ZTMD Raffinate Coating for Disk Drive Particle Trapping
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Solution Overview
Problem
Current disk drive systems are susceptible to damage from sub-micronmeter particles due to their small fly height, and existing particle filters are inadequate in preventing contamination, as they can become saturated and dislodge debris, leading to increased contamination issues.
Innovation Solution
A viscous sticky layer of ZTMD raffinate is applied to the interior of the disk drive housing and air filter to trap debris particles, preventing them from contacting the disk and slider, and improving filter performance by ensuring trapped debris does not become dislodged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a particle filter is used to filter contaminant particles out of the air, then particle contamination is reduced, but the filter becomes saturated and air flow is restricted, and collected debris can become dislodged causing increased contamination
Solution Approach 1:
A viscous coating layer is applied to the filter as an intermediary substance. This coating layer captures particles that would otherwise clog the filter pores, allowing air to continue flowing through the filter while particles are trapped in the viscous material. The coating acts as a mediator between the air flow and the filter structure, preventing saturation without restricting productivity.
Solution Approach 2:
The physical state of the filter surface is changed by applying a viscous coating layer. This changes the surface properties from a dry, porous structure that clogs easily to a viscous surface that traps particles while maintaining pore openness. The parameter change in surface viscosity allows the filter to maintain both high particle capture efficiency and sustained air flow capacity.
2Reliability
If a particle filter is used to collect debris, then contamination is reduced, but physical shock can cause collected debris to become dislodged and fall onto the disk, creating larger contamination problems
Solution Approach 1:
The viscous coating layer serves as an intermediary bonding medium between the particles and the filter structure. Instead of particles being loosely collected on the filter surface where they can be dislodged by shock, the coating layer chemically or physically bonds to both the particles and the filter, creating a stable composite structure that resists dislodgement even under physical shock conditions.
Solution Approach 2:
The filter structure becomes a composite material system consisting of the filter substrate, the viscous coating layer, and the trapped particles. This composite structure provides enhanced mechanical stability and adhesion, preventing particle dislodgement while maintaining the filtration function. The composite nature of the coated filter creates a more robust particle retention system.
3Quantity of substance
If fly height of the slider over the disk is reduced to achieve higher storage density, then storage capacity increases, but the system becomes increasingly susceptible to damage from particle contamination
Solution Approach 1:
The harmful particles are extracted from the air environment before they can reach the head-disk interface. By applying the viscous coating to the housing interior surfaces and filter, particles are captured and removed from the air circulation path, preventing them from migrating to the sensitive slider-disk interface where they would cause damage at reduced fly heights.
Solution Approach 2:
The viscous coating acts as an intermediary barrier throughout the housing interior, creating multiple particle capture zones that prevent particles from reaching critical areas. This intermediary trapping system allows the system to operate at lower fly heights by ensuring the air environment remains particle-free, enabling higher storage density without proportionally increasing contamination risk.
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 ZTMD raffinate effectively removes debris particles, enhancing the reliability of disk drives by preventing contamination, while being cost-effective and thermally stable, with no volatility or emissions, thus improving the overall cleanliness and operational stability of the disk drive.
Implementation Method 1
it is highly viscous, adheres particles tightly, bonds strongly to metal surfaces
Implementation Method 2
A viscous sticky layer of ZTMD raffinate is applied to the interior of the disk drive housing and air filter to trap debris particles
Data Source
AI summary
A magnetic disk drive having a layer of ZTMD raffinate coated within a housing of the disk drive to trap debris in order to prevent contamination related failure of the disk drive. The ZTMD raffinate can be applied to the inside of the housing of the disk drive, such as to side walls of the housing and or the cover of the housing. The ZTMD raffinate can also be applied to a filter structure within the housing in order improve the performance of the filter structure and prevent contamination collected thereon from becoming dislodged.