Titanium Palladium Alloy for Lightweight Watch Components
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Solution Overview
Problem
Current watchmaking alloys are either too heavy due to high density or lack the necessary ductility and formability, making it challenging to create lightweight, valuable, and corrosion-resistant components for jewelry and timepieces.
Innovation Solution
Development of ternary alloys based on titanium, palladium, and niobium, with specific compositions that replace palladium and gold with non-precious elements like iron, niobium, and chromium, maintaining ductility and reducing the precious metal content while minimizing additional costs and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional precious alloys are used, then the item has high value and corrosion resistance, but the density is too high (>10 g/cm³)
Solution Approach 1:
The patent uses composite materials by combining titanium with precious metals (palladium, gold, or platinum) to create a hybrid alloy that leverages the low density of titanium while incorporating the corrosion resistance and value of precious metals. This resolves the contradiction by achieving both lightweight properties and reliability through material composition rather than using traditional dense precious alloys alone.
Solution Approach 2:
The patent changes the compositional parameters of the alloy by strictly limiting precious metal content to ≤50% by mass and controlling titanium content (≥40% for Pd alloys, ≥30% for Au/Pt alloys), while adding specific amounts of Fe (0.1-10%), Nb (0.1-10%), and Cr (0.1-5%). These parameter changes enable the alloy to achieve both low density and adequate corrosion resistance by optimizing the balance between lightweight and protective elements.
2Weight of moving object
If lightweight materials like titanium are used, then the density is reduced, but the ductility and formability are insufficient
Solution Approach 1:
The patent modifies the compositional parameters by adding specific alloying elements (Fe: 0.1-10%, Nb: 0.1-10%, Cr: 0.1-5%) to pure titanium. These parameter changes fundamentally alter the material's mechanical properties, transforming titanium from a less ductile material into one with adequate formability and ductility for jewelry manufacturing, while maintaining its lightweight advantage.
Solution Approach 2:
The patent creates a composite alloy system where titanium is combined with precious metals and alloying elements. This composite structure synergistically combines titanium's low density with the beneficial mechanical properties contributed by the alloying elements, achieving both lightweight characteristics and manufacturability that pure titanium alone cannot provide.
3Reliability
If precious metal content is increased to ensure value, then the title is improved, but the cost and weight increase
Solution Approach 1:
The patent optimizes the precious metal content parameter by capping it at ≤50% by mass, which is sufficient to achieve the desired legal titles (500 for Pd, 750 for Au, 900 for Pt) while minimizing weight. This parameter optimization ensures the item meets value requirements without the excessive weight that would result from higher precious metal concentrations.
Solution Approach 2:
The patent replaces a portion of expensive precious metals with cheaper alloying elements (Fe, Nb, Cr) that provide structural and mechanical benefits. This substitution reduces both cost and weight while maintaining the necessary precious metal content for achieving legal titles, effectively using less expensive materials to accomplish the same functional and aesthetic goals.
4Ease of manufacture
If alloying elements are added to improve formability, then the ductility is enhanced, but the shape memory effect is introduced
Solution Approach 1:
The patent carefully controls the concentration parameters of alloying elements, particularly limiting Fe to 0.1-10% and Nb to 0.1-10%, which is sufficient to improve formability but below the thresholds that would trigger significant shape memory effects. This precise parameter control achieves the desired balance between manufacturability and elimination of unwanted shape memory properties.
Solution Approach 2:
The patent applies partial action by adding alloying elements in moderate, controlled amounts rather than excessive quantities. This partial addition is sufficient to achieve the necessary formability improvements while remaining below the concentration thresholds that would induce shape memory effects, thereby achieving the optimal balance without over-alloying.
Data Source
Figure 1~2
AI summary
An external component (1) for a timepiece or jewellery item, made from lightweight precious alloy comprising titanium and palladium, in the atomic composition TiaPdbMcTd, in which a, b, c and d are atomic fractions of the total, such that a+b+c+d= 1, - a being between 0.44 and 0.55, - b being between 0.30 and 0.45, - c being between 0.04 and 0.24, - d being between 0.001 and 0.03, - in which said alloy comprises, at most, two metals M, chosen from Nb, V, Fe, Co, Au and Pt, - in which each trace of metal T has an atomic proportion of less than 3.0% of the total of said alloy, chosen from Nb, V, Mo, Ta, W, Fe, Co, Ni, Ru, Rh, Ir, Au, Pt, Cr, Mn, Cu, Zn, Ag, Al, B, Si, Ge, Sn, Sb and In, - said alloy comprising at least 0.05% boron, and comprising at least 50% by weight of palladium.