DE508460C - Process for the surface treatment of synthetic precious stones of the corundum and spinel class - Google Patents

Process for the surface treatment of synthetic precious stones of the corundum and spinel class

Info

Publication number
DE508460C
DE508460C DEI37068D DEI0037068D DE508460C DE 508460 C DE508460 C DE 508460C DE I37068 D DEI37068 D DE I37068D DE I0037068 D DEI0037068 D DE I0037068D DE 508460 C DE508460 C DE 508460C
Authority
DE
Germany
Prior art keywords
corundum
surface treatment
precious stones
spinel
synthetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEI37068D
Other languages
German (de)
Inventor
Dr Hermann Espig
Dr Wolfgang Teubner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEI37068D priority Critical patent/DE508460C/en
Application granted granted Critical
Publication of DE508460C publication Critical patent/DE508460C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/10—Inorganic compounds or compositions
    • C30B29/16—Oxides
    • C30B29/22—Complex oxides
    • C30B29/26—Complex oxides with formula BMe2O4, wherein B is Mg, Ni, Co, Al, Zn, or Cd and Me is Fe, Ga, Sc, Cr, Co, or Al

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Adornments (AREA)

Description

Verfahren zur Oberflächenbehandlung von synthetischen Edelsteinen der Korund- und Spinellklasse Für die technische Verwendung synthetischer Edelsteine ist es bisher erforderlich gewesen, die Steine zu schleifen und zu polieren, um eine spiegelglatte Oberfläche zu erhalten.Process for the surface treatment of synthetic gemstones of the corundum and spinel class For the technical use of synthetic gemstones it has hitherto been necessary to grind and polish the stones in order to to obtain a mirror-smooth surface.

Es wurde nun gefunden, d.aß die Herstellung derartiger Oberflächen bei synthetischen Edelsteinen der Korund- und Spinellklasse, die ganz oder im wesentlichen aus Tonerde bestehen, auf erheblich einfacherem und kürzerem Wege, nämlich dadurch erfolgen kann, daß die zu glättenden Steine während einiger Minuten mit geschmolzenem Borax behandelt werden, wodurch sie eine spiegelglatte und gleichzeitig durchsichtige Oberfläche erhalten. Unter Borax ist hierbei auch das dem natürlichen Borax entsprechende Kalisalz zu verstehen; der anzuwendende Borax kann auch noch freie Borsäure enthalten.It has now been found that such surfaces can be produced in the case of synthetic gemstones of the corundum and spinel classes, wholly or essentially consist of alumina, in a much simpler and shorter way, namely through it can be done that the stones to be smoothed for a few minutes with melted Borax are treated, which gives them a mirror-like and at the same time transparent Surface preserved. Borax here also means that which corresponds to natural borax To understand potash salt; the borax to be used can also contain free boric acid.

Durch die beschriebene Behandlungsweise soll lediglich eine Oberflächenätzung zur Beseitigung der Oberflächenrauheit erzielt werden. Im Gegensatz hierzu bewirkt das bekannte Ätzverfahren mit Kalium#bisulfat oder mit den aus der britischen Patentschrift 193 081 bekannten Ätzmitteln eine Tiefätzung, d. h. also eine Verstärkung der Rauheit durch Herausarbeiten der elementaren Kristallflächen. Die bekannten Verfahren weisen überdies den Nachteil auf, daß infolge der verschiedenen Stärke, mit der die einzelnen Kristallflächen, z. B. vom Bisulfat, angegriffen werden, regelmäßig eine Mattierung gewisser Flächen erzeugt wird, die bei dem vorliegenden Verfahren gerade vermieden werden soll.The method of treatment described is only intended to achieve surface etching to remove the surface roughness. In contrast to this, the known etching process with potassium bisulfate or with the etching agents known from British patent 193 081 causes deep etching, that is to say reinforcement of the roughness by working out the elementary crystal surfaces. The known methods also have the disadvantage that due to the different strength with which the individual crystal faces, for. B. are attacked by bisulfate, a matting of certain areas is regularly produced, which is precisely to be avoided in the present process.

Das neue Verfahren eignet sich insbesondere zur Glattätzung von Lager- und Uhrensteinen aus synthetischen Steinen der erwähnten Zusammensetzung, kann aber auch auf Rohbirnen sowie gesägte oder geschliffene Gegenstände aller Art Anwendung finden.The new process is particularly suitable for smooth etching of bearing and watch stones made of synthetic stones of the composition mentioned, but can Can also be used on raw pears as well as sawn or ground objects of all kinds Find.

Claims (1)

PATENTANSPRUCH: Verfahren zur Erzeugung glänzender Oberflächen auf synthetischen Edelsteinen der Korund- und Spinellklasse, dadurch gekennzeichnet, daß die Edelsteine kurze Zeit mit geschmolzenem Brxx behandelt werden.PATENT CLAIM: Process for producing shiny surfaces synthetic gemstones of the corundum and spinel class, characterized by that the gemstones are treated with molten Brxx for a short time.
DEI37068D 1929-02-12 1929-02-12 Process for the surface treatment of synthetic precious stones of the corundum and spinel class Expired DE508460C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEI37068D DE508460C (en) 1929-02-12 1929-02-12 Process for the surface treatment of synthetic precious stones of the corundum and spinel class

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI37068D DE508460C (en) 1929-02-12 1929-02-12 Process for the surface treatment of synthetic precious stones of the corundum and spinel class

Publications (1)

Publication Number Publication Date
DE508460C true DE508460C (en) 1931-09-03

Family

ID=7189420

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI37068D Expired DE508460C (en) 1929-02-12 1929-02-12 Process for the surface treatment of synthetic precious stones of the corundum and spinel class

Country Status (1)

Country Link
DE (1) DE508460C (en)

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