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Lapping apparatus

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Lapping apparatus

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Apparatus for lapping at high speeds with fine abrasive particles and rotatable abrasive platen.

Lapping apparatus

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Lapping apparatus with upper and lower turntables and fittings to hold disk-shaped workpieces.

Lapping apparatus

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In lapping apparatus with upper and lower turntables and disk-shaped workpiece holders between the these and defining receiving holes for workpieces.

Lapping composition

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Lapping composition comprising mixture of base powder of plate alumina which has been milled and classified to form powder of 1st average grain size; and 0.3-15 wt% of 2nd powder of plate alumina milled and classified to average grain size 1.3-2.33 times greater than that of 1st powder.

Lapping head

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Improved lapping head comprises means for supporting abrasive wheels each carried by corresponding shaft and, able to oscillate in direction of vertical axis.

Lapping machine

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Lapping machine has platen stable to temp. change, of cast Fe alloy containing (wt%) 1-4 C, <38 Ni+Cu, <2 Si, <2 Mn, <0.1 S, <0.15 P, >0.1 Mg. Spherical graphite grains (<50µm dia.) are dispersed in cast Fe alloy.

Lapping machine

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Lapping material

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Lapping surface plate of material containing C 0.5-3.5, Si 1-7, Ni 5-15, Mn ¢1%, balance Fe, and with addition of ¢1% Mg, Ca and/or Ce, with graphite structure and hardness of =250 Hv, is produced without quenching or rapid cooling to improve use in lapping operations, e.g., on semiconductor substrates.

Lapping slurry

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Thickened lapping slurry comprises abrasive grains dispersed in aq. carrier containing glycerine <80, triethanolamine 1-70 and water soluble silicate <10 wt%.

Lapping surfaces

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A description of the new series of computer controlled ELC lapping machines manufactured by Melchiorre. Features include electrically controlled pressure and cooled lapping discs.

Lapping tape

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Lapping tape comprising base and coat of abrasive particles consisting of acicular iron oxide powder (magnetite of opt. Co-containing gamma-Fe oxide) with surface area of _30m*2/g (BET method); and 2-30 % wt granular inorg. powder with Moh's hardness _7, coating having centerline mean roughness of 0.015-0. 025µm.

Lapping tape

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Lapping tape with 3-25µm thick lapping layer formed of paint coating containing organic powders, binder and 20-60 wt% solvents with b.pt >120°C.

Lapping tape

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Flexible lapping tape and 3-25µm lapping layer comprising paint with inorganic powder, binder and solvents. Last contains 20-60 wt% organic solvent of b.pt >120°C.

Lapping tools

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Method of manufacturing spherical graphite cast Fe for lapping tools.