Chemically Modified Glass Substrate for CVD Diamond Deposition

Solution Overview

Problem

Diamond coatings on glass substrates using CVD thermal processing often result in ion diffusion, which eliminates or reduces the chemical modification of the glass surface, compromising its durability and scratch resistance.

Innovation Solution

A method involving chemical modification of glass substrates through ion substitution, followed by CVD diamond deposition on one side, with the option to further modify the other side post-deposition, to maintain the ion exchange-induced strength and hardness while applying a diamond layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If CVD thermal processing is used for diamond deposition on chemically modified glass, then diamond coating can be deposited, but ion diffusion occurs which eliminates or reduces the chemical modification of the glass surface

Engineering Contradiction:

Improvechemical modification stabilityVSAvoidion substitution depth control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The glass substrate undergoes chemical modification through ion substitution before the CVD diamond deposition process. By performing the ion exchange in advance (using molten salt baths at temperatures between 300-450°C), the glass surface is pre-strengthened with compressed stress layers before encountering the thermal stress of CVD processing, thereby preserving the chemical modification despite subsequent heating

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The processing sequence is divided into distinct stages: first chemical modification through ion substitution, then CVD diamond deposition. This segmentation allows each process to be optimized independently and prevents the thermal processing from degrading the chemical modification by separating the ion exchange step from the high-temperature diamond deposition step

Inventive Principle:

Principle #1Segmentation

2Strength

If glass is chemically modified by immersion in salt bath at high temperature, then glass surface strength and hardness are increased, but subsequent CVD heating causes ion diffusion that reduces this modification

Engineering Contradiction:

Improveglass surface strengthVSAvoidion substitution stability

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The glass substrate undergoes chemical modification through ion substitution before the CVD diamond deposition process. By performing the ion exchange in advance (using molten salt baths at temperatures between 300-450°C), the glass surface is pre-strengthened with compressed stress layers before encountering the thermal stress of CVD processing, thereby preserving the chemical modification despite subsequent heating

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The ion substitution process uses controlled parameters (temperature between 300-450°C, specific salt bath composition, controlled immersion time) to achieve the desired ion exchange depth and surface compression without creating conditions that would promote excessive ion diffusion during subsequent CVD processing

Inventive Principle:

Principle #35Parameter changes

3Strength

If diamond coating is deposited on glass substrate, then hardness and scratch resistance are improved, but the chemical modification is compromised due to ion diffusion during CVD processing

Engineering Contradiction:

Improvescratch resistanceVSAvoidchemical modification retention

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The glass substrate undergoes chemical modification through ion substitution before the CVD diamond deposition process. By performing the ion exchange in advance (using molten salt baths at temperatures between 300-450°C), the glass surface is pre-strengthened with compressed stress layers before encountering the thermal stress of CVD processing, thereby preserving the chemical modification despite subsequent heating

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The final product is a composite structure combining chemically modified glass substrate with CVD diamond coating. The glass substrate provides chemical resistance and structural integrity while the diamond coating provides extreme hardness and scratch resistance, with both functionalities preserved through proper process sequencing

Inventive Principle:

Principle #40Composite materials

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 ensures that the glass substrate retains its enhanced durability and scratch resistance while allowing for the deposition of a diamond coating, addressing the issue of ion diffusion during CVD processing.

Implementation Method 1

CVD deposited diamond layer

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Implementation Method 2

potassium or other ion diffusion from the glass surface

Methodology Applied

Scientific EffectIon diffusion: Diffusion

Implementation Method 3

chemically modified through ion substitution

Methodology Applied

Scientific EffectIon substitution: Ion Exchange

Data Source

PatentUS20240208857A1Glass Modification Process Usable With CVD Diamond Deposition

Publication Date: 2024.06.27 AKHAN SEMICONDUCTOR INC

AI summary

A diamond system includes a glass substrate having a first and a second side, wherein the second side is chemically modified through ion substitution. CVD deposited diamond layer can be present on the first side or additional sides or edges.