Wear-Resistant Element with Metal Core and Ceramic Shell
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Solution Overview
Problem
In comminuting devices like grinding rollers, the high wear of ceramic wear-resistant elements leads to complex and costly maintenance due to the destruction of adhesive connections during heating, resulting in long downtimes and high replacement costs.
Innovation Solution
A wear-resistant element with a metal core and a ceramic shell containing yttrium-stabilized tetragonal polycrystalline zirconium oxide, where the core extends through the wear region, allowing for easy removal and reducing material costs by minimizing the use of expensive ceramic material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic wear-resistant elements are used to increase wear resistance, then wear resistance is improved, but replacement complexity and maintenance cost increase due to destroyed adhesive connections during heating
Solution Approach 1:
The wear-resistant element combines a ceramic shell (yttrium-stabilized tetragonal polycrystalline zirconium oxide) with a metal core. The ceramic shell provides superior wear resistance while the metal core enables simple mechanical removal through drawing, eliminating the need for complex adhesive separation processes during replacement.
Solution Approach 2:
The wear-resistant element is divided into two distinct parts: a ceramic shell for wear protection and a metal core for structural support and removal. This segmentation allows each material to fulfill its optimal function - the ceramic provides wear resistance while the metal facilitates easy replacement through mechanical drawing without damaging adhesive connections.
2Duration of action of stationary object
If ceramic wear-resistant elements are used to extend maintenance intervals, then service life is improved, but material costs increase due to expensive ceramic material
Solution Approach 1:
The composite structure uses expensive ceramic material only for the shell portion that直接接触s wear, while the cheaper metal core provides structural support. This minimizes the overall material cost while maintaining extended maintenance intervals through the wear-resistant ceramic shell.
Solution Approach 2:
Expensive ceramic material is applied locally only to the shell portion where wear resistance is critical, rather than using ceramic throughout the entire element. The metal core replaces ceramic in regions where structural support and ease of removal are more important than wear resistance, reducing overall material costs.
3Strength
If adhesive connections are used to attach wear-resistant elements, then attachment strength is improved, but removal difficulty increases when heating destroys the adhesive
Solution Approach 1:
The invention replaces the chemical bonding mechanism (adhesive) with a mechanical interference fit between the metal core and the base body. This allows the element to be attached strongly during installation and easily removed during maintenance through simple mechanical drawing, eliminating the heating and adhesive separation 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
The solution extends the maintenance intervals and reduces costs by allowing for cost-effective replacement of wear-resistant elements, with the metal core facilitating easy removal and the ceramic shell providing enhanced wear resistance and corrosion resistance.
Implementation Method 1
the shell is formed from a ceramic... the material of the shell comprises a ceramic which contains yttrium-stabilized, tetragonal polycrystalline zirconium oxide (TPZ)... providing enhanced wear resistance and corrosion resistance
Data Source
AI summary
A comminuting device (10) has a wear-resistant element (16) for partial insertion into a recess (26) in the surface of a wear area (12, 14). The wear-resistant element (16) has a fastening region (24), which can be connected to the recess (26) in the surface of the wear area (12, 14), and a wear region (22), which protrudes at least partially from the surface of the wear area (12, 14). The fastening region (24) is formed from a metal, the wear region (22) has a shell (18) and a core (20) arranged inside the shell (18). The core (20) is formed from a metal and the shell (18) is formed from a ceramic (20). The material of the shell comprises a ceramic which contains yttrium-stabilized, tetragonal polycrystalline zirconium oxide (TPZ). The TPZ has a proportion of the ceramic by volume of at least 60%, preferably at least 80%, in particular 95% to 100%.