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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: 2006-10-11
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 anti-oxidant preservative, 0.1 g of benzotriazole derivative anti-oxidant preservative, 1 g of 889D non-silicon antifoaming agent of Lubrizol Company, 1 g of N, N-ethylene diester amide antistatic agent, fully mixed to make It becomes 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 Preservative 1.5g, benzotriazole derivative anti-oxidant preservative 0.1g, Lubrizol 889D non-silicon antifoaming agent 1g, N, N-ethylene diester amide antistatic agent 1g, mix well to make it into a suspension Slurry. 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

The invention discloses a grinding liquid used for grinding the back surface of a magnetic head of a memory hard disk, belonging to the technical field of surface superfine grinding. The grinding liquid contains the following components: mineral oil of eleven-carbon to thirteen-carbon alkanes, oily agent, diamond single crystal superfine powder, anti-oxidant and anti-corrosion agent, non-ionic surfactant, defoamer and antistatic agent, The weight ratio of each component is: alkane mineral oil: 50-94.79%; oily agent: 5-35%; diamond superfine powder: 0.01%-5%; anti-oxidant preservative: 0.02-0.5%; non-ionic Surfactant: 0.1-5%; defoamer: 0.03-1.5%; antistatic agent: 0.05-3.0%. The use of the grinding liquid can reduce the cost, improve the work efficiency and improve the surface grinding precision, the surface has no scratches after grinding, the surface residual stress is low, and the surface roughness is 0.3-0.4 nanometers.

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 Patents(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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