Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
  • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
  • B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent

Definitions

• the invention relates to the use of two- and / or three-metal sulfides as active, in particular halogen-free, fillers for grinding wheels, in particular for grinding or cutting wheels, and grinding wheels containing such fillers.
• Abrasives e.g. Separation letters consist essentially of three components, namely the abrasive, granular abrasive, a binder (resin) and fillers.
• Halides e.g. lead chloride, fluorspar, cryolite etc.
• chalcogenides e.g. pyrite, antimony sulfides, zinc sulfide, molybdenum sulfide, selenides, tellurides etc.
• low-melting metals e.g. lead, tin, low-melting mixed metals
• high-pressure lubricants e.g. high-pressure lubricants
• Active fillers based on complex halides are e.g. mentioned in EP-PS 0 299 950 and AT-PS 372 894.
• W095 / 25231 by the applicant proposes an additive to friction lining mixtures, which consists of a mixture of Fe-II-sulfide with a sulfide of molybdenum and / or zinc and / or tungsten and / or titanium, as well as the W095 / 02657 the applicant an additive containing a combination of Cu-l-sulfide with at least one other sulfide of molybdenum, zinc, antimony, tungsten, tin and / or titanium.
• EP-A 629 472 relates to the use of metal sulfides in the sintered metal bond zone between the steel support body and the cutting segments of an abrasive tool.
• EP-A 482 412 relates to an abrasive body which contains active fillers in the usual way, which contain a combination of tin, FeS 2 and K 2 SO 4 .
• molybdenum disulfide as a filler in bulk for grinding tools is i.a. described in DE-OS 2 537 091.
• the active filler is preferably a multiphase sulfide mixture, in particular a combination of at least one compound of the formula M1 l M2 m M3 n S x with one or more sulfides of Ti, V, Mn, Fe, Cu, Zn, Mo, W, Sb, Sn and Bi.
• Two-metal sulfides and three-metal sulfides from the group given above are known from the literature and also occur as minerals; only as examples (in brackets the corresponding minerals) are Cu 2 FeSnS 4 (stannite), CU 2 FeSn 3 S 8 (rhodostannite), Cu 3 SnS 4 (Kurmanit), Mn 2 SnS 4 , SnFe 2 S 4 , Cu 2 TiS 2 , called. They have already been provided as solid lubricants, especially for friction linings, according to an unpublished proposal by the applicant.
• the two-metal and three-metal sulfides proposed according to the invention as active fillers for abrasive bodies can be prepared by the processes customary for the production of sulfides, i.e. sulfidation (heating of metal powders with sulfur or polysulfides) or reaction of hydroxides or oxides with ammonium sulfide or H 2 S wet chemical or dry way.
• sulfidation heating of metal powders with sulfur or polysulfides
• reaction of hydroxides or oxides with ammonium sulfide or H 2 S wet chemical or dry way i.e. sulfidation (heating of metal powders with sulfur or polysulfides) or reaction of hydroxides or oxides with ammonium sulfide or H 2 S wet chemical or dry way.
• the multimetal sulfides can also have a melt phase, e.g. by melting together binary pure sulfides in the absence of air, often resulting in mixtures of several different phases.
• Wet chemical precipitation of multimetal sulfides is also known from the literature. It has been shown that multimetal sulfides are also formed during the sulfidation of metal alloys and metal powder mixtures, which can be detected by means of X-ray diffraction or electron microscopy using the microsensor.
• Abrasive bodies according to the invention in particular grinding wheels, contain an abrasive, granular abrasive, a binder, in particular phenolic resins or ceramic phases being customary as binders, and a filler according to the invention, if appropriate in addition to other fillers.
• the proportion of the filler according to the invention is advantageously at least 5% by mass, based on the total filler.
• the grinding wheels according to the invention are manufactured in a known manner - e.g. by mixing the components, press forms and hardening - and show good cutting quality (white cut) and high cutting performance.
• Example of an abrasive wheel with filler according to the invention (in vol.%): grain 50% Normal corundum grain size 1000 ⁇ m binding 30% Resin 20% (resol, novolak), filler 10% Fabric reinforcement 5% Pores 15% 100% ⁇
• a mixture of 50% CU 2 S, 40% SnS and 10% FeS is heated to 1000 ° C. in the absence of air. After cooling, a compact block is obtained which is broken and finely ground, with particle sizes of ⁇ 150 ⁇ m preferably being achieved. Phases of the composition cu 5 SnS 4 , Cu 5 Sn 2 S 7 , Cu 2 FeSnS 4 and Cu 2 FeSn 3 S 8 can be detected in the filler thus produced.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Polishing Bodies And Polishing Tools (AREA)

Applications Claiming Priority (2)

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Cited By (1)

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• 1995
  • 1995-10-16 AT AT0171695A patent/AT402907B/de not_active IP Right Cessation
• 1996
  • 1996-10-14 EP EP96890162A patent/EP0768149A3/fr not_active Withdrawn

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