• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE0802601A1
    申请号:SE0802601
    申请日:2008-12-18
    公开日:2010-06-19
    发明作者:Mattias Puide；Per Jonsson
    申请人:Seco Tools Ab；
    IPC主号:
    专利说明:

    Injection molding is performed using the mixed mass. The material is heated to 100-240 ° C and then pressed into a cavity of the desired shape. The part thus obtained is cooled and then removed from the cavity. 3. Removal of the binders from the obtained part. The removal can be done by extracting the details in a suitable solvent and / or by heating in an oven with a suitable atmosphere.
    This step is often referred to as the stripping step. 4. Sintering of the details. Common cemented carbide sintering processes are used.
    The degree of filling of the pulp, q), is the volumetric amount of hard constituents compared to organic constituents. (1) can be calculated using the following equation: pf-pv -A-A where ps is the density of the cemented carbide sintered, pv is the average density of the organic constituents and pf is the density of the pulp, measured by helium pycnometer.
    The viscosity of the pulp is affected by the viscosity of the organic binder phase. The viscosity of the organic binder phase is closely related to the green strength of the material. A low green strength can cause the parts to crack during the extraction, where the expansion of the wax during melting causes tension in the part. Another disadvantage of a low green strength is that the details can be damaged during handling. A high green strength of the material means a high viscosity for the organic binder phase.
    In the case of a high viscosity, problems with pre-filling, extensive pre-wear, welding lines, which can be opened during sintering, and form cracks and surface damage as well as mold release problems can occur.
    It is an object of the present invention to provide a material with a lower viscosity of the pulp without sacrificing the green strength.
    It has now surprisingly been found that using a raw material for the metallic binder phase granulated with a wax, the pulp exhibits a significantly lower viscosity during injection molding without sacrificing the green strength.
    The method of the present invention comprises the following steps: 1) Wet grinding of the raw material, i.e. powder of hard constituents and metallic binder phase, granulated with a non-polar wax, preferably paraffin wax, in water or spirits or a combination thereof, preferably 80% by weight ethanol and 20% by weight of water, together with 0.1-1.2% by weight, preferably 025-055% by weight of carboxylic acid, preferably stearic acid, as a granulating agent for the subsequent drying. More carboxylic acid is needed the smaller the grain size of the hard constituents 2) Drying of the slurry formed during the above mentioned wet milling process step. 3) Mix the dried powder by kneading with a binder system, consisting of 30-60% by weight of olefinic polymers and 40-70% by weight of non-polar wax. The mixing is carried out in a batch mixer or twin screw extruder, heated to 50-200 ° C to form pellets with a size of approximately 4x4 mm. 4) Injection molding of the mass in a conventional injection molding machine. The material is turned to 100-240 ° C, preferably 120-140 ° C, and then pressed into a cavity of the desired shape. The resulting part is cooled and then removed from the cavity. 5) Stripping the obtained detail one. The stripping is performed in two steps. 5a) By extraction of the wax in a non-polar solvent, at 31-70 ° C, preferably at 31-55 ° C.
    It is within the skill of the artisan to determine by experiment the conditions necessary to avoid the formation of cracks and other damage according to this specification. 5b) By heating in an oven, preferably in an atmosphere of flowing gaseous medium at 2 mbar to atmospheric pressure up to 450 ° C. It is within the competence of the person skilled in the art to determine by experiment the conditions necessary to avoid the formation of cracks and other damage according to this specification. 6) Pre-sintering the part in the stripping oven in vacuo at 900-1250 ° C, preferably at about 1200 ° C. 7) Sintering the details using conventional sintering technique.
    The invention can be used for all cemented carbide compositions and all commonly used WC grain sizes as well as for titanium carbonitride based material.
    Example 1 (Comparative) A WC-13 wt% Co submicron cemented carbide powder was made by wet grinding 780 g of PEG-granulated Co-powder (OMG extra fine, granulated with 2% PEG), 38.66 g of Cr g WC (HC Starck DS80), 20.44 g W metal powder, 16 g Fisher-Tropsch wax (Sasol H1) and 22 g stearic acid in 1.6 l grinding fluid consisting of ethanol and water (80:20 wt) for 40 hours. The stearic acid is added at this stage of the process to act as a granule-forming agent in spray drying the slurry. The resulting slurry was spray dried to a granular powder.
    Example 2 (Invention) A WC-13 wt% Co submicron cemented carbide powder was made by wet grinding 780 g Wax granulated Co powder (OMG extra fine, granulated with 1.5% paraffin wax), 38.66 g CrgCg (HC Starck), 5161 g WC (HC Starck DS80), 20.44 g W metal powder, 16 g Fisher-Tropsch wax (Sasol H1) and 22 g stearic acid in 1.6 l grinding fluid consisting of ethanol and water (80:20 wt) for 40 hours . The stearic acid is added at this stage of the process to act as a granule-forming agent in spray drying the slurry.
    The resulting slurry was spray dried to a granular powder.
    Example 3 (Comparative) The powder prepared in Example 1 was mixed by kneading 2500 g of powder from Example 1 with 50.97 g of poly (ethylene-co- (alpha-octene)) having a Mooney viscosity of 16 ml at 121 ° C according to ASTM D- 1646 (Engage 8440, Dow Plast) and 45.87 g Paraffin wax (Sasol Wax) and 5.06 g petroleum jelly (Merkur 4 VARA AB) in a Z-blade kneading mixer (Werner & P fl eiderer LUK 1.0). This resulted in a mass with a density of 8.23 g / ml, corresponding to a q) of 0.553.
    Example 4 (Comparative) The powder prepared in Example 1 was mixed by kneading 2500 g of powder from Example 1 with 50.97 g of poly (ethylene-co- (alpha-octene)) having a Mooney viscosity of 10 ml at 121 ° C according to ASTM D- 1646 (Engage 8440, Dow Plast) and 45.87 g Paraffin wax (Sasol Wax) and 5.06 g petroleum jelly (Merkur VARA AB) in a Z-blade kneading mixer (Wemer & P fl eiderer LUK 1.0). This resulted in a mass with a density of 8.23 g / ml, corresponding to one (j) of 0.553.
    Example 5 (Invention) The powder prepared in Example 2 was mixed by kneading 2500 g of powder from Example 1 with 51.87 g of poly (ethylene-co- (alpha-octene)) having a Mooney viscosity of 16 ml at 121 ° C according to ASTM D- 1646 (Engage 8440, Dow Plast) and 45.87 g Paraffin wax (Sasol Wax) and 5 .06 g petroleum jelly (Merkur VARA AB) in a Z-blade kneading mixer (Werner & P fl eiderer LUK 1.0). This resulted in a mass with a density of 8.23 g / ml, corresponding to a q) of 0.553.
    Example 6 (Comparative) The pulp prepared in Example 3 was fed into an injection molding machine (Battenfeld HM 60/130/22). The machine was used for injection molding of a Seco Tools Minimaster 10 mm pimery milling green body. The injection molding pressure was 39.8 MPa at an injection molding speed of 15 ml / s. The green bodies had sufficient green strength for handling without being damaged.
    Example 7 (Comparative) The pulp prepared in Example 4 was fed into an injection molding machine (Battenfeld HM 60/130/22). The machine was used for injection molding of a Seco Tools Minimaster 10 mm pimery milling green body. The injection molding pressure was 35.1 MPa at an injection molding speed of 15 ml / s. The green bodies must be handled with care so as not to damage them.
    Example 8 (Invention) The pulp made in Example 5 was fed into an injection molding machine (Battenfeld HM 60/130/22). The machine was used for injection molding of a Seco Tools Minimaster 10 mm pimifräs green body. The injection molding pressure was 34.8 MPa at an injection molding speed of 15 ml / s. The green bodies had sufficient green strength for handling without being damaged.
    Example 9 The details of Example 6, Example 7 and Example 8 were stripped by extraction in carbon dioxide under supercritical conditions, i.e. at 35 MPa and 58 ° C for 20 hours. After the extraction, the details were inspected. The details of Examples 6 and 8 showed no surface cracks or other damage. The details from Example 7 showed small cracks visible with an optical microscope at 50 x magnification.
    权利要求:
    Claims (2)
    [1]
    A method for the production of tungsten carbide-based cemented carbide or cermet tools or components using a powder injection method comprising mixing cementitious powders and a metallic binder powder with an organic binder system consisting of 30-60% by weight of olefinic polymers and 40-70% by weight of non-polar , acting as a carrier for the powder characterized by the use of a metallic binder powder granulated with a non-polar wax.
    [2]
    Method according to claim 1, characterized in that said non-polar wax is a paraffin wax. Summary of the Invention The present invention relates to a method of producing tungsten carbide-based hardwood numbers or cermet tools or components using a powder injection molding method comprising mixing hardwood powder and a metallic binder phase powder with an organic binder system, consisting of 30-60% by weight of olefinic polymers and 40% by weight. -70% by weight of non-polar wax, acting as a carrier for the powder. According to the invention, a metallic binder powder granulated with a non-polar wax is used.
    类似技术:
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    同族专利:
    公开号 | 公开日
    CN102256728B|2013-09-04|
    CN102256728A|2011-11-23|
    KR20110110120A|2011-10-06|
    SE533922C2|2011-03-01|
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    EP2379253A1|2011-10-26|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    US4886638A|1989-07-24|1989-12-12|Gte Products Corporation|Method for producing metal carbide grade powders|
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    WO1991004119A1|1989-09-14|1991-04-04|Sumitomo Electric Industries, Ltd.|Method of producing cemented carbide or cermet alloy|
    US5045277A|1990-09-10|1991-09-03|Gte Products Corporation|Method of producing metal carbide grade powders and controlling the shrinkage of articles made therefrom|
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    US6843824B2|2001-11-06|2005-01-18|Cerbide|Method of making a ceramic body of densified tungsten carbide|
    CN1583328A|2004-06-16|2005-02-23|成都邦普合金材料有限公司|Hard alloy formation by low-pressure injection|
    FR2903415B1|2006-07-07|2011-06-10|Commissariat Energie Atomique|PROCESS FOR MANUFACTURING A MASTER MIXTURE FOR INJECTION OR EXTRUSION MOLDING|
    DE102006045339B3|2006-09-22|2008-04-03|H.C. Starck Gmbh|metal powder|
    CN100519010C|2007-10-17|2009-07-29|中南大学|Method of producing hard alloy rotatable special-shaped blade|
    SE532448C2|2007-11-01|2010-01-19|Seco Tools Ab|Ways to manufacture cemented carbide products|
    JP2012509408A|2008-11-21|2012-04-19|セコツールズアクティエボラーグ|Method of manufacturing cemented carbide or cermet products|
    SE534191C2|2009-02-18|2011-05-24|Seco Tools Ab|Ways to manufacture cemented carbide products|
    KR101831754B1|2009-08-04|2018-02-23|알로메트 코포레이션|Tough coated hard particles consolidated in a tough matrix material|
    US20130064708A1|2010-04-20|2013-03-14|Seco Tools Ab|Method for producing cemented carbide products|
    EP2576102A4|2010-05-26|2017-05-10|Seco Tools Ab|Method for producing cemented carbide products|US20130064708A1|2010-04-20|2013-03-14|Seco Tools Ab|Method for producing cemented carbide products|
    EP2576102A4|2010-05-26|2017-05-10|Seco Tools Ab|Method for producing cemented carbide products|
    RU2019113090A|2014-04-24|2019-09-06|Сандвик Интеллекчуал Проперти Аб|METHOD FOR CREATING CERMET POWDER OR CEMENT CARBIDE|
    CN106031949A|2015-09-02|2016-10-19|洛阳新巨能高热技术有限公司|Preparation method of complex-shaped cemented carbide products|
    DE102016011096B3|2016-09-15|2018-02-15|H. C. Starck Tungsten GmbH|Novel tungsten carbide powder and its production|
    法律状态:
    2014-07-29| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE0802601A|SE533922C2|2008-12-18|2008-12-18|Ways to manufacture cemented carbide products|SE0802601A| SE533922C2|2008-12-18|2008-12-18|Ways to manufacture cemented carbide products|
    US13/140,642| US8951463B2|2008-12-18|2009-12-17|Method for making cemented carbide products|
    EP09833743.9A| EP2379253B1|2008-12-18|2009-12-17|Method of making cemented carbide products|
    CN2009801512273A| CN102256728B|2008-12-18|2009-12-17|Method of making cemented carbide products|
    JP2011542068A| JP2012512962A|2008-12-18|2009-12-17|Method for manufacturing cemented carbide products|
    PCT/SE2009/051441| WO2010071580A1|2008-12-18|2009-12-17|Method of making cemented carbide products|
    KR1020117013780A| KR101653014B1|2008-12-18|2009-12-17|Method of making cemented carbide products|
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