Titanium Sintered Body Specularity and Weather Resistance
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Solution Overview
Problem
Titanium sintered bodies produced by powder metallurgy often have low surface smoothness and specularity due to reflecting the properties of the starting material powder, leading to appearance issues and poor weather resistance, especially when exposed to harsh environments.
Innovation Solution
A titanium sintered body with a specific composition and microstructure, containing both α-phase and β-phase titanium with controlled grain size and area ratios, along with stabilizing elements, to enhance mechanical properties and maintain high specularity over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a titanium sintered body is produced by a powder metallurgy method to achieve a shape close to the final shape, then productivity is improved and secondary processing can be omitted, but the surface smoothness decreases and specularity is poor
Solution Approach 1:
The patent applies parameter changes by precisely controlling the grain size (3-30 μm) and area ratio (80-98% α-phase, 2-20% β-phase) of the crystal phases, as well as controlling the aspect ratio of α-phase grains (1-3). These parameter optimizations enable the sintered body to achieve high specularity while maintaining the productivity benefits of powder metallurgy near-net shaping.
Solution Approach 2:
The patent creates a composite microstructure consisting of α-phase and β-phase titanium with specific proportions and characteristics. This composite phase structure leverages the complementary properties of both phases to achieve both high specularity and mechanical strength, resolving the contradiction between production efficiency and surface quality.
2Manufacturing precision
If iron powder and molybdenum powder are added to titanium powder to achieve specularity, then the surface appearance is improved, but weather resistance deteriorates
Solution Approach 1:
The patent uses parameter changes by establishing specific compositional ranges: titanium content of 97.0-99.5 wt%, aluminum of 0.5-3.0 wt%, and vanadium of 0.5-2.0 wt%. This optimized composition achieves high specularity through controlled phase morphology while maintaining excellent weather resistance by using corrosion-resistant alloying elements instead of iron.
Solution Approach 2:
The patent discards the harmful iron additive approach from prior art and recovers/adopts a titanium-based alloying system with aluminum and vanadium. This replacement eliminates the weather resistance problem while preserving the specularity benefit, as the new alloying elements provide both aesthetic and protective functions.
3Manufacturing precision
If the area ratio of α-phase is increased to improve specularity, then surface appearance is enhanced, but the mechanical strength may be compromised
Solution Approach 1:
The patent applies parameter changes by optimizing multiple interrelated parameters simultaneously: α-phase area ratio (80-98%), β-phase area ratio (2-20%), α-phase grain size (3-30 μm), and aspect ratio (1-3). This multi-parameter optimization ensures that the high α-phase content needed for specularity does not compromise strength, as the controlled β-phase presence and grain morphology maintain mechanical integrity.
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 sintered body achieves improved surface smoothness, high specularity, and excellent weather resistance, maintaining aesthetic appearance and mechanical integrity for a long period.
Implementation Method 1
a titanium sintered body having a shape close to the final shape can be easily produced
Data Source
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AI summary
A titanium sintered body contains an α-phase and a β-phase as crystal structures, wherein the average grain size of the α-phase in a cross section is 3 µm or more and 30 µm or less, and an area ratio occupied by the α-phase in a cross section is 70% or more and 99.8% or less. In the titanium sintered body, it is preferred that the average aspect ratio of the α-phase in a cross section is 1 or more and 3 or less. It is also preferred that the titanium sintered body contains titanium as a main component, and also contains an α-phase stabilizing element and a β-phase stabilizing element.