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    Producing sintered articles from thermoplastic compositions containing polyoxymethylene binder
    2.
    发明授权
    Producing sintered articles from thermoplastic compositions containing polyoxymethylene binder 失效
    由含有聚甲醛粘合剂的可成型热塑性组合物制造成形烧结制品的方法

    公开(公告)号：US5695697A

    公开(公告)日：1997-12-09

    申请号：US335044

    申请日：1994-11-07

    申请人： Peter Trubenbach ,  Graham Edmund McKee ,  Hans Wohlfromm

    发明人： Peter Trubenbach ,  Graham Edmund McKee ,  Hans Wohlfromm

    IPC分类号： C04B35/622 ,  B22F1/00 ,  B22F3/10 ,  B22F3/22 ,  C04B35/565 ,  C04B35/634 ,  C04B35/638 ,  C01B31/00

    CPC分类号： B22F3/225 ,  B22F1/0059 ,  B22F3/1025 ,  C04B35/565 ,  C04B35/634 ,  C04B35/63464 ,  C04B35/63488 ,  C04B35/638 ,  B22F2001/0066 ,  B22F2998/00

    摘要： The process for the producing improved shaped sintered articles by first shaping a) a mixture of a ceramic or metallic powder or mixtures thereof with a moldable thermoplastic composition containing b) a thermoplastic polyoxymethylene binder and c) a second moldable and essentially inert thermoplastic polymer having a melting point between 90.degree. and 220.degree. C., such as a polyether of bisphenol A and an aliphatic diol. The binder is then removed from the shaped article by exposure to a gaseous acid-containing atmosphere, preferably below its softening temperature, while the second inert thermoplastic polymer is retained as a source of elemental carbon in which the ceramic or metallic powder is finely dispersed. This retained polymer is then pyrolyzed under an inert gas at elevated temperatures of at least 600.degree. C. for conversion to a finely dispersed elemental carbon. The resulting pyrolyzed preformed product is then sintered to obtain the desired high density ceramic and/or metallic article as the final product in which elemental carbon is uniformly and finely distributed. The process provides a simpler and more easily controlled method of incorporating elemental carbon into the ceramic/metallic shaped and sintered product while also carefully controlling the initial shaping step to prevent any formaldehyde induced crosslinking in the thermoplastic binder composition.

    摘要翻译： 通过首先将a）陶瓷或金属粉末或其混合物与可成型的热塑性组合物的混合物（其包含b）热塑性聚甲醛粘合剂和c）第二可成型和基本上惰性的热塑性聚合物来生产改进的成型烧结制品的方法，所述热塑性聚合物具有 熔点在90〜220℃之间，如双酚A的聚醚和脂肪族二醇。 然后通过暴露于气态含酸气氛，优选低于其软化温度，从成型制品中除去粘结剂，同时将第二惰性热塑性聚合物作为陶瓷或金属粉末微细分散的元素碳源保留。 然后将该保留的聚合物在惰性气体中在至少600℃的升高的温度下热解，以转化为细分散的元素碳。 然后将所得热解的预制产品烧结以获得所需的高密度陶瓷和/或金属制品作为其中元素碳均匀且精细分布的最终产品。 该方法提供了将元素碳并入陶瓷/金属成形和烧结产品中的更简单且更容易控制的方法，同时还谨慎地控制初始成型步骤以防止热塑性粘合剂组合物中的任何甲醛诱导的交联。

    Process for producing components by powder injection molding
    3.
    发明授权
    Process for producing components by powder injection molding 有权
    通过粉末注射成型制造组件的方法

    公开(公告)号：US09403212B2

    公开(公告)日：2016-08-02

    申请号：US13472915

    申请日：2012-05-16

    申请人： Johan ter Maat ,  Martin Blömacher ,  Hans Wohlfromm

    发明人： Johan ter Maat ,  Martin Blömacher ,  Hans Wohlfromm

    IPC分类号： B22F3/10 ,  B22F3/22

    CPC分类号： B22F3/1021 ,  B22F3/225

    摘要： Process for producing a shaped metallic body from a thermoplastic composition by injection molding or extrusion to form a shaped part, removal of the binder and sintering, wherein a thermoplastic composition composed of a metal powder and a polymer mixture B1) and B2) based on a polyoxymethylene homopolymer or copolymer B1) is used as binder and to remove the binder a) the shaped part is treated with a solvent which extracts the binder component B2) from the shaped part and in which the binder component B1) is insoluble, b) the solvent is then removed from the shaped part by drying and c) the shaped part is treated thermally at from 140 to 200° C. in an oxygen-comprising atmosphere, as a result of which the binder component B1) is removed from the shaped part; and also a shaped metallic body which can be obtained in this way.

    摘要翻译： 通过注射成型或挤出从热塑性组合物制造成形金属体的方法以形成成形部件，去除粘合剂和烧结，其中由金属粉末和聚合物混合物B1）和B2）组成的热塑性组合物基于 聚甲醛均聚物或共聚物B1）用作粘合剂并除去粘合剂a）成型部分用从成型部分提取粘合剂组分B2）的溶剂处理，其中粘合剂组分B1）不溶，b） 然后通过干燥从成型部分除去溶剂，和c）成形部件在含氧气氛中在140〜200℃下热处理，由此将粘合剂组分B1）从成形部分除去 ; 并且还可以以这种方式获得的成形金属体。

    Metal powder injection molding material and metal powder injection molding method
    6.
    发明申请
    Metal powder injection molding material and metal powder injection molding method 审中-公开
    金属粉末注射成型材料和金属粉末注射成型法

    公开(公告)号：US20060099103A1

    公开(公告)日：2006-05-11

    申请号：US10533315

    申请日：2003-10-21

    申请人： Hans Wohlfromm ,  Raimund Felder ,  Johan Maat ,  Martin Blomacher

    发明人： Hans Wohlfromm ,  Raimund Felder ,  Johan Maat ,  Martin Blomacher

    IPC分类号： C22C1/05

    CPC分类号： B22F3/225 ,  B22F1/0059 ,  B22F2998/00 ,  B22F3/22

    摘要： A novel metal injection molding material contains a) from 40 to 70% by volume of metal powder, including at least 50% by weight, based on the total amount of metal, of an iron-containing powder, at least 90% by weight, based on the amount of this iron-containing powder, of the particles of which have an effective diameter of at least 40 micrometers, b) from 30 to 60% by volume of a thermoplastic binder and c) from 0 to 5% by volume of a dispersant and/or other assistants. This injection molding material is shaped by injection molding, the injection molded parts are freed from the binder and said parts freed from the binder are sintered.

    摘要翻译： 一种新颖的金属注射成型材料包含a）40至70体积％的金属粉末，包括至少50重量％，基于金属总量，含铁粉末至少90重量％ 基于该含铁粉末的有效直径为至少40微米的颗粒的量，b）30至60体积％的热塑性粘合剂，和c）0至5体积％的 分散剂和/或其它助剂。 该注射成型材料通过注射成型成形，注射成型部件脱离粘合剂，并且与粘合剂无关的部分被烧结。

    Sintered parts made of oxygen-sensitive non-reducible powders and their production by injection-molding
    8.
    发明授权
    Sintered parts made of oxygen-sensitive non-reducible powders and their production by injection-molding 失效
    由氧敏性不可还原粉末制成的烧结零件及其注塑成型

    公开(公告)号：US5604919A

    公开(公告)日：1997-02-18

    申请号：US684477

    申请日：1996-07-29

    申请人： Hans-Josef Sterzel ,  Hans Wohlfromm

    发明人： Hans-Josef Sterzel ,  Hans Wohlfromm

    IPC分类号： C04B35/64 ,  B22F3/10 ,  B22F3/22 ,  C04B35/638 ,  F27D3/12 ,  B22F3/16

    CPC分类号： B22F3/225 ,  B22F3/10 ,  B22F3/1021 ,  B22F3/22 ,  C04B35/638 ,  B22F2998/00

    摘要： The preferred sintered parts made of oxygen-sensitive, non-reducible powders and their production by injection-molding are distinguished by the powders used being freed of their oxide layer by attritor milling in a water-free organic solvent, in the presence or absence of an additional reductant, the oxide particles being removed if necessary by filtration or screening in the presence of the organic solvent, the oxide-free powder being mixed as suspension with a polyacetal as binder under a protective gas, the organic solvent being distilled off, the mixture of powder and polyacetal being heated above the melting point of the polyacetal and being compounded to give a homogeneous composition, the granular material thus obtained being processed in an injection-molding machine made inert with argon to give shaped bodies, the shaped bodies being freed of binder under the action of oxalic acid in a closed ceramic container which nevertheless allows pressure equilibration under protective gas at atmospheric pressure or reduced pressure, the shaped bodies being, after binder removal, transferred in their container without contact with air into a sintering furnace and being sintered therein according to the prior art.

    摘要翻译： 由氧敏感的，不可还原的粉末制成的优选的烧结部件及其通过注射成型的制造的区别在于，在无水的有机溶剂中，通过在无水的有机溶剂中研磨而将其氧化物层除去的粉末在存在或不存在 另外的还原剂，如果需要，氧化物颗粒在有机溶剂存在下通过过滤或筛选除去，将无氧化物粉末作为悬浮液与聚缩醛作为粘合剂在保护气体下混合，将有机溶剂蒸馏掉， 粉末和聚缩醛的混合物被加热到聚缩醛的熔点以上并且被混合以得到均匀的组合物，所得到的颗粒材料在用氩气惰性的注射成型机中加工，得到成形体，成形体被释放 的粘合剂在草酸的作用下在封闭的陶瓷容器中，但仍然允许在保护ga下的压力平衡 在大气压或减压下，成型体在除去粘合剂之后转移到其容器中而不与空气接触进入烧结炉中，并根据现有技术在其中烧结。