Cleaning efficiency improvement and defect reduction in slider heads cleaning process with ultrasonic optimization by DOE technique | |
| Author | Arunrat Sukruang |
| Subject(s) | Ultrasonic cleaning Hard disks (Computer science) |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Microelectronic and Embedded systems, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | In hard disk drive, the spacing between magnetic recording head and disk is one of critical parameters. The more advance technology of head design, the lower spacing is required. Consequently, the cleanliness of head will play the important role for good and reliable product. This research investigates the head cleanliness improvement through cleaning parameters optimization. The side effect call “burn mark” which is resulted from “Hydrogen Embrittlement of metal” on substrate will also be monitoring and controlled at minimum rate. From this study using DOE technique, the optimum power, time and sweep of ultrasonic obtained from experiment are 800 watts/250 seconds/ 100 watts, 900 watts/500 seconds/ 100 watts and 500watts/100 seconds/ 100 watts for tank#1, 2 and 3 respectively. After confirmation run in production line, the result show the improvement of cleaning efficiency from 96.774%removal to 98.469%removal, the burn mark defect is 0%defect versus 0.02%defect base line. In additional, the total process time is also reduced from 58 to 35 minutes. |
| Year | 2014 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Microelectronics (ME) |
| Chairperson(s) | Afzulpurkar, Nitin V. |
| Examination Committee(s) | Bohez, Erik L. J. ;Jirapan Prapapornsuk;Peerapol Boonyuen; |
| Scholarship Donor(s) | Western Digital ;NECTEC, Thailand ;AIT Fellowship; |