BeO Ceramic Plate Joining for Low-Temperature Hermetic Sealing

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Solution Overview

Problem

Existing ceramic joining methods require high temperatures and pressures, specialized ovens, and do not allow for hermetic sealing or easy repair, leading to high manufacturing costs and material alteration at the joint area.

Innovation Solution

A method for joining ceramic pieces using a controlled wetting and flow of a joining material, such as aluminum, at low temperatures and low pressures, with a hermetic seal achieved by controlling the atmosphere and using mesas or standoffs to maintain joint integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If liquid phase sintering is used to join ceramic materials, then strong bonds are achieved, but very high temperatures and pressures are required

Engineering Contradiction:

Improvebond strengthVSAvoidjoining temperature

Core Design Contradiction:

StrengthVSTemperature

Solution Approach 1:

A metallic joining layer is introduced as an intermediary between ceramic pieces. This layer enables bonding at lower temperatures by metallurgically bonding to the ceramic surfaces without requiring the extreme temperatures of liquid phase sintering, thus resolving the contradiction between bond strength and joining temperature

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The joining process changes the temperature parameter from very high (liquid phase sintering) to moderate (metallurgical bonding), while maintaining strong bonds through the metallic joining layer that creates reliable mechanical and metallurgical connections

Inventive Principle:

Principle #35Parameter changes

2Strength

If diffusion bonding is used to join ceramic pieces, then strong bonds are achieved, but significant time is required and material alteration occurs

Engineering Contradiction:

Improvebond strengthVSAvoidjoining time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The metallic joining layer serves as a mediator that enables rapid bonding compared to diffusion bonding. It creates strong bonds through metallurgical bonding and mechanical interlocking without requiring the extended time periods associated with diffusion processes

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The process replaces the slow diffusion mechanism with a faster metallurgical bonding mechanism. The metallic layer bonds to ceramic surfaces through controlled metallurgical reactions and mechanical interlocking, significantly reducing joining time while maintaining bond strength

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If high contact pressures are applied during ceramic joining, then strong bonds are achieved, but specialized process ovens and fixturing are required

Engineering Contradiction:

Improvebond strengthVSAvoidprocess equipment complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The process changes the pressure parameter from very high (hot pressing) to moderate levels. The metallic joining layer creates strong bonds at lower pressures through metallurgical bonding and mechanical interlocking, eliminating the need for complex hot pressing equipment and specialized fixturing

Inventive Principle:

Principle #35Parameter changes

4Ease of manufacture

If ceramic pieces are joined at low temperatures, then manufacturing costs are reduced, but hermetic sealing is not achieved

Engineering Contradiction:

Improvemanufacturing costVSAvoidhermetic seal

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The metallic joining layer acts as a hermetic sealant in addition to providing mechanical bonding. It fills gaps and crevices between ceramic pieces, creating a continuous barrier that prevents gas or liquid penetration, thus achieving hermetic sealing at low temperatures without compromising reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The assembly creates a composite structure with metallic joining layers between ceramic pieces. This composite approach combines the advantages of both materials: the low-temperature processing and hermetic sealing capabilities of metals with the structural integrity and thermal stability of ceramics

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 method results in hermetically sealed ceramic joints that can be repaired, reducing manufacturing costs and energy consumption, and maintaining the material properties of the ceramics, suitable for semiconductor processing applications.

Implementation Method 1

a joining method for joining ceramic pieces at a low temperature and which provides a hermetic seal

Methodology Applied

Scientific EffectWetting: Wetting

Data Source

PatentUS12558734B2Multi-layer ceramic plate device

Publication Date: 2026.02.24 WATLOW ELECTRIC MANUFACTURING CO

AI summary

An electrostatic chuck includes a ceramic top plate layer made of a beryllium oxide material, a ceramic bottom plate layer made of a beryllium oxide material, a ceramic middle plate layer disposed between the ceramic top plate layer and the ceramic bottom plate layer, an electrode layer disposed between the ceramic top plate layer and the ceramic middle plate layer, and a heater layer disposed between the ceramic middle plate layer and the ceramic bottom plate layer. The electrode layer joins and hermetically seals the ceramic top plate layer to the ceramic middle plate layer, and the heater layer joins and hermetically seals the ceramic middle plate layer to the ceramic bottom plate layer.