination of elements occurs at the powder level, ensuring homogeneous distribution of alloying elements before the actual metal formation, thereby eliminating the need for subsequent remelting and rehomogenization cycles
Solution Approach 2:
The patent merges multiple process steps into a single integrated operation: the reduction of titanium oxide, the alloying with other metal elements, and the formation of homogeneous alloy structure all occur simultaneously in one aluminothermic reduction reaction, rather than as separate sequential steps requiring multiple cycles
4Manufacturing precision
If VAR process is used to produce titanium alloys, then high purity titanium alloys can be obtained, but the process requires cyclic loading and substantial energy input
Solution Approach 1:
The patent performs preliminary purification by selecting high-purity starting materials (titanium oxide and metal oxide powders with controlled purity levels) and performing the reduction in a controlled atmosphere. This preliminary preparation ensures that impurities are minimized from the start, eliminating the need for multiple purification cycles and associated energy consumption
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 reduces production costs and energy input while achieving high-purity, homogeneous titanium alloys with low residual oxygen content, suitable for various industrial applications.
Implementation Method 1
co-reducing the composite particulate oxide mixture using a metallic reducing agent under a full or partial hydrogen atmosphere at a reducing temperature for a reduction time sufficient to produce a hydrogenated titanium alloy product
Implementation Method 2
produce a hydrogenated titanium alloy product
Implementation Method 3
heat treating the hydrogenated titanium alloy product under a hydrogen atmosphere and a heat treating temperature sufficient to reduce pore size and specific surface area
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
A method (100) for producing a particulate titanium alloy product can include preparing (110) a composite particulate oxide mixture with TiO2 powder and at least one alloying element powder. The composite particulate oxide mixture can be co-reduced (120) using a metallic reducing agent under a hydrogen atmosphere at a reduction temperature for a reduction time sufficient to produce a hydrogenated titanium alloy product. The hydrogenated titanium alloy product can then be heat treated (130) under a hydrogen atmosphere and a heat treating temperature to reduce pore size and specific surface area to form a heat treated hydrogenated titanium product. The heat treated hydrogenated titanium product can be deoxygenated (140) to reduce residual oxygen to less than 0.2 wt% to form a deoxygenated hydrogenated titanium product as a particulate. The deoxygenated hydrogenated titanium product can optionally be dehydrogenated (150) to form the titanium alloy product as a particulate.