EP0204067A1 - Formkörper mit hoher Härte und hoher Zähigkeit für die Bearbeitung von Metallen, Hartmetallen, Keramiken und Gläsern - Google Patents
Formkörper mit hoher Härte und hoher Zähigkeit für die Bearbeitung von Metallen, Hartmetallen, Keramiken und Gläsern Download PDFInfo
- Publication number
- EP0204067A1 EP0204067A1 EP86102025A EP86102025A EP0204067A1 EP 0204067 A1 EP0204067 A1 EP 0204067A1 EP 86102025 A EP86102025 A EP 86102025A EP 86102025 A EP86102025 A EP 86102025A EP 0204067 A1 EP0204067 A1 EP 0204067A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metals
- volume
- shaped body
- binder metal
- metal phase
- 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.)
- Withdrawn
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 33
- 239000002184 metal Substances 0.000 title claims abstract description 33
- 150000002739 metals Chemical class 0.000 title claims abstract description 19
- 239000000919 ceramic Substances 0.000 title claims abstract description 5
- 239000011521 glass Substances 0.000 title claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims abstract description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000011733 molybdenum Substances 0.000 claims abstract description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 4
- 239000010937 tungsten Substances 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000000465 moulding Methods 0.000 abstract description 7
- 238000005520 cutting process Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 230000037396 body weight Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/062—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on B4C
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
- C22C32/0057—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides based on B4C
Definitions
- the invention relates to moldings with high hardness and high toughness for the processing of metals, hard metals, ceramics and glasses made of sintered boron carbide and a binder metal phase.
- Boron carbide is particularly resistant to sandblasting. This opens up certain possible uses for sintered bodies containing boron carbide, although the low breaking strength of the sintered bodies must be taken into account.
- the wear value of a sintered body with 95% by weight of boron carbide (20% by weight of C) and 5% by weight of Fe compared to the wear values of sintered bodies made of W C -Co or TiC-Fe-Cr or TiC-VC-Fe-Ni the lowest (RKKieffer, P.Schwarzkopf "Hartscher und Hartmetalle", Springer-Verlag 1953, pages 524 and 525). Elsewhere in this document (page 327) it is mentioned that attempts to set boron carbide with tough metals have failed.
- B 4 C particles are sintered with powder of the known binding metals cobalt or nickel, undesirable chemical reactions and the formation of further phases, for example borides, occur. As a result, due to the different properties of the phases that are already present and those that are forming, cracks and gaps can already form in the shaped body during cooling.
- the invention had for its object to present molded articles made of B 4 C, in which the strength, in particular the Toughness compared to moldings made of pure B 4 C is increased and which are particularly suitable for cutting or grinding tools or for applications in which mechanical wear loads or high surface pressures have to be countered, such as, for example, in the case of nozzles.
- the object of the invention is also to provide a simple method for producing such molded articles.
- the method according to the invention is intended to be able to produce cutting platelets for machining or other moldings for tools for grinding, honing, rubbing, etc. of metals, in particular non-ferrous metals, hard metals, ceramics and glasses.
- the carbon doping of the B 4 C can be in the range between 0% by weight and 2.0% by weight of the shaped body weight.
- the binder metal phase content is in the range between 10 and 15% by volume of the shaped body volume.
- Mo and W belong to the metals with low heat of formation of both metal borides and carbides.
- the B 4 C is doped with carbon.
- 0.1 to 2.0% by weight of activated carbon, based on the product weight, is homogeneously mixed into the powder mixture from step a) before step b).
- the compact can be heated to the sintering temperature and then introduced into the die. The final compact can be ejected hot from the die and then cooled.
- the sintering temperature is with carbon doping near the upper range value.
- the hot pressing of Mo and B 4 C powders takes place at temperatures at which both materials are compressed but no molten phase occurs yet.
- the essence of the method according to the invention is the comparatively rapid execution of the hot pressing, in which even a very small proportion of the metal powder in the powder mixture is retained as the metallic phase in the molded product and embeds the B 4 C particles.
- Molded articles were produced: with 5% by volume Mo (corresponds to 20% by weight) and 95% by volume B 4 C; with 15 vol.% Mo and 85 vol.% B 4 C 7 and with 35 vol.% Mo (corresponds to 80 wt.%) and 65 vol.% B 4 C.
- the shaped articles produced according to the invention clearly show the separation of the embedded B 4 C particles (B 4 C dark, Mo light) from the surrounding Mo area. These differences are also confirmed in the scanning electron microscope and an X-ray scan of the same section. The X-ray fine structure analysis shows the metallic Mo in the compacts. The clear separation of B 4 C-containing areas and Mo-containing intermediate layers with thicknesses down to 3 / um was proven.
- Compacts were sintered using a semi-isostatic hot press with a compressive force of approx. 80 kN. Shaped bodies were produced and tested, the Mo contents ent held between 5% and 35% by volume. For this purpose, the homogeneously mixed powders of molybdenum (37 - 140 ⁇ m) and boron carbide (0.1 - 1360 ⁇ m) were filled into a graphite matrix. Square and round platelets were produced with punches movable from two sides under pressure of 10-30 MPa and at temperatures of 1850-2000 ° C.
- the heating rates were between 100 and 200 ° C / min.
- the holding times were between 10 and 20 minutes.
- the cooling rates were in the range of 100-200 ° C / min.
- the resulting shaped grains were clamped in a tool holder and fastened in the steel holder of a lathe.
- Various steels, including austenites, were machined with the cutting inserts.
- Al 2 O 3 was processed with the same arrangement, whereby both large-area removal and cuts were achieved. In addition, TaC and TiN surfaces could be removed.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Ceramic Products (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19860105056 EP0204920B1 (de) | 1985-06-01 | 1986-04-12 | Formkörper mit hoher Härte und hoher Zähigkeit für die Bearbeitung von Metallen, Hartmetallen, Keramiken und Gläsern |
| DE8686105056T DE3662153D1 (en) | 1985-06-01 | 1986-04-12 | Article with a high hardness and high tenacity for working metals, hard metals, ceramics and glasses |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3519710 | 1985-06-01 | ||
| DE19853519710 DE3519710A1 (de) | 1985-06-01 | 1985-06-01 | Formkoerper mit hoher haerte und hoher zaehigkeit fuer die bearbeitung von metallen, hartmetallen, keramiken und glaesern |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0204067A1 true EP0204067A1 (de) | 1986-12-10 |
Family
ID=6272213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86102025A Withdrawn EP0204067A1 (de) | 1985-06-01 | 1986-02-18 | Formkörper mit hoher Härte und hoher Zähigkeit für die Bearbeitung von Metallen, Hartmetallen, Keramiken und Gläsern |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4661155A (enrdf_load_stackoverflow) |
| EP (1) | EP0204067A1 (enrdf_load_stackoverflow) |
| JP (1) | JPS6230841A (enrdf_load_stackoverflow) |
| DE (2) | DE3519710A1 (enrdf_load_stackoverflow) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5039633A (en) * | 1989-09-14 | 1991-08-13 | The Dow Chemical Company | B4C/Al cermets and method for making same |
| US6478887B1 (en) | 1998-12-16 | 2002-11-12 | Smith International, Inc. | Boronized wear-resistant materials and methods thereof |
| US20060141237A1 (en) * | 2004-12-23 | 2006-06-29 | Katherine Leighton | Metal-ceramic materials |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH226062A (de) * | 1940-09-07 | 1943-03-15 | P Hoffmann Fred | Werkzeug zum Bohren, Drehen und dergleichen. |
| FR1015543A (fr) * | 1948-02-27 | 1952-10-14 | Plansee Metallwerk | Alliage fritté à base de carbure de bore |
| DE973807C (de) * | 1942-04-19 | 1960-06-09 | Beteiligungs & Patentverw Gmbh | Verfahren zur Herstellung von harten und verschleissfesten Gebrauchsgegenstaenden |
| FR2249854A1 (en) * | 1973-11-02 | 1975-05-30 | Borax Cons Ltd | Wear-resistant moulded jets and cutting-tools - prepd. from boron carbide mixt. with other refractory borides or carbides |
| FR2499102A1 (fr) * | 1981-02-03 | 1982-08-06 | Us Energy | Nouvelles compositions dures, melanges precurseurs et procedes pour leur preparation |
| GB2143847A (en) * | 1983-07-26 | 1985-02-20 | Us Energy | Hard material |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3178807A (en) * | 1961-10-05 | 1965-04-20 | Du Pont | Cermet of aluminum with boron carbide or silicon carbide |
| US3447921A (en) * | 1966-12-21 | 1969-06-03 | Gen Electric | Molybdenum-base alloy |
| AT300386B (de) * | 1970-02-16 | 1972-07-25 | Metallwerk Plansee Ag & Co Kom | Werkstoff für Strangpreßmatrizen |
| DE2809184A1 (de) * | 1977-03-09 | 1978-09-14 | Krebsoege Gmbh Sintermetall | Verfahren zur herstellung von harten, verschleissfesten werkstuecken |
| US4320204A (en) * | 1981-02-25 | 1982-03-16 | Norton Company | Sintered high density boron carbide |
| US4557893A (en) * | 1983-06-24 | 1985-12-10 | Inco Selective Surfaces, Inc. | Process for producing composite material by milling the metal to 50% saturation hardness then co-milling with the hard phase |
-
1985
- 1985-06-01 DE DE19853519710 patent/DE3519710A1/de active Granted
-
1986
- 1986-02-18 EP EP86102025A patent/EP0204067A1/de not_active Withdrawn
- 1986-04-12 DE DE8686105056T patent/DE3662153D1/de not_active Expired
- 1986-05-21 US US06/865,477 patent/US4661155A/en not_active Expired - Fee Related
- 1986-05-30 JP JP61123830A patent/JPS6230841A/ja active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH226062A (de) * | 1940-09-07 | 1943-03-15 | P Hoffmann Fred | Werkzeug zum Bohren, Drehen und dergleichen. |
| DE973807C (de) * | 1942-04-19 | 1960-06-09 | Beteiligungs & Patentverw Gmbh | Verfahren zur Herstellung von harten und verschleissfesten Gebrauchsgegenstaenden |
| FR1015543A (fr) * | 1948-02-27 | 1952-10-14 | Plansee Metallwerk | Alliage fritté à base de carbure de bore |
| FR2249854A1 (en) * | 1973-11-02 | 1975-05-30 | Borax Cons Ltd | Wear-resistant moulded jets and cutting-tools - prepd. from boron carbide mixt. with other refractory borides or carbides |
| FR2499102A1 (fr) * | 1981-02-03 | 1982-08-06 | Us Energy | Nouvelles compositions dures, melanges precurseurs et procedes pour leur preparation |
| GB2143847A (en) * | 1983-07-26 | 1985-02-20 | Us Energy | Hard material |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3519710A1 (de) | 1986-12-04 |
| DE3519710C2 (enrdf_load_stackoverflow) | 1987-06-25 |
| JPS6230841A (ja) | 1987-02-09 |
| DE3662153D1 (en) | 1989-03-30 |
| US4661155A (en) | 1987-04-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH FR GB IT LI SE |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19870511 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HEINZEL, VOLKER, DR. Inventor name: SCHUB, INGEBORG Inventor name: KESCHTKAR, HOSSEIN-ALI, DR. |