Patent
Production of gamma iron oxide
TLDR
In this paper, a solution of a ferrous salt is oxidized in the presence of α-FeO(OH) seed, a basic precipitant, and phosphoric acid or a water soluble salt thereof, which can be dehydrated, optionally tempered, reduced and reoxidized to needle-shaped γ-Fe 2 O 3.Abstract:
Process for producing ferromagnetic iron oxides whereby a solution of a ferrous salt is oxidized in the presence of α-FeO(OH) seed, a basic precipitant, and phosphoric acid or a water soluble salt thereof to form α-FeO(OH), which can be dehydrated, optionally tempered, reduced and re-oxidized to needle-shaped γ-Fe 2 O 3 . The resulting product has high coercive force values which make it especially useful for magnetic impulse recording and reproduction.read more
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Patent
Scribing sapphire substrates with a solid state UV laser
Kuo-ching Liu,Pei Hsien Fang,Dan Dere,Jenn Liu,Jih-Chuang Huang,Antonio D. Lucero,Scott Pinkham,Steven Oltrogge,Duane Middlebusher +8 more
TL;DR: In this article, a process and system scribe of sapphire substrates is described, by mounting a substrate, carrying an array of integrated device die, on a stage such as a movable X-Y stage including a vacuum chuck, and directing UV pulses of laser energy directed at a surface of the substrate using a solid state laser.
Patent
Method and apparatus for cutting devices from substrates
TL;DR: In this paper, a method and system for cutting a wafer comprising a semiconductor substrate attached to an array of integrated devices includes placing the wafer on a stage such as a movable X-Y stage including a vacuum chuck having a porous mounting surface.
Patent
Method and apparatus for cutting devices from conductive substrates secured during cutting by vacuum pressure
TL;DR: In this article, a method and system for cutting a wafer comprising a conductive substrate attached to an array of integrated devices includes placing the wafer on a stage such as a movable X-Y stage including a vacuum chuck having a porous mounting surface.
Patent
Coating iron oxide particles for magnetic recording
Gunter Dipl Chem Dr Buxbaum,Ingo Dr Pflugmacher,Franz Hund,Volker Dr Hahnkamm,Peter Woditsch +4 more
TL;DR: In this article, the reduction and reoxidation of needle-shaped particles of hydrated oxide of iron which have been surface treated against sintering is described, which comprises effecting the surface treatment by applying to the particles, one layer of oxygen-containing anions and a further layer of polyvalent cations, each layer weighing about 0.02 to 2% of the particle.
Patent
Production of acicular magnetic iron oxides
TL;DR: In this article, the production of acicular ferromagnetic iron oxide of highly uniform particle size by oxidizing an iron (II) hydroxide suspension at a pH of at least 11 with an oxygen-containing gas to form acicular iron (III) oxide hydroxides was discussed.
References
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Patent
Process for the preparation of gamma-feooh
TL;DR: Water soluble phosphorus and/or arsenic compounds are added as product stabilizers to the reaction mixture used to form g FeOOH nuclei, or to a reaction mixture in which previously formed Fe-OOH particles are grown to a larger size as mentioned in this paper.
Patent
Magnetic material and method of making the same
TL;DR: In this article, a solution of a hydrolysis-resistant, inorganic substance capable of forming on the alpha-FeOOH particles a firmly adhering covering was proposed.