Mixed Metal Oxide Powder Pyrolysis With Jet-Milled Precursors
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Solution Overview
Problem
Current methods for manufacturing mixed metal oxides are time-consuming, labor-intensive, and prone to introducing impurities, with additional post-treatment steps often required to achieve desired particle size and crystallinity.
Innovation Solution
A pyrolytic method involving mixing metal precursors in a solvent, drying, jet milling to achieve spherical particles, and exposing them to a hydrocarbon flame or oxygen plasma for rapid conversion to complex metal oxide powders without additional annealing or calcination steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid state method or wet chemical methodologies are used to manufacture mixed metal oxides, then the desired mixed metal oxide product is obtained, but the process involves multiple steps and laborious operations resulting in lower yields and batch-wise inconsistencies
Solution Approach 1:
The patent combines multiple separate process steps (mixing, drying, milling, and pyrolysis) into a single integrated pyrolytic processing step. The metal precursor mixture is subjected to pyrolysis in one operation that simultaneously achieves decomposition, oxidation, and formation of the mixed metal oxide product, eliminating the need for separate annealing or calcination steps and thereby improving consistency while reducing process complexity.
Solution Approach 2:
The patent performs preliminary mixing and drying of metal precursors to form a homogeneous precursor mixture before pyrolysis. This preliminary preparation ensures uniform distribution of metal elements, which then undergo simultaneous reaction during pyrolysis to produce consistent mixed metal oxide products without requiring subsequent batch-wise adjustments or post-treatment steps.
2Manufacturing precision
If flame pyrolysis or electric furnace pyrolysis techniques are used, then mixed metal oxides are produced, but additional post-treatment annealing step is required to achieve desired particle size and crystallinity
Solution Approach 1:
The patent merges the pyrolysis process with particle formation and crystallization steps into a single operation. By controlling the pyrolysis conditions (temperature, atmosphere, residence time), the process simultaneously achieves precursor decomposition, oxide formation, desired particle size, and appropriate crystallinity, eliminating the need for separate post-treatment annealing steps and reducing total processing time.
3Productivity
If plasma oxidation of liquid precursor droplets is used, then mixed metal oxide nanoparticles are produced, but operational issues arise involving handling large amounts of liquid evaporation and quenching of plasma torches
Solution Approach 1:
The patent replaces the liquid precursor delivery system with a solid precursor handling system. Instead of using liquid precursor droplets that require evaporation management and plasma torch quenching, the invention uses solid metal precursor mixtures that are fed directly into the pyrolysis zone, eliminating operational issues related to liquid handling while maintaining high production efficiency.
4Manufacturing precision
If liquid phase precursors are used in flame or plasma methods, then porous lighter nano powders are produced, but lower control on size is achieved and additional post-treatment calcination step is required
Solution Approach 1:
The patent changes the physical state parameter of the precursors from liquid to solid form. This parameter change enables better size control during pyrolysis because solid precursors maintain their particulate structure throughout the process, allowing direct formation of desired particle sizes without requiring additional calcination steps, while simplifying the overall manufacturing process.
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
This method reduces processing time and energy consumption, achieves precise control over particle size and composition, and eliminates the need for post-treatment, resulting in efficient and scalable production of mixed metal oxide powders with improved energy efficiency and cost-effectiveness.
Implementation Method 1
the particles are heated at a rate of 500-3000° C. per minute
Implementation Method 2
the uniform dispersion is dried to obtain a dried mixed metal precursor powder
Implementation Method 3
the uniform dispersion is jet milled to obtain spherical aggregated particles
Implementation Method 4
the spherical aggregated particles of the dried mixed metal precursor powder are exposed to a hydrocarbon flame or oxygen plasma
Implementation Method 5
the particles are exposed to an atmospheric pressure microwave plasma, radio frequency plasma torch, or any other form of plasma excitation
Data Source
AI summary
A method of manufacturing a mixed metal oxide powder is provided. The method includes steps of mixing two or more metal precursors in a solvent to form a dispersion of the metal precursors in the solvent; drying the dispersion to obtain a dried mixed metal precursor powder; jet milling the dried mixed metal precursor powder to obtain particles having a size distribution in a range of 0.2-20 micrometers; and exposing the particles to a hydrocarbon flame or oxygen plasma to provide the mixed metal oxide powder. Mixed metal oxide powders produced by the disclosed methods are also provided.