• 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:SE0900216A1
    申请号:SE0900216
    申请日:2009-02-19
    公开日:2010-08-20
    发明作者:Jan Qvick
    申请人:Seco Tools Ab；
    IPC主号:
    专利说明:

    about 90% by weight of PEG and greater than about 10% by weight of long chain C> = 20 fatty acids, their esters and salts, in particular, erucic acid and / or behenic acid.
    It has now surprisingly been found that a conventional cemented carbide powder mixture with a reduced sintering shrinkage at a constant compression pressure can be made from powder mixtures made of a tungsten carbide with a relatively high Scott density.
    According to the invention there is now a granular cemented carbide powder mixture with the desired low sintering shrinkage and excellent pressing properties for inserts for metalworking comprising fine WC and 4-15% by weight Co, preferably 5-14% by weight Co, conventional pressing agents and any grain growth inhibitors such as <1 wt% Cr, preferably 0.2-0.6 wt% Cr, and / or <1 wt% V, preferably 0.2.-0.6 wt% V, and / or <1 wt% Ta and / or <1 wt% % Nb and / or <1% by weight of Ti.
    The fine-grained cemented carbide powder mixture has a sintering shrinkage of 16.8 to 17.9%, preferably within 17.0 to 17.7%, at a compression pressure of 150 MPa.
    The toilet powder has an FSSS grain size in the range 0.4-1.7 μm, preferably 0.5-1.5 μm. It has a relatively high Scott density (ISO 3923 Part 2) of 2.75-3.75 g / cm 3 and a compression density after dry pressing without pressing agent at 100 MPa within 8.8-9.8 g / cm 2, preferably 8.9-9.5 g / cm 3. The press density of the WC is determined by weighing and measuring the dimensions of the pressed body.
    The present invention also relates to a process for producing a cemented carbide powder with low sintering shrinkage and excellent pressing properties for inserts for metalworking comprising fine-grained WC and 4-15% by weight of Co, preferably 5-14% by weight of Co, conventional pressing agents and optionally grain growth inhibitors such as 1 wt% Cr, preferably 0.2-0.6 wt% Cr, and / or <1 wt% V, preferably 0.2-0.6 wt% V, and / or <1 wt% Ta and / or <1 wt% % Nb and / or <1% by weight of Ti by powder metallurgical technique wet grinding, dry pressing and sintering.
    The toilet powder has an FSSS grain size in the range 0.4-1.7 μm, preferably 0.5-1.5 μm. It has a relatively high Scott density (ISO 3923 Part 2) of 2.75-3.75 g / cm3 and a compression density after tone pressing without pressing agent at 100 MPa within 8.8-9.8 g / cm3, preferably 8.9-9.5 g / cm3.
    Example 1 Invention A granular cemented carbide powder having the composition WC-6 wt% Co, 0.3 wt% CrgCg, 2.0 wt% PEG 3400 and 0.5 wt% PEG 1500 was prepared. The Fisher Sub Sieve Sizer value for WC was 0.82 μm, the Scott density was 2.87 g / cm3 and the pressing density after dry pressing without pressing agent at 100 MPa was determined to be 9.04 g / cm3 by weighing and measuring the dimensions of the pressed body.
    The cemented carbide powder batch was spray dried and pressed into bodies of approximate size l5x15x7 mm at the standard pressure of 150 MPa. The bodies were sintered at 1430 ° C under standard sintering conditions. The exact dimensions of the bodies were determined before and after sintering.
    The linear shrinkage for the bodies was 17.4% and the coercivity 24.7 kA / m.
    Example 2 Prior Art Example 1 was repeated except that the WC had a Fisher Sub Sieve Sizer value of 0.81 μm, a Scott density of 2.31 g / cm 3 and a compression density after dry pressing without pressing agent at 100 MPa of 8.44 g / cm 3.
    The linear shrinkage for the bodies was 18.3% and the coercivity 24.9 kA / m.
    Example 3 Invention Example 1 was repeated except that the Co content was 13%.
    The linear shrinkage for the bodies was 17.3% and the coercivity 18.2 kA / m.
    Example 4 Prior Art Example 3 was repeated except that the WC had a Fisher Sub Sieve Sizer value of 0.81 μm, a Scott density of 2.31 g / cm 3 and a compression density after dry pressing without pressing agent at 100 MPa of 8.44 g / cmß.
    The linear shrinkage for the bodies was 18.3% and the coercivity 18.3 kA / m.
    Example 5 Invention A granular cemented carbide powder having the composition WC-6 wt% Co, 0.2 wt% TaC, 1.5 wt% PEG 3400 and 0.5 wt% PEG 1500 was prepared. Fisher Sub Sieve Sizer value for WC was 1.37 um. The bulk density was 2.99 g / cm 3 and the compression density after dry pressing without pressing agent at 100 MPa was determined to be 9.15 g / cm 3 by weighing and measuring the dimensions of the compact.
    The cemented carbide powder batch was spray dried and pressed into bodies of approximate size l5x15x7 mm at the standard pressure of 150 MPa. The bodies were sintered at 1430 ° C under standard sintering conditions. The exact dimensions of the bodies were determined before and after sintering.
    The linear shrinkage of the bodies was 17.2% and the coercivity 16.9 kA / m.
    Example 6 Prior Art Example 5 was repeated except that the WC had a Fisher Sub Sieve Sizer value of 1.42 μm, a Scott density of 2.38 g / crn3 and a pressing density after dry pressing without pressing agent at 100 MPa of 8.40 g / cnf.
    The linear shrinkage for the bodies was 18.2% and the coercivity 16.7 kA / m.
    Thus, Examples 1-6 show that the use of a fine-grained toilet powder with a relatively high bulk density and compression density gives a fine cemented carbide powder mixture with a low sintering shrinkage.
    权利要求:
    Claims (4)
    [1]
    Fine-grained cemented carbide powder mixture for inserts for metalworking, characterized in that the toilet powder has a bulk density of 2.75 ~ 3.75 g / cm 3, and a compression density after dry pressing at 100 MPa within 8.8-9.8 g / cm of 16.8 to 17.9% at a press pressure of 150 MPa.
    [2]
    The fine-grained cemented carbide powder mixture for inserts for metalworking according to claim 1, characterized in that it comprises a WC powder having an FSSS grain size of 0.4-1.7 μm and 4 to 15% by weight Co.
    [3]
    A method of making a fine-grained cemented carbide powder mixture for metalworking inserts is characterized by the use of a toilet powder having a bulk density of 2.75-3.75 g / cm 3 and a post-compression density of 100 MPa of 8.8-9.8 g / cm 3.
    [4]
    A method of making a fine-grained cemented carbide powder mixture for metalworking according to claim 3, characterized by the use of a toilet powder having an FSSS grain size of 0.4-1.7 μm and 4-15% by weight Co. Summary The present invention relates to a fine-grained cemented carbide powder mixture for metalworking inserts comprising WC powder having a bulk density of 2.75-3.75 g / cm 3 and a compression density after dry pressing at 100 MPa within 8.8-9.8 g / cm 3. The sintering shrinkage of the fine-grained cemented carbide powder mixture is 16.8 to 17.9% at a compression pressure of 150 MPa. The present invention also relates to a method of making the powder mixture.
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    同族专利:
    公开号 | 公开日
    EP2398927A1|2011-12-28|
    KR20110121614A|2011-11-07|
    US20110271605A1|2011-11-10|
    JP2012518091A|2012-08-09|
    CN102325914A|2012-01-18|
    WO2010096004A1|2010-08-26|
    EP2398927A4|2014-01-22|
    SE533912C2|2011-03-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3677722A|1969-11-24|1972-07-18|Walmet Corp The|Cemented carbide composition and method of preparation|
    US4320156A|1981-01-12|1982-03-16|Gte Products Corporation|Intimate mixtures of refractory metal carbides and a binder metal|
    SE518885C2|1998-02-20|2002-12-03|Seco Tools Ab|Ways to make inserts in submicron cemented carbide|
    SE519315C2|1999-04-06|2003-02-11|Sandvik Ab|Ways to make a low-pressure cemented carbide powder|
    JP2006045601A|2004-08-03|2006-02-16|Hitachi Tool Engineering Ltd|Hard powder and method for producing cemented carbide using the powder|
    SE529202C2|2005-05-17|2007-05-29|Sandvik Intellectual Property|Methods of manufacturing an agglomerated powder mixture of a slurry and agglomerated powder|
    SE529705C2|2005-06-27|2007-10-30|Sandvik Intellectual Property|Ways to make a powder mixture for cemented carbide|
    SE529297C2|2005-07-29|2007-06-26|Sandvik Intellectual Property|Ways to make a submicron cemented carbide powder mixture with low compression pressure|
    法律状态:
    2014-09-30| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE0900216A|SE533912C2|2009-02-19|2009-02-19|Fine-grained cemented carbide powder mixture with low sintering shrinkage and method of manufacturing the same|SE0900216A| SE533912C2|2009-02-19|2009-02-19|Fine-grained cemented carbide powder mixture with low sintering shrinkage and method of manufacturing the same|
    CN2010800087024A| CN102325914A|2009-02-19|2010-02-16|Fine grained cemented carbide powder mixture with low sintering shrinkage and method of making same|
    PCT/SE2010/050178| WO2010096004A1|2009-02-19|2010-02-16|Fine grained cemented carbide powder mixture with low sintering shrinkage and method of making the same|
    US13/145,117| US20110271605A1|2009-02-19|2010-02-16|Fine grained cemented carbide powder mixture with low sintering shrinkage and method of making the same|
    JP2011551037A| JP2012518091A|2009-02-19|2010-02-16|Fine-grain cemented carbide powder mixture having low sintering shrinkage and method for producing the same|
    KR1020117018265A| KR20110121614A|2009-02-19|2010-02-16|Fine grained cemented carbide powder mixture with low sintering shrinkage and method of making the same|
    EP10744021.6A| EP2398927A4|2009-02-19|2010-02-16|Fine grained cemented carbide powder mixture with low sintering shrinkage and method of making the same|
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