Boron-Based Amorphous Alloys for High Thermal Stability
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Solution Overview
Problem
There is a lack of reported metalloid B-based amorphous alloys with high thermal stability, high hardness, and high resistivity, which are essential for advanced structural and functional materials in various fields, including new energy, automobiles, and electronics.
Innovation Solution
Development of B-based amorphous alloys with a specific composition formula BaCobREcX1dX2eX3f, where RE includes rare earth elements, and X1, X2, and X3 are selected from specific elements, prepared through a method involving material mixing, master alloy ingot formation, and melt-spinning to produce amorphous ribbons with high thermal stability and hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If metal-based amorphous alloys are used, then excellent mechanical properties and functional properties are achieved, but the thermal stability and hardness are insufficient compared to metalloid-based alloys
Solution Approach 1:
The patent develops B-based amorphous alloys by combining boron (metalloid) with metal elements (Co, Ni, Fe) and rare earth elements (La, Ce, Pr, Nd, Sm, Gd, Dy, Er, Y). This composite approach leverages the high thermal stability and hardness of boron while using metal elements to maintain amorphous forming ability, achieving a balance between thermal stability (Tx > 700°C) and manufacturability through controlled composition ratios
Solution Approach 2:
The patent systematically varies the composition parameters including boron content (45-55 at.%), metal element content (25-40 at.%), and rare earth element content (10-20 at.%) to optimize both thermal stability and amorphous forming ability. By adjusting these parameters within specific ranges, the alloy achieves critical cooling rate requirements for amorphous structure formation while maximizing thermal stability through high boron content
2Temperature
If B content is increased above 50%, then thermal stability and hardness are improved, but the difficulty of forming amorphous structure increases
Solution Approach 1:
Rare earth elements (La, Ce, Pr, Nd, Sm, Gd, Dy, Er, Y) serve as intermediary elements that facilitate amorphous structure formation in high-boron alloys. These elements have large atomic radii and strong bonding characteristics that disrupt crystalline ordering tendencies of boron, enabling amorphous structure formation even at 45-55 at.% boron content while maintaining thermal stability (Tx > 700°C)
Solution Approach 2:
The patent introduces local structural heterogeneity through rare earth element addition, creating regions with different bonding characteristics within the amorphous matrix. This local quality variation prevents long-range crystalline ordering while maintaining short-range order, enabling amorphous structure formation in high-boron compositions and achieving both high thermal stability and manufacturability
3Adaptability or versatility
If Co-B binary alloy system is used, then amorphous structure can be formed in wide composition range, but thermal stability is limited compared to multi-component alloys
Solution Approach 1:
The patent extends the Co-B binary system by adding multiple rare earth elements (La, Ce, Pr, Nd, Sm, Gd, Dy, Er, Y) and optional metal elements (Ni, Fe, Zr, Nb, Mo, Hf, Ta, W) to create multi-component composite alloys. This composite structure maintains the wide amorphous forming range of Co-B system while significantly enhancing thermal stability through strong rare earth-boron bonding and complex multi-element interactions that raise Tx above 700°C
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 B-based amorphous alloys exhibit high thermal stability with an onset temperature of crystallization over 700°C, high Vickers hardness, and high room-temperature resistivity, making them suitable for wear-resistant and corrosion-resistant coatings, and enabling continuous production through efficient melt-spinning techniques.
Implementation Method 1
The currently developed amorphous alloys are mainly based on the metal elements... synthesized a series of Si-based amorphous alloy ribbons by adding transition metals (TM) into an Al—Si—Fe amorphous alloy system with high Si content through a rapid quenching method
Implementation Method 2
Amorphous alloys possess a short-range ordered and long-range disordered atomic arrangement
Implementation Method 3
the mixing enthalpy of Co—B atom pair is more negative than that of Al—Si atom pair. Namely, a strong bonding can be formed between the Co—B atoms, which will be favorable for improving the strength and hardness of the alloys and obtaining better thermal stability
Data Source
AI summary
Boron-based amorphous alloys and a preparation method thereof is provided. The composition formula of the alloys is BaCobREcX1dX2eX3f, wherein RE is any one or more of La, Ce, Pr, Nd, Sm, Gd, Dy, Er and Y; X1 is any one or more of C, Si and Al; X2 is any one or two of Fe and Ni; X3 is any one or more of Zr, Nb, Mo, Hf, Ta and W; and a, b, c, d, e and f respectively represent atomic percent of each corresponding element in the formula, where: 45≤a≤55, 25≤b≤40, 10≤c≤20, 0≤d≤10, 45≤a+d≤55, 0≤e≤20, 25≤b+e≤40, 0≤f≤3, 10≤c+f≤20 and a+b+c+d+e+f=100. The preparation method of the boron-based amorphous alloy comprises: preparing master alloy ingots using an arc furnace or an induction melting furnace; and then obtaining amorphous ribbons with different thicknesses by a single copper roller melt-spinning equipment.