Grinding liquid used for grinding back surface of storage hard disk magnetic head

A technology of back grinding and storage, which is applied in the field of grinding liquid, which can solve the problems of high price and low grinding rate, and achieve the effect of good dispersion stability and uniform particle distribution

Inactive Publication Date: 2005-08-10
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the grinding liquid on the back of the magnetic head is the same as that on the front of the magnetic head. The grinding liquid composed of nano-diamond powder or diamond polycrystalline ultrafine powder and oily medium is used. On the one hand, it is expensive, and on the other hand, the grinding rate is very low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment one: get single crystal diamond superfine powder 0.5g, polyoxyethylene (20) sorbitan monooleate nonionic surfactant 2g, pentaerythritol ester 60g, carbon 12 n-paraffin mineral oil 240g, di-tert-butyl 1 g of p-cresol antioxidant anti-adhesive agent, 0.1 g of benzotriazole derivative anti-oxidant and anti-adhesive agent, 1 g of 889D non-silicon defoamer of Lubrizol Company, 1 g of N, N-ethylene diester amide antistatic agent, fully Mix to make a suspension-like grinding liquid. The back of the magnetic head of the computer is ground with the abrasive liquid, and the surface roughness of the back of the magnetic head can reach 0.3-0.4nm.

Embodiment 2

[0017] Embodiment 2: Take 0.8g of single crystal diamond superfine powder, 2g of fatty alcohol polyoxyethylene ether nonionic surfactant, 80g of polyalphaolefin, 220g of carbon 13 isoparaffin mineral oil, di-tert-butyl p-cresol antioxidant Anti-adhesive agent 1.5g, benzotriazole derivative antioxidant anti-adhesive agent 0.1g, Lubrizol 889D non-silicon defoamer 1g, N, N-ethylene diester amide antistatic agent 1g, fully mixed to make it into a suspension liquid abrasive. The back of the magnetic head of the computer is ground with the abrasive liquid, and the surface roughness of the back of the magnetic head can reach 0.3-0.4nm.

Embodiment 3

[0018] Embodiment three: get single crystal diamond superfine powder 0.6g, sorbitan monooleate nonionic surfactant 2g, natural refined rapeseed oil 50g, carbon 13 n-paraffin mineral oil 250g, high temperature antioxidant liquid mixing two Alkyl diphenylamine 1g, IRGALUBEAF1 liquid ester polymer defoamer 1g, nonylphenol polyoxyethylene ether 1g, mix well to make it into a suspension-like grinding liquid. The back of the magnetic head of the computer is ground with the abrasive liquid, and the surface roughness of the back of the magnetic head can reach 0.3-0.4nm.

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Abstract

An abrasing liquid for abrasing the back of magnetic head for hard disc contains proportionally mineral oil containing C11-C13 alkane, oiling agent, superfine monocrystal diamond powder, antioxidizing anticorrosion agent, non-ionic surfactant, defoaming agent, and antistatic agent.

Description

technical field [0001] The invention relates to a grinding liquid used for grinding the back surface of a magnetic head of a memory hard disk, and belongs to the technical field of surface ultrafine grinding. Background technique [0002] The surface quality of memory hard disk heads is the bottleneck that limits the capacity and storage density of memory hard disks. In order to improve the surface quality of the magnetic head, many people have conducted a lot of research. The current research mainly focuses on the superfine grinding and polishing of the front side of the magnetic head, while the research on the back side of the magnetic head is rarely involved. The surface quality of the back of the magnetic head is very important to eliminate the stress concentration phenomenon of the magnetic head and the subsequent processing quality of the magnetic head. At present, the grinding liquid on the back of the magnetic head is the same as that on the front of the magnetic h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/14
Inventor 马江波高峰雒建斌潘国顺路新春
Owner TSINGHUA UNIV
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