Frustocone Annular Oxide Body Compaction to Reduce Cracking
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Solution Overview
Problem
Existing processes for producing annular oxidic shaped bodies by mechanical compaction result in fragile products with high crack formation due to limited interparticulate binding forces, leading to fracture during thermal treatment and increased pressure drop in catalytic reactions.
Innovation Solution
Modifying the geometry of the shaped precursor body to a frustocone shape, which reduces rollering friction between the die bore and the precursor body, allowing for improved mechanical compaction and thermal treatment without significant impact on pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical compaction is used to produce annular oxidic shaped bodies, then the precursor bodies can be formed with residual interparticulate bonds, but the precursor bodies become fragile with high crack formation leading to fracture during thermal treatment
Solution Approach 1:
The patent changes the geometric parameters of the die bore, specifically introducing a frustoconic section with defined angles (α and β) and dimensional relationships (L1, L2, R1, R2) to optimize the compaction process and reduce crack formation while maintaining manufacturing feasibility
Solution Approach 2:
The patent applies curved surfaces by using a frustoconic section instead of a cylindrical die bore, creating a tapered geometry that eliminates rollering friction and improves the mechanical integrity of the precursor body during compaction and thermal treatment
2Strength
If the precursor body geometry is modified to frustocone shape, then crack formation is reduced and mechanical integrity is enhanced, but the production process complexity increases
Solution Approach 1:
The die bore incorporates a frustoconic section with specific geometric parameters (angles α and β, dimensions L1 and L2) that provides curved surfaces to eliminate friction and enhance mechanical integrity, while the geometry is designed to be manufacturable with standard engineering tolerances
3Device complexity
If conventional cylindrical die bore is used, then the production process is simple, but rollering friction occurs between die bore and precursor body causing crack formation
Solution Approach 1:
The patent replaces the cylindrical die bore with a frustoconic section that has tapered walls, eliminating the rollering friction contact between the die bore and precursor body by creating a geometry where the precursor body slides rather than rolls during compaction, thereby reducing crack formation
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 frustocone geometry significantly reduces fracture and maintains the pressure drop advantage, enhancing the integrity and performance of annular oxidic shaped bodies in catalytic applications.
Implementation Method 1
mechanical compaction of a pulverulent aggregate which has been introduced into the fill chamber of a die
Implementation Method 2
thermal treatment of the ringlike shaped precursor body at a temperature of ≧100° C., in which at least a portion of its constituents is decomposed and/or converted chemically
Implementation Method 3
at least a portion of its constituents is decomposed and/or converted chemically to form at least one gaseous compound
Data Source
AI summary
A process for producing a ringlike oxidic shaped body by mechanically compacting a pulverulent aggregate introduced into the fill chamber of a die, wherein the outer face of the resulting compact corresponds to that of a frustocone.