PCD Cutter Sensor Integration via Insulated Joining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polycrystalline diamond (PCD) cutter elements used in machine tools, particularly earth-boring drill bits, face challenges in integrating sensors due to high temperatures and abrasive conditions, making it difficult to assess their working condition in situ during drilling.
Innovation Solution
A composite product is created by joining an electronic device to a PCD body using metallic join material with a liquidus temperature of 600° C. to 950° C., ensuring electrical insulation between the electronic component and the PCD proximal boundary to prevent short-circuiting, and using an electrically insulating PCD portion to maintain an open circuit condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are integrated into PCD cutter elements for in situ monitoring, then measurement capability is improved, but electrical short-circuiting occurs due to the electrically conducting PCD material
Solution Approach 1:
The PCD body is segmented into electrically conducting and electrically insulating portions. The electrically insulating PCD portion acts as a spatial separator that divides the conducting PCD material into distinct regions, preventing electrical short-circuits while allowing sensor integration for condition monitoring.
Solution Approach 2:
The electrically insulating PCD portion serves as an intermediary element between electrically conducting components. This intermediary material enables electrical isolation while maintaining structural integrity and mechanical connection between different parts of the cutter element.
2Strength
If high temperature brazing is used to join electronic devices to PCD, then bonding strength is improved, but PCD material degradation occurs due to graphitisation above 950° C.
Solution Approach 1:
The liquidus temperature parameter of the metallic join material is specifically selected to be between 600° C. and 950° C. This parameter change enables strong bonding while maintaining PCD structural integrity by preventing graphitisation that occurs above 950° C.
Solution Approach 2:
The joining process utilizes the phase transition of the metallic join material from solid to liquid and back to solid. The material melts at controlled temperatures below 950° C. to achieve strong bonding, then solidifies to form a robust joint without exposing PCD to degradation temperatures.
3Strength
If the PCD body is made entirely electrically conducting for structural integrity, then mechanical strength is improved, but electrical insulation capability deteriorates
Solution Approach 1:
Different regions of the PCD body are assigned different electrical properties. The electrically insulating PCD portion provides local electrical isolation where needed, while other regions maintain electrical conductivity for structural integrity and signal transmission. This local differentiation resolves the contradiction between overall strength and localized insulation.
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
Enables the integration of sensors with PCD cutting tools, allowing for in situ condition monitoring and extending the working life of PCD materials by preventing electrical short-circuits and maintaining the integrity of the PCD material under high-temperature conditions.
Implementation Method 1
heating the metallic join material to a temperature of at least the liquidus temperature and no greater than 950° C., to allow the metallic join material to melt and connect the body and the device surface; and allowing the metallic join material to cool and solidify, to form the connection portion
Implementation Method 2
metallic join material having a liquidus temperature of 600° C. to 950° C. at atmospheric pressure, and capable of chemically bonding to the PCD material and the device surface
Implementation Method 3
at least one of the electronic device and the PCD body including an electrically insulating portion between the electronic component and the PCD proximal boundary establishing an electrical open circuit condition between the electronic component and the PCD proximal boundary
Data Source
AI summary
A composite product has a body of polycrystalline diamond (PCD) material having a PCD proximal end and a PCD distal end, an electronic device including an electronic component, and a connection portion joining the electronic device to the body at the PCD distal end, and comprising metallic join material having a liquidus temperature of 600° C. to 950° C. at atmospheric pressure. At least one of the electronic device and the body includes an electrically insulating portion between the electronic component and the PCD proximal boundary establishing an electrical open circuit condition between the electronic component and the PCD proximal boundary. A method of making the composite product is also disclosed.