Titanium composite material and titanium material for hot working
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Solution Overview
Problem
The high production cost of titanium alloys due to the use of scarce and expensive platinum group elements, combined with issues related to formability, oxidation resistance, and hydrogen embrittlement, limits the cost-effective production of titanium materials with desired characteristics such as corrosion resistance, fatigue resistance, and neutron blocking properties.
Innovation Solution
A titanium composite material is developed with a surface layer portion consisting of a titanium alloy and an inner layer portion of commercially pure titanium, where the surface layer portion contains platinum group elements, rare earth elements, Co, and Ni, and the inner layer portion has porosity, reducing the overall content of expensive alloying elements and lowering production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platinum group elements are added to titanium to improve corrosion resistance, then corrosion resistance is improved, but production cost increases significantly
Solution Approach 1:
The patent applies local quality by creating a surface layer portion containing platinum group elements (0.01-0.25% mass%) on the titanium material surface, while the inner layer contains minimal or no platinum group elements. This localized alloying provides corrosion resistance where it is most needed (at the surface exposed to corrosive environments) while minimizing the overall content of expensive alloying elements, thereby reducing production cost while maintaining reliability.
2Strength
If alloying elements are added to improve high temperature strength, then high temperature strength is improved, but oxidation resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ranges of alloying elements: Al (0.5-2.3% mass%), Si (0.1-1.0% mass%), Fe (0.04-0.2% mass%), O (0.02-0.15% mass%), and Pt group elements (0.01-0.25% mass%). These optimized parameters enable the surface layer to achieve both high temperature strength improvement through Al and Si additions while maintaining oxidation resistance through controlled Fe and O content, and the protective effect of Pt group elements at the surface.
3Reliability
If the thickness of surface layer portion is increased to improve corrosion resistance, then corrosion resistance is improved, but material cost increases
Solution Approach 1:
The patent optimizes the thickness of the surface layer portion to 2 μm or more but limits its proportion to 40% or less of the overall thickness. This creates a thin surface layer with high Pt group element concentration (0.01-0.25% mass%) that provides sufficient corrosion resistance for the exposed surface, while the bulk of the material (inner layer) uses minimal or no Pt group elements, significantly reducing the overall material cost while maintaining reliability.
4Reliability
If expensive alloying elements are used to improve neutron blocking properties, then neutron blocking properties are improved, but production cost increases
Solution Approach 1:
The patent applies local quality by concentrating neutron-blocking alloying elements (such as Pt group elements and rare earth elements) in the surface layer portion where they can provide radiation shielding for the functional surface, while minimizing their content in the inner layer. This localized distribution achieves the required neutron blocking properties for the application while minimizing the overall quantity of expensive alloying elements used, thereby reducing production cost.
Data Source
AI summary
Provided is a titanium composite material 1 including: a first surface layer portion 2; an inner layer portion 4; and a second surface layer portion 3; wherein: the first surface layer portion 2 and the second surface layer portion 3 are composed of a titanium alloy; the inner layer portion 4 is composed of a commercially pure titanium including pores; a thickness of at least one of the first surface layer portion 2 and the second surface layer portion 3 is 2 μm or more, and a proportion of the thickness with respect to an overall thickness of the titanium composite material 1 is 40% or less; and a porosity in a cross section perpendicular to a sheet thickness direction is more than 0% and 30% or less.