Ti-Zr Alloy Powder for Capacitor Anodes
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Solution Overview
Problem
Current materials like tantalum and niobium used in capacitor anodes have limitations such as high cost and leakage issues, while titanium oxide has a high dielectric constant but struggles with leakage at high voltages, necessitating the development of titanium-zirconium alloys with improved properties.
Innovation Solution
A titanium-zirconium alloy powder with a solid solution structure, dendritic or nodular shape, and controlled atomic ratios, optionally with a Ti-Zr oxide layer and phosphorus, is used to form sintered pellets and capacitor anodes, addressing leakage and cost concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If titanium oxide is used as capacitor electrode material, then dielectric constant is improved, but leakage current increases at high voltages
Solution Approach 1:
The patent applies composite materials by creating a Ti-Zr alloy system where titanium and zirconium are combined in specific atomic ratios (30-70 at% Ti, 70-30 at% Zr). This composite approach leverages the high dielectric constant of titanium oxide while zirconium contributes to reduced leakage current, achieving a balance between the two contradictory properties through material composition optimization.
Solution Approach 2:
The patent employs parameter changes by systematically varying the atomic composition ratio of Ti and Zr within specific ranges (30-70 at% Ti, 70-30 at% Zr) and controlling particle size parameters (5-50 micrometers). These parameter optimizations enable tuning of the material's electrical properties to simultaneously achieve high dielectric constant and low leakage current.
2Reliability
If pure titanium is used as capacitor electrode material, then dielectric constant and sinterability are improved, but leakage current control deteriorates
Solution Approach 1:
The patent applies composite materials by creating a Ti-Zr alloy system where titanium and zirconium are combined in specific atomic ratios (30-70 at% Ti, 70-30 at% Zr). This composite approach leverages the high dielectric constant of titanium oxide while zirconium contributes to reduced leakage current, achieving a balance between the two contradictory properties through material composition optimization.
3Reliability
If tantalum and niobium are used as capacitor anode materials, then capacitance performance is improved, but cost increases
Solution Approach 1:
The patent applies this principle by replacing expensive rare metals (tantalum and niobium) with more abundant and cost-effective titanium and zirconium alloys. The Ti-Zr alloy maintains functional performance for capacitor anodes while significantly reducing material cost, making the capacitor manufacturing more economically viable without sacrificing essential capacitance performance.
Solution Approach 2:
The patent employs parameter changes by optimizing the atomic composition ratio of Ti and Zr (30-70 at% Ti, 70-30 at% Zr) and particle size (5-50 micrometers) to achieve capacitance performance comparable to tantalum and niobium-based materials. This parameter optimization enables cost-effective alternative materials to meet performance requirements.
4Ease of manufacture
If titanium powder is used as capacitor anode material, then cost is reduced, but leakage current increases
Solution Approach 1:
The patent applies composite materials by creating a Ti-Zr alloy system where titanium and zirconium are combined in specific atomic ratios (30-70 at% Ti, 70-30 at% Zr). This composite approach leverages the high dielectric constant of titanium oxide while zirconium contributes to reduced leakage current, achieving a balance between the two contradictory properties through material composition optimization.
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 titanium-zirconium alloy powder enables the formation of capacitor anodes with controlled leakage and enhanced capacitance, overcoming the limitations of traditional materials by providing a cost-effective solution with improved electrical properties.
Implementation Method 1
a titanium-zirconium (Ti—Zr) alloy powder... that is a solid solution of titanium and zirconium
Implementation Method 2
utilized in the formation of sintered pellets
Data Source
AI summary
A Ti—Zr alloy in powder form is described. Sintered pellets containing the Ti—Zr alloy powder of the present invention, as well as capacitor anodes, are further described.