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    • 1. 发明授权
    • Method of producing silicon nitride ceramics having thermal high
conductivity
    • 具有导热性高的氮化硅陶瓷的制造方法
    • US5902542A
    • 1999-05-11
    • US766317
    • 1996-12-13
    • Kiyoshi HiraoKoji WatariMotohiro ToriyamaSyuzo KanzakiMasaaki Obata
    • Kiyoshi HiraoKoji WatariMotohiro ToriyamaSyuzo KanzakiMasaaki Obata
    • C04B35/584C04B35/593C04B35/638C04B35/64C04B35/645
    • C04B35/5935
    • The present invention provides silicon nitride ceramics having high thermal conductivity and a method for production thereof. This invention relates to a method for producing a silicon nitride sintered body having a microstructure with silicon nitride crystals oriented uniaxially and exhibiting high thermal conductivity of 100 to 150 W/mK in the direction parallel to the orientation direction of the crystals, which comprises of preparing a slurry by mixing a mixed powder of a sintering auxiliary, beta-silicon nitride single crystals as seed crystals and a silicon nitride raw powder with a dispersing medium, forming the slurry by tape casting or extrusion forming, calcining the formed silicon nitride body with beta-silicon nitride single crystals oriented parallel to the casting plane to remove the organic components, densifying it by hot pressing and the like if required, and further annealing it at 1700 to 2000.degree. C. under the nitrogen pressure of 1 to 100 atmospheres.
    • 本发明提供了具有高导热性的氮化硅陶瓷及其制造方法。 本发明涉及一种具有氮化硅结构的氮化硅烧结体的制造方法,该氮化硅烧结体具有在与晶体取向方向平行的方向上单轴取向并具有100〜150W / mK的高导热率的微结构, 通过将烧结助剂,β-氮化硅单晶的混合粉末作为晶种和氮化硅原料粉末与分散介质混合来形成浆料,通过带状流延或挤出成型形成浆料,用β - 氮化硅单晶,其平行于铸造平面取向以去除有机组分,如果需要,通过热压等来致密化,并且在1〜100个大气压的氮气压力下,在1700〜2000℃进一步退火。
    • 4. 发明申请
    • Low-carbon free cutting steel
    • 低碳自由切割钢
    • US20050025658A1
    • 2005-02-03
    • US10898963
    • 2004-07-27
    • Naoki MatsuiTakayuki NishiToru KatoKoji WatariTatsuya Hasegawa
    • Naoki MatsuiTakayuki NishiToru KatoKoji WatariTatsuya Hasegawa
    • C22C38/00C22C38/04C22C38/14C22C38/60
    • C22C38/02C22C38/04
    • The invention provides a low-carbon free cutting steel containing no lead and is at least comparable in machinability to the conventional leaded free cutting steels and composite free cutting steels and furthermore has excellent finished surface characteristics. The steel is a low-carbon free cutting steel which comprises, on the percent by mass basis, C: 0.05 to under 0.20%, Mn: 0.4-2.0%, S: 0.21-1.0%, Ti: 0.002-0.10%, P: 0.001-0.30%, Al: not higher than 0.2%, 0: 0.001-0:03% and N: 0.0005-0.02%, with the balance being Fe and impurities, and which satisfies the relations (a) and (b) given below concerning the inclusions contained in the steel: (A+B)/C≧0.8   (a), NA≧5   (b), wherein, A: the total area occupied by substantial MnS with Ti carbide and/or Ti carbonitride included therein among the inclusions not smaller than 1 μm in circle-equivalent diameter per mm2 of a cross section parallel to the direction of rolling; B: the total area occupied by substantial MnS with neither Ti carbide nor Ti carbonitride included therein among the inclusions not smaller than 1 μm in circle-equivalent diameter per mm2 of a cross section parallel to the direction of rolling; C: the total area occupied by all the inclusions not smaller than 1 μm in circle-equivalent diameter per mm2 of a cross section parallel to the direction of rolling; NA: the number of substantial MnS inclusions with Ti carbide and/or Ti carbonitride included therein among the inclusions not smaller than 1 μm in circle-equivalent diameter per mm2 of a cross section parallel to the direction of rolling.
    • 本发明提供一种不含铅的低碳自由切削钢,至少与常规的含铅自由切削钢和复合自由切削钢的切削性相当,并且还具有优异的成品表面特性。 该钢是低碳自由切削钢,以质量%计含有C:0.05〜0.20%以下,Mn:0.4〜2.0%,S:0.21〜1.0%,Ti:0.002〜0.10%,P :0.001-0.30%,Al:不高于0.2%,0:0.001-0:03%和N:0.0005-0.02%,余量为Fe和杂质,满足关系式(a)和(b) 对于包含在钢中的夹杂物:(A + B)/ C> = 0.8(a),NA> = 5(b),其中,A:实质MnS与Ti碳化物和/或Ti 夹杂物中包含的碳氮化物在与轧制方向平行的截面中每平方毫米的圆当量直径不小于1微米; B:平均于轧制方向的横截面的平均当量直径不小于1μm的夹杂物中不含Ti碳化物和Ti碳氮化物的实质MnS所占的总面积; C:与轧制方向平行的截面的每平方毫米的圆当量直径不小于1um的所有夹杂物占据的总面积; NA:夹杂物中含有Ti碳化物和/或Ti碳氮化物的实质MnS夹杂物的数量不小于平均于轧制方向的横截面的平均当量直径为1毫米2的横截面。