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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。
    • 3. 发明授权
    • Production method of steel pipe excellent in corrosion resistance and
weldability
    • 耐腐蚀性和焊接性优良的钢管生产方法
    • US5820703A
    • 1998-10-13
    • US750758
    • 1996-12-13
    • Yasushi SuzukiMasaaki ObataAkihiro Miyasaka
    • Yasushi SuzukiMasaaki ObataAkihiro Miyasaka
    • C21D8/10C21D8/02C21D9/08C22C38/00C22C38/38C22C38/58
    • C21D8/0205C22C38/00C21D2211/008C21D8/105
    • A steel pipe having excellent corrosion resistance in an environment containing wet carbon dioxide and a small amount of hydrogen sulfide and having also excellent weldability is produced at a low production cost and with high productivity. The production method comprises heating to a temperature of 1,050.degree. to 1,300.degree. C. a slab containing, in terms of wt %, 0.01 to less than 1.2% of Si, 0.02 to 3.0% of Mn, 7.5 to 14.0% of Cr and 0.005 to 0.5% of Al, reduced C, N, P and S contents, at least one of Cu, Ni, Co, Mo and W, a balance of Fe and unavoidable impurities, and having an MC value of at least 0, finishing hot rolling within an austenite monophase temperature range, coiling the steel sheet as a hot coil having a sheet thickness of 3.0 to 25.4 mm, cooling the coil at a cooling rate of at least 0.01.degree. C./sec to at least 500.degree. C. to convert the steel sheet to a steel substantially consisting of martensite, reheating the steel to a temperature of 550.degree. C. to not more than an A.sub.c1 transformation point, holding it for at least 15 minutes, cooling the steel web to a normal temperature, cutting it into a predetermined width, and welding both ends of the steel by electric resistance welding while the steel coil is continuously shaped into a cylindrical shape.
    • 在生产成本低,生产率高的条件下,生产含有湿二氧化碳和少量硫化氢,焊接性优异的环境中具有优良耐腐蚀性的钢管。 该制造方法包括将其加热至1050℃〜1300℃的温度,以重量%计含有Si:0.01〜1.2%,Mn:0.02〜3.0%,Cr:7.5〜14.0%,0.005 至0.5%的Al,C,N,P和S含量降低,Cu,Ni,Co,Mo和W中的至少一种,余量的Fe和不可避免的杂质,MC值至少为0,热处理 在奥氏体单相温度范围内轧制,将钢板卷绕成板厚为3.0〜25.4mm的热卷材,以至少0.01℃/秒的冷却速度将线圈冷却至至少500℃至 将钢板转化为基本上由马氏体组成的钢,将钢再加热到550℃至不超过Ac1相变点,保持至少15分钟,将钢网冷却至常温,切割 在规定的宽度内,通过电阻焊接将钢的两端焊接在钢卷上 细致成型为圆柱形。
    • 5. 发明授权
    • Production method for steel material and steel pipe having excellent
corrosion resistance and weldability
    • 具有优异的耐腐蚀性和焊接性的钢材和钢管的生产方法
    • US5849116A
    • 1998-12-15
    • US765949
    • 1997-01-15
    • Akihiro MiyasakaMasaaki ObataTakashi Motoyoshi
    • Akihiro MiyasakaMasaaki ObataTakashi Motoyoshi
    • C21D8/00C21D8/10C22C38/20C21D8/02
    • C21D8/105C21D8/005C22C38/20
    • A steel material and a steel pipe each exhibiting an excellent corrosion resistance in an environment containing a wet carbon dioxide and a small amount of hydrogen sulfide are produced at low cost and with high productivity, a steel slab which contains, in wt %, 0.01 to 0.6% of Si, 0.02 to 1.8% of Mn, 7.5 to 14.0% of Cr, 1.5 to 4.0% of Cu and 0.005 to 0.1% of Al, which reduces C to not more than 0.02%, N to not more than 0.02%, P to not more than 0.025% and S to not more than 0.01%, and whose balance consists of Fe and unavoidable impurities, is heated to a temperature of 1,100.degree. to 1,300.degree. C., hot rolling is finished at a rolling finish temperature of not less than 800.degree. C. and a cumulative rolling reduction quantity at a temperature not more than 1,050.degree. C. is at least 65%, and cooling is carried out at a cooling rate of less than 0.02.degree. C./sec to at least 500.degree. C. so as to substantially convert the metallic structure to ferrite.
    • PCT No.PCT / JP95 / 01428 Sec。 371日期1997年1月15日 102(e)日期1997年1月15日PCT提交1995年7月18日PCT公布。 公开号WO96 / 02678 日期1996年2月1日在低成本,高生产率下,在含有湿二氧化碳和少量硫化氢的环境中显示出优异的耐腐蚀性的钢材和钢管, ,0.01〜0.6%的Si,0.02〜1.8%的Mn,7.5〜14.0%的Cr,1.5〜4.0%的Cu和0.005〜0.1%的Al,将C降低到0.02%以下,N〜 不超过0.02%,P不大于0.025%,S至不大于0.01%,余量由Fe和不可避免的杂质组成,加热至1100〜1300℃,热轧完成 在不低于800℃的轧制终轧温度下,在不高于1050℃的累积压下量为至少65%,冷却速度小于0.02℃ 从而将金属结构基本上转化为铁素体。