Large-Size Diamond MPCVD Device With Microwave-Shielded Windows
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing MPCVD devices suffer from microwave leakage at the observation window and cavity door sealing, and lack the ability to monitor and optimize process parameters during diamond growth, leading to poor quality in mass-produced diamonds.
Innovation Solution
An MPCVD device with composite windows, pressure sensors, thickness and temperature measuring devices, and a plasma diagnostic device, coupled with an expert optimization system using artificial neural networks and genetic algorithms, to monitor and optimize diamond growth parameters in real time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an O-shaped sealing ring is arranged at the connection between the baseplate and the upper cover plate, then the sealing of the cavity door opening is improved, but microwave leakage occurs at the observation window and the ability to monitor process parameters is lost
Solution Approach 1:
The patent uses a composite window structure combining quartz material and microwave absorbing material. The quartz portion allows optical observation while the microwave absorbing material layer prevents microwave leakage, creating a composite solution that addresses both sealing reliability and microwave leakage issues simultaneously
Solution Approach 2:
The patent introduces a microwave absorbing material as an intermediary substance between the sealing requirements and microwave transmission. This intermediary material absorbs microwaves while allowing the sealing structure to function, resolving the contradiction between sealing reliability and microwave leakage
2Ease of operation
If process parameters are determined by worker experience, then the operation simplicity is maintained, but the diamond quality and consistency deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where sensors continuously monitor process parameters (temperature, pressure, gas flow) and feed this information to the control system. The control system automatically adjusts parameters based on real-time feedback, ensuring consistent diamond quality while maintaining ease of operation through automated control
Solution Approach 2:
The control system performs self-adjustment of process parameters based on pre-set optimization algorithms and real-time sensor data. The system automatically optimizes deposition conditions without requiring continuous manual intervention, achieving both high manufacturing precision and operational simplicity
3Measurement precision
If multiple measurement and monitoring devices are added to the MPCVD device, then the ability to monitor and optimize process parameters is improved, but the device complexity increases
Solution Approach 1:
The patent designs the upper cover plate with integrated multi-functional capabilities: it serves as a structural component, incorporates composite windows for observation and microwave shielding, and integrates multiple sensors (temperature, pressure, gas flow). This universal design approach allows one component to perform multiple functions, reducing overall device complexity while maintaining high measurement precision
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
Prevents microwave leakage, ensures consistent diamond growth conditions, and enhances diamond quality by optimizing process parameters, resulting in high-quality large-size diamonds with low impurity content and high thermal conductivity.
Implementation Method 1
a microwave quartz window (5) arranged between the deposition platform and the baseplate, and the reaction cavity is isolated from the air outside by the microwave quartz window
Implementation Method 2
the connection between the baseplate and the upper cover plate is sealed by an O-shaped sealing ring assembly
Implementation Method 3
an exhaust hole that is connected with a vacuumizing device is arranged on the baseplate, for vacuumizing the reaction cavity to form a vacuum environment
Implementation Method 4
the plasma diagnostic device is configured to measure the content of various carbon-containing groups on the growth surface of diamond
Implementation Method 5
a thickness measuring device is configured to measure the growth thickness of the diamond in real time
Implementation Method 6
the temperature measuring device is configured to detect the diamond temperature in real time
Implementation Method 7
the visual device is configured to detect surface defects and estimate temperature difference in real time
Data Source
AI summary
MPCVD device comprises deposition platform, substrate platform, lifting platform, microwave quartz window, upper cover plate, baseplate, pressure sensors, composite windows, thickness measuring device, visual device, temperature measuring device, plasma diagnostic device, vacuum sealing ring and microwave shielding sealing ring. Reaction cavity is formed by upper cover plate and baseplate, and inlet hole is arranged on top of upper cover plate, while exhaust hole is arranged on baseplate; microwave quartz window is annular shaped and arranged between deposition platform and baseplate, and reaction cavity is isolated from air outside by microwave quartz window; lifting platform is provided with vacuum channel and cooling channel therein; vacuum cavity, which is communicated with vacuum channel, is formed by lower surface of substrate platform and upper surface of lifting platform; and pressure sensor for monitoring gas pressure is arranged in vacuum cavity.