Sintered Alloy Electrode for Stable Electrical Discharge Coating
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Solution Overview
Problem
The existing electrical discharge surface treatment techniques face instability in discharge generation and coating film formation due to variations in powder shape and size distribution during the production process, affecting the transfer of molten or semi-molten electrode material to the workpiece.
Innovation Solution
The development of an electrode with a sintered body made from Co-base, Ni-base, or Fe-based alloys, featuring a fine powder with a median diameter of 3.0 μm or less and a specific surface area between 0.8 m2/g to 10 m2/g, along with a coarse powder, to ensure stable discharge generation and coating film formation. The electrode is produced through compression molding and sintering in a controlled atmosphere, optimizing electrical resistivity and density for efficient heat retention and discharge stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If raw material powder is refined by pulverization using a jet mill to achieve fine particle size, then the molten or semi-molten electrode material is easily transferred to the workpiece, but the shape and size distribution of the powder are easily affected by environmental changes and process variations
Solution Approach 1:
The patent specifies precise parameter ranges for the sintered body: specific surface area of 0.8-10 m²/g and electrical resistivity of 3-30 mΩ·cm. These parameter controls ensure stable discharge characteristics despite variations in raw powder properties, resolving the contradiction between achieving fine particle size and maintaining discharge stability.
Solution Approach 2:
The electrode uses a composite sintered structure combining fine powder (median diameter ≤3.0 μm) with controlled specific surface area and electrical resistivity properties. This composite approach allows the electrode to maintain stable discharge performance while enabling easy transfer of molten material to the workpiece.
2Reliability
If the specific surface area of the sintered body is increased to improve discharge stability, then the electrode material transfers more easily to the workpiece, but the heat conduction increases which reduces heat retention at the electrode tip
Solution Approach 1:
The patent optimizes the specific surface area to a balanced range of 0.8-10 m²/g. This range is sufficient to ensure stable discharge generation through adequate surface contact area, while preventing excessive heat conduction that would reduce heat retention at the electrode tip. The electrical resistivity is simultaneously controlled at 3-30 mΩ·cm to manage heat generation and retention.
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 approach enables stable discharge generation and consistent coating film formation by maintaining high temperature at the electrode tip, suppressing heat conduction, and ensuring the electrode material remains in a molten or semi-molten state, thereby improving the durability and abrasion resistance of the coating film.
Implementation Method 1
optimizing electrical resistivity and density for efficient heat retention
Implementation Method 2
the molten or semi-molten electrode material is easily transferred to the workpiece during discharges
Implementation Method 3
an electrical resistivity of the sintered body has a value in a range from 3 mΩ·cm to 30 mΩ·cm
Data Source
AI summary
An electrode includes a sintered body made of a powder containing any of a Co-base alloy, a Ni-base alloy, and an Fe-based alloy as the component thereof. The sintered body includes a fine powder having a median diameter of 3.0 μm or less and formed in a scaly shape. A specific surface area of the sintered body has a value in a range from 0.8 m2/g to 10 m2/g. An electrical resistivity of the sintered body has a value in a range from 3 mΩ·cm to 30 mΩ·cm.