Inkjet Head Adhesion Layer With Oxygen Gradient for Peeling Resistance
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Solution Overview
Problem
Existing inkjet heads face issues with durability during manufacturing processes and adhesion between the base material and functional layers, leading to poor long-term durability and rubbing durability due to peeling of layers caused by heat and ink interaction.
Innovation Solution
A base material adhesion layer containing Group 4 or Group 5 elements, nitrogen, and oxygen, with a higher atomic concentration of oxygen on the surface than inside, enhances adhesion and durability, preventing peeling and improving continuous ejection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a base material adhesion layer containing TaSiOx or metal nitride film is formed to improve adhesion and chemical resistance, then adhesion between base material and functional layer is improved, but the layer is easily peeled off at the nozzle interface due to heat of manufacturing processes
Solution Approach 1:
The invention changes the compositional parameters of the base material adhesion layer by incorporating specific elements (Group 13: Al, Ga, In; Group 14: Si, Ge, Sn; and oxygen) in controlled ratios. The oxygen content is specifically controlled to be 1-50 at% to optimize both adhesion strength and heat resistance, preventing peeling during manufacturing while maintaining bonding functionality
Solution Approach 2:
The invention creates a composite base material adhesion layer combining multiple elements (Group 13, Group 14, and oxygen) to achieve synergistic effects. This multi-element composite structure provides both strong adhesion to the base material and resistance to heat-induced peeling, while also ensuring good adhesion to the overlying functional layers
2Reliability
If a liquid repellent layer is formed to maintain stable surface state and prevent ink adhesion, then ejection performance is improved, but rubbing durability deteriorates due to surface wear from wiping materials
Solution Approach 1:
The invention applies preliminary protective action by forming a robust base material adhesion layer with optimized composition (Group 13, Group 14, and oxygen elements) before forming the liquid repellent layer. This pre-established strong adhesive foundation prevents peeling and enhances the overall durability of the liquid repellent layer against rubbing, while the liquid repellent layer itself maintains its ejection performance
3Strength
If plasma treatment is applied to improve adhesion of liquid repellent layer, then adhesion is enhanced, but peeling occurs at nozzle interface due to heat from plasma process
Solution Approach 1:
The invention performs preliminary strengthening by forming a heat-resistant base material adhesion layer with optimized elemental composition (Group 13, Group 14, and oxygen) before applying plasma treatment. This pre-prepared foundation can withstand the heat from plasma processing while providing strong adhesion, preventing peeling at the nozzle interface even after plasma treatment enhances liquid repellent layer bonding
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
The solution provides enhanced durability during manufacturing and long-term adhesion, ensuring stable ink ejection and resistance to rubbing, thereby maintaining excellent continuous ejection properties.
Implementation Method 1
a base material adhesion layer containing a Group 4 or Group 5 element, a nitrogen element and an oxygen element... enhances adhesion and durability, preventing peeling
Data Source
AI summary
A member for an inkjet head includes at least a base material, a base material adhesion layer and a functional layer in this order. The base material adhesion layer contains a Group 4 or Group 5 element, a nitrogen element and an oxygen element. An atomic concentration (atm %) of the oxygen element on a surface of the base material adhesion layer on a functional layer side where the functional layer is provided is higher than an atomic concentration (atm %) thereof inside the base material adhesion layer.