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1. 发明专利

JPH0348266B2 失效
公开(公告)号：JPH0348266B2
公开(公告)日：1991-07-23
申请号：JP6569883
申请日：1983-04-15
申请人： NIPPON KOKAN KK
发明人： ISHIGURO HIROHISA , NAKAGAWA KEIICHI , SHIMOMURA HIROAKI
IPC分类号： C23C8/24 , C23C8/06

2. 发明专利

JPH01279731A PRODUCTION OF FERROCHROME WITH VERY LOW NITROGEN AND CARBON CONTENT 失效
公开(公告)号：JPH01279731A
公开(公告)日：1989-11-10
申请号：JP10957488
申请日：1988-05-02
申请人： NIPPON KOKAN KK
发明人： KAWASAKI KIYOSHI , YANO YUTAKA , YAMAGISHI KAZUO , NAKAGAWA KEIICHI
IPC分类号： C22C33/04
摘要： PURPOSE:To obtain ferrochrome with very low nitrogen and carbon contents by charging granular or lumpty low-carbon ferrochrome into a vacuum heating furnace and carrying out high temp. treatment. CONSTITUTION:A vacuum heating furnace is charged with granular or lumpy low-carbon ferrochrome. At this time, the degree of vacuum is maintained at

3. 发明专利

JPH01226732A HOLLOW SPHERICAL STABILIZED ZIRCONIA AND PRODUCTION THEREOF 失效
公开(公告)号：JPH01226732A
公开(公告)日：1989-09-11
申请号：JP5096988
申请日：1988-03-04
申请人： NIPPON KOKAN KK
发明人： SATO RITSUO , NAKAGAWA KEIICHI , SHIMOMURA HIROAKI
IPC分类号： C01G25/02
摘要： PURPOSE:To efficiently produce hollow spherical stabilized zirconia satisfying prescribed conditions by adding a stabilizer to baddeleyite ore, melting them and blowing air on the resulting molten slag to scatter the slag. CONSTITUTION:A stabilizer is added to beddeleyite ore and they are melted. When the resulting molten slag is discharged, air is blown on the slag to scatter and sphere the slag. Hollow spherical stabilized zirconia having 0.5-5mm diameter and 0.8-2.1g/cm bulk specific gravity is efficiently produced.

4. 发明专利

JPH01188479A PRODUCTION OF SILICON NITRIDE POROUS BODY 失效
公开(公告)号：JPH01188479A
公开(公告)日：1989-07-27
申请号：JP1229988
申请日：1988-01-22
申请人： NIPPON KOKAN KK
发明人： KATO YOSHINORI , NISHIO HIROAKI , YABUTA KAZUYA , NAKAGAWA KEIICHI
IPC分类号： C04B35/626 , C04B35/58 , C04B35/591 , C04B38/00
摘要： PURPOSE:To produce a silicon nitride porous body which has high gas permeability and mechanical strength and is suitable for a solid target by mixing silicon powder of a specific grain size and silicon nitride of a specific grain size distribution at a specific ratio and molding the mixture, then subjecting the molding to a nitriding treatment. CONSTITUTION:10-75wt.% silicon powder of

5. 发明专利

JPH01177332A MANUFACTURE OF FERROCHROME NITRIDE 失效
公开(公告)号：JPH01177332A
公开(公告)日：1989-07-13
申请号：JP33688087
申请日：1987-12-29
申请人： NIPPON KOKAN KK
发明人： YANO YUTAKA , NAKAGAWA KEIICHI , KAWASAKI KIYOSHI
IPC分类号： C22C33/04
摘要： PURPOSE:To manufacture massive ferrochrome nitride contg. low oxygen in a high yield of nitrogen absorption by melting nitrogen-storing ferrochrome and low carbon ferrochrome in an induction furnace and adding a deoxidizer and flux to the molten metal for deoxidizing. CONSTITUTION:Massive low carbon ferrochrome is charged to a solid nitration heating furnace and nitrogen gas is introduced thereto while it is heated. The ferrochrome is subjected to a solid nitriding treatment to absorb nitrogen. Nitrogen-storing ferrochrome obtd. by this method and low carbon ferrochrome are charged to the induction furnace and are melted. The deoxidizer such as FSi or Al and the flux for deoxidizing such as CaF2-CaO-SiO2 are added to the molten metal. By this method, oxygen in the molten metal is reduced, slag is thereafter removed and the molten metal is cast into a mold. The ingot obtd. by this method is crushed to obtain a ferrochrome nitride alloy ingot of high quality contg. about

6. 发明专利

JPS63290668A PRODUCTION OF PREMELT FLUX FOR CONTINUOUS CASTING 失效
公开(公告)号：JPS63290668A
公开(公告)日：1988-11-28
申请号：JP12561087
申请日：1987-05-22
申请人： NIPPON KOKAN KK
发明人： NAKAGAWA KEIICHI , SHIMOMURA HIROAKI , SATO RITSUO
IPC分类号： B22D11/10 , B22D11/108 , B22D11/111
摘要： PURPOSE:To stabilize quality of premelt flux and to improve the yield by melting beforehand raw materials except Na2CO3 in an electric furnace and next adding the Na2CO3 to adjust the Na2CO3 content. CONSTITUTION:At the time of producing the flux containing 10-15 wt.% Na2O, 0.2-5% LiO2, 0.5-10% F,

7. 发明专利

JPS63274604A PRODUCTION OF SILICON NITRIDE POWDER 失效
公开(公告)号：JPS63274604A
公开(公告)日：1988-11-11
申请号：JP10802087
申请日：1987-05-01
申请人： NIPPON KOKAN KK
发明人： NAKAGAWA KEIICHI , SHIMOMURA HIROAKI , KATO YOSHINORI , SHIBUYA HIROYUKI
IPC分类号： C01B21/068 , C04B35/58 , C04B35/626
摘要： PURPOSE:To produce silicon nitride powder having large specific surface area, oxygen concn. controlled in a specified range and superior sinterability by crushing crude silicon nitride in a slurry of a specified concn. and acid treating in an aq. soln. of hydrofluoric acid. CONSTITUTION:The crude silicon nitride powder obtd. by nitriding metal silicon is crushed in a slurry of 40-60%, preferably 40-50%, concn. with a iron beads mill and acid-treated in the aq. soln. of hydrofluoric acid. In the acid-treatment, the concn. of hydrofluoric acid is 7-20wt.% and the condition of acid-treatment is preferably selected as satisfying a following equation. Equation: 2A>(100- slurry concn.) X (concn. of hydrofluoric acid in the aq. soln.)>A; where A=(SiO2 content in the solid component of the slurry, wt.%)X1.33X(the slurry concn. wt.%). After acid-treatment above-mentioned, the powder is washed with water. The temp. of the slurry when acid-treated and washed with water is preferably controlled in the range of 60-80 deg.C.

8. 发明专利

JPS63285171A PRODUCTION OF CHROMIA-ALUMINA REFRACTORIES 失效
公开(公告)号：JPS63285171A
公开(公告)日：1988-11-22
申请号：JP12066787
申请日：1987-05-18
申请人： NIPPON KOKAN KK
发明人： NAKAGAWA KEIICHI , SHIMOMURA HIROAKI , SATO RITSUO
IPC分类号： C04B35/657
摘要： PURPOSE:To obtain chromia.alumina refractories having high purity and low porosity at a low price, by charging chromium oxide powder and Al powder into an oven, melting the chromium oxide by aluminothermy, separating the chromium oxide from a metal chromium precipitated on the oven bottom in order to provide the chromia alumina melt. CONSTITUTION:An chromium oxide powder and aluminum powder are blended and charged into the reaction oven 1 as a raw material 4. Then a ignition agent 5 is put on the raw material 4 and ignited by a torch 6 and Al powder is fired to carry out aluminothermy reaction. Then the chromium oxide powder is melted by the reaction heat and part of the chromium oxide is reacted with Al to afford a metal chromium melt 7 and chromia alumina melt 8 and the metal chromium melt 7 is precipitated on the oven bottom by the difference of specific weight. Then melts 7 and 8 are solidified by gradually cooling and ingot of the chromia alumina is taken out to provide the aimed chromia.alumina refractories.

9. 发明专利

JPS6116728B2 JPS6116728B2 - 失效
公开(公告)号：JPS6116728B2
公开(公告)日：1986-05-01
申请号：JP13970581
申请日：1981-09-07
申请人： Nippon Kokan Kk
发明人： TAKAHATA KENJI , NAKAGAWA KEIICHI , SHIMOMURA HIROAKI , KATO YOSHINORI
IPC分类号： C01B33/00 , C01B21/068 , C01B21/082 , C30B29/62
CPC分类号： C01B21/068

10. 发明专利

JPS59193268A Operation of hermetically sealed nitriding oven 失效
标题翻译：人造密封硝酸盐的操作
公开(公告)号：JPS59193268A
公开(公告)日：1984-11-01
申请号：JP6569883
申请日：1983-04-15
申请人： Nippon Kokan Kk
发明人： ISHIGURO HIROHISA , NAKAGAWA KEIICHI , SHIMOMURA HIROAKI
IPC分类号： C23C8/24 , C23C8/06
CPC分类号： C23C8/06
摘要： PURPOSE:To obtain a product of good quality at a low cost while contriving efficient nitridation and making a treating time shorter, in performing solid- phase nitridation inside an oven, by controlling an initial nitriding speed, and replacing in-oven gas after the attainment of a specified nitriding ratio to enhance the nitriding speed. CONSTITUTION:A truck 2 on which a powdery raw material 1 such as pure metal or ferroalloy, e.g. ferrosilicon, is laminately piled up is introduced into a vacuum oven 3, said oven 3 is hermetically sealed, and a rotary pump 6 and a mechanical booster pump 7 are driven to perform exhaustion. Then, the interior of the oven 3 is heated up to a temp. necessary for nitriding treatment with a graphite heater 5, and N2 gas is introduced through an inlet opening 9 while closing a valve 8 to start nitridation. Hereon, the nitridation is performed while controlling an initial nitriding speed. When said nitriding ratio reaches 35-45%, the in-oven gas is exhausted. Thereafter, N2 gas is reintroduced to enhance the speed of nitriding reaction, and then the nitridation is completed.
摘要翻译：目的：通过控制初始氮化速度，在达到目标后，更换炉内气体，以低成本获得优质产品，同时进行有效氮化，缩短处理时间，在炉内进行固相氮化的氮化速率提高氮化速度。构成：一种卡车2，其上装有诸如纯金属或铁合金的粉末状原料1，例如层叠的硅铁被引入真空烘箱3中，所述烘箱3被气密地密封，并且驱动旋转泵6和机械增压泵7进行耗尽。然后，将炉3的内部加热至温度。需要用石墨加热器5进行氮化处理，并且通过入口9引入N 2气体，同时关闭阀8以开始氮化。此时，在控制初始氮化速度的同时进行氮化。当氮化比达到35-45％时，炉内气体耗尽。此后，再次引入N 2气体以提高氮化反应速度，然后进行氮化。

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