Stable-Phase Crystal Production by Additive-Free Physical Grinding
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Solution Overview
Problem
Existing methods for transforming metastable phase crystals into stable phase crystals often require additives that can introduce impurities, making it difficult to achieve high-purity stable phase crystals.
Innovation Solution
A physical grinding process is used to transform metastable phase crystals into stable phase crystals without the use of additives, utilizing inert solid grains to reduce the crystal grain size to 1 μm or less, preferably using glass or zirconia beads at specific rotation speeds and times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If additives or other solvents are used to promote phase transformation, then the phase transformation is facilitated, but impurities are introduced into the crystal
Solution Approach 1:
The patent removes chemical additives from the phase transformation process entirely, using only physical grinding with inert solid grains. This extraction of harmful chemical substances resolves the contradiction by achieving phase transformation without introducing impurities, as the inert grains do not chemically interact with the crystal structure.
Solution Approach 2:
The patent replaces chemical methods (additives/solvents) with a physical mechanical system (grinding with inert solid grains). The mechanical action of grinding induces phase transformation through physical means rather than chemical means, thereby avoiding contamination while maintaining transformation efficiency.
2Speed
If chemical additives are used to promote phase transformation, then the transformation process is accelerated, but the crystal compound is contaminated
Solution Approach 1:
The patent converts the potentially harmful effect of mechanical stress (which could damage crystals) into a beneficial phase transformation mechanism. The grinding process applies controlled mechanical force that induces phase transformation without chemical contamination, turning a physical stressor into a useful transformation driver.
Solution Approach 2:
The patent uses inert solid grains as a physically inert environment for the phase transformation. These grains do not chemically interact with the crystal or solvent, creating a contamination-free zone where phase transformation can occur without introducing harmful substances, similar to how an inert atmosphere prevents chemical reactions.
3Manufacturing precision
If physical grinding is used to reduce grain size, then the phase transformation is promoted, but the process time is extended
Solution Approach 1:
The patent optimizes grinding parameters (grain size reduction to 1 μm or less, rotation speed of 200-300 rpm, duration of 24-48 hours) to achieve efficient phase transformation. By carefully controlling these parameters, the process achieves the desired grain size reduction and phase transformation within a reasonable time frame, balancing precision and efficiency.
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 enables efficient and stable phase transformation, producing high-purity stable phase crystals suitable for fields requiring high product purity, such as fine chemistry and pharmaceuticals.
Implementation Method 1
a physical grinding process of a metastable phase crystal... a grain size of the metastable phase crystal may be ground to 1 μm or less
Implementation Method 2
a change from a metastable phase crystal into a stable phase crystal is called a phase transformation... the metastable phase crystals are re-precipitated as stable phase crystals through a phase transformation
Implementation Method 3
the metastable phase crystals are first precipitated by Ostwald's Rule of Stage, and then the metastable phase crystals are re-precipitated as stable phase crystals through a phase transformation
Data Source
AI summary
The present disclosure relates to a method for producing stable phase crystals using physical grinding, and specifically, to a method for efficiently and stably phase-transforming a metastable phase crystal into a stable phase crystal without using chemicals such as additives for promoting the phase transformation from the metastable phase crystal into the stable phase crystal.