EP1656331A1 - Werkstoff auf basis von sialonen - Google Patents

Werkstoff auf basis von sialonen

Info

Publication number
EP1656331A1
EP1656331A1 EP04763870A EP04763870A EP1656331A1 EP 1656331 A1 EP1656331 A1 EP 1656331A1 EP 04763870 A EP04763870 A EP 04763870A EP 04763870 A EP04763870 A EP 04763870A EP 1656331 A1 EP1656331 A1 EP 1656331A1
Authority
EP
European Patent Office
Prior art keywords
vol
material according
sialon
alpha
component
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.)
Ceased
Application number
EP04763870A
Other languages
German (de)
English (en)
French (fr)
Inventor
Bernd Bitterlich
Kilian Friederich
Ulrich Mowlai
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.)
Ceramtec GmbH
Original Assignee
Geramtec AG Innovative Ceramic Engineering
Ceramtec GmbH
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
Priority claimed from DE102004035364.6A external-priority patent/DE102004035364B4/de
Application filed by Geramtec AG Innovative Ceramic Engineering, Ceramtec GmbH filed Critical Geramtec AG Innovative Ceramic Engineering
Publication of EP1656331A1 publication Critical patent/EP1656331A1/de
Ceased legal-status Critical Current

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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
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    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/76—Crystal structural characteristics, e.g. symmetry
    • C04B2235/766—Trigonal symmetry, e.g. alpha-Si3N4 or alpha-Sialon
    • C—CHEMISTRY; METALLURGY
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    • C04B2235/76—Crystal structural characteristics, e.g. symmetry
    • C04B2235/767—Hexagonal symmetry, e.g. beta-Si3N4, beta-Sialon, alpha-SiC or hexa-ferrites
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/78—Grain sizes and shapes, product microstructures, e.g. acicular grains, equiaxed grains, platelet-structures
    • C04B2235/786—Micrometer sized grains, i.e. from 1 to 100 micron
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
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    • C04B2235/85—Intergranular or grain boundary phases
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9646—Optical properties
    • C04B2235/9661—Colour

Definitions

  • the present invention relates to a material based on SiAlONs, its production and use.
  • This object is achieved according to the invention by providing a material which consists of components A and B, where A stands for an alpha / beta-SiAlON and B for a hard material.
  • the material according to the invention contains 70 to 97% by volume, preferably 80 to 95% by volume, particularly preferably 84 to 91% by volume of component A and 3 to 30% by volume, preferably 5 to 20% by volume, particularly preferably 9 to 16% by volume Component B.
  • the raw material mixture of component A used according to the invention consists of the main constituents Si 3 N 4 , AIN, further additives such as Al 2 O 3 , Y 2 O 3 , Sc 2 O 3 , rare earth oxides and small amounts of compounds which Li , Ca, Mg, Sr included. Comparable mixtures are already known from DE 35 11 734 A1.
  • the material according to the invention arises from the above-mentioned raw material mixture and the added hard materials during a heat treatment at temperatures from 1800 to 2000 ° C. and holding times at the maximum temperature from 0.5 to 5 hours.
  • Component A consists of alpha and beta SiAlON as well as an amorphous or partially crystalline grain boundary phase.
  • the SiAlON phase of the sintered body inside consists of an alpha-SiAlON content of 10 to 90% by volume, preferably 12 to 60% by volume, particularly preferably 15 to 50 vol% and a proportion of beta-SiAlON 90 to 10 vol%, preferably 88 to 40 vol%, particularly preferably 85 to 50 vol% ' beta-SiAlON.
  • the proportion of alpha and beta SiAlON is determined on the basis of X-ray diffractometric images (according to Gazzara and Messier, J. Am. Ceram. Soc. Bull. 56 (1977)).
  • the grain boundary phase content is less than 10% by volume, preferably less than 5% by volume.
  • the grain boundary phase can be amorphous, but should preferably be partially crystalline.
  • the composition of A inside a sintered body can be varied by the production parameters such as, for example, the composition of the powder mixture, the sintering conditions in the furnace, the crucible material, the type of gas, the temperature and the sintering time.
  • component A there can be a gradient between the sintered body surface and the inside, so that the so-called as fired surface contains up to 100% alpha-SiAlON.
  • a gradient in component A can arise under certain conditions if the surface of the sintered body cools faster than the inside or the chemical composition of the surface is changed by reactions with the atmosphere.
  • An alpha-SiAlON-rich surface leads to a hard outer layer with a tough core.
  • component B for example SiC, Ti (C, N), TiC, TiN, carbides and / or nitrides of the elements of groups IVb, Vb and VIb of the periodic table (PSE) as well as scandium carbide and / or scandium oxyarbide or mixtures of the listed hard materials are used.
  • Hard materials are stored inter- and / or intragranularly during the heat treatment, ie both between and in the SiAlON grains and do not change during the heat treatment.
  • the size of the hard material particles used should therefore not exceed the size of the other structural components, alpha- and beta-SiAlON grains, since the hard materials would otherwise impair the mechanical properties of the material according to the invention.
  • the grain size of the hard materials should be less than 30 ⁇ m, preferably less than 15 ⁇ m, particularly preferably less than 5 ⁇ m.
  • the hard material particles can be globular grains, platelets or whiskers; globular grains are particularly preferred.
  • the maximum size of the alpha and beta SiAlON grains should be less than 90 ⁇ m, preferably less than 65 ⁇ m, particularly preferably less than 50 ⁇ m. While small grain sizes are usually aimed for in the known materials, it has surprisingly been found in the material according to the invention that the application properties are influenced only insignificantly by the grain size.
  • Thermal treatment to crystallize the amorphous grain boundary phase is possible and is even preferred.
  • the composition of the powder mixture and sintering conditions such as temperature, gas composition, gas pressure, time course, insulation and crucible material, crystalline phases, particularly preferably aluminum-containing melilite or disilicate.
  • the material according to the invention has a higher hot hardness, i.e. a higher wear resistance even at high cutting speeds at which the temperature at the cutting edge rises.
  • the material according to the invention can be coated with the known wear-reducing layers such as, for example, Al 2 O 3 , TiN or TiC, which increases the wear resistance.
  • the material according to the invention can be produced by methods known per se, as are also used in the production of high-performance ceramic components, in particular SiAlON materials, by powder mixing, shaping, sintering and finishing by grinding.
  • the gas atmosphere during sintering should be inert and can be N 2 or a mixture of N 2 and other inert gases such as Ar.
  • the table below shows exemplary embodiments of compositions of the material according to the invention. The high hardness is remarkable in each case.
  • Hardness (HV10) 1730 1810 1820 1810 1790 At final density: th. theoretical density
  • the known Si N and SiAlON cutting materials are light gray to dark gray-black
  • the material according to the invention is gray-green when SiC is added and gray-brown when Ti (C, N) is added.
  • the material according to the invention surprisingly does not show the disadvantages of the known cutting materials, the initial wear, when machining gray cast iron with the usual long continuous cuts, but retains a sharp edge until the end of its service life.
  • the material according to the invention surprisingly also proves advantageous in the case of so-called "notch wear":
  • notch wear When machining gray cast iron with particularly aggressive cast skin, a deep notch is formed after a short time in the cutting materials known to date. This wear is mainly caused by chemical wear, ie chemical reactions between the material of the cutting tool and the material of the workpiece, whereas the material according to the invention shows such wear only after a considerably longer service life.
  • FIG. 1 and FIG. 2 show the advantage of the material according to the invention, “new cutting material”, over a material made of silicon nitride, “reference”.
  • the wear width on the main cutting edge, “VBH”, is indicated in FIG. 1 as a function of the number of cuts.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Products (AREA)
EP04763870A 2003-08-07 2004-08-06 Werkstoff auf basis von sialonen Ceased EP1656331A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10336930 2003-08-07
DE102004035364.6A DE102004035364B4 (de) 2003-08-07 2004-07-21 Werkstoff auf der Basis von SiAIONen
PCT/EP2004/008836 WO2005016847A1 (de) 2003-08-07 2004-08-06 Werkstoff auf basis von sialonen

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EP1656331A1 true EP1656331A1 (de) 2006-05-17

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EP04763870A Ceased EP1656331A1 (de) 2003-08-07 2004-08-06 Werkstoff auf basis von sialonen

Country Status (7)

Country Link
US (1) US7514383B2 (ko)
EP (1) EP1656331A1 (ko)
JP (1) JP5221875B2 (ko)
KR (1) KR101181548B1 (ko)
BR (1) BRPI0413423A (ko)
CA (1) CA2534321C (ko)
WO (1) WO2005016847A1 (ko)

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EP2402098B2 (en) † 2004-12-22 2021-03-03 Ngk Spark Plug Co., Ltd. Sialon insert and cutting tool equipped therewith

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DE102007055711B4 (de) 2006-12-06 2019-06-06 Ceramtec Gmbh Werkstoff auf der Basis von SiAlONen
WO2008068283A2 (de) * 2006-12-06 2008-06-12 Ceramtec Ag WERKSTOFF AUF DER BASIS VON SiAlONen
SE530251C8 (sv) 2006-12-27 2008-05-06 Sandvik Intellectual Property Keramiskt material och skär för spånformande metallbearbetning tillverkat avmaterialet
SE530252C2 (sv) * 2006-12-27 2008-04-08 Sandvik Intellectual Property Keramiskt material och skär tillverkat av materialet
US7855159B1 (en) * 2007-01-11 2010-12-21 Kennametal Inc. Alpha-beta SiAlON ballistic ceramic armor
WO2011058176A1 (de) * 2009-11-13 2011-05-19 Ceramtec Gmbh Gedopte alpha-beta-sialonkeramiken
US9187376B2 (en) * 2012-12-21 2015-11-17 Sumitomo Electric Industries, Ltd. Sintered compact, cutting tool formed using sintered compact, and method for manufacturing sintered compact
CN105121479B (zh) 2013-03-15 2018-03-02 凯斯特罗有限公司 多官能分散剂粘度指数改进剂
CN103755353B (zh) * 2014-01-24 2016-03-02 大连海事大学 一种Y-α-SiAlON透明陶瓷的快速低温制备方法
ES2743485T3 (es) * 2014-12-12 2020-02-19 Ceram Gmbh Sialón alfa/beta que tiene actividad de sinterización mejorada y gran resistencia de los bordes
EP3078649B1 (de) * 2015-04-10 2017-10-18 MTU Aero Engines GmbH Verbundkeramik mit korrosionsschutzschicht und verfahren zur herstellung
KR20170018718A (ko) 2015-08-10 2017-02-20 삼성전자주식회사 비정질 합금을 이용한 투명 전극 및 그 제조 방법
DE102019116153A1 (de) 2019-06-13 2020-12-17 Kennametal Inc. Panzerungsplatte, Panzerungsplattenverbund und Panzerung
US20210276923A1 (en) * 2019-12-04 2021-09-09 Kennametal Inc. Composite ceramic bodies and applications thereof

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EP2402098B2 (en) † 2004-12-22 2021-03-03 Ngk Spark Plug Co., Ltd. Sialon insert and cutting tool equipped therewith

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JP5221875B2 (ja) 2013-06-26
US7514383B2 (en) 2009-04-07
US20070010392A1 (en) 2007-01-11
KR20060125680A (ko) 2006-12-06
WO2005016847A1 (de) 2005-02-24
CA2534321C (en) 2012-03-13
WO2005016847A8 (de) 2005-06-09
CA2534321A1 (en) 2005-02-24
KR101181548B1 (ko) 2012-09-10
JP2007501759A (ja) 2007-02-01
BRPI0413423A (pt) 2006-10-10

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