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1. 发明专利

JPH01299424A DAMAGE PREVENTING METHOD OF PROTECTIVE-TUBE TYPE METER FOR CONTINUOUS TEMPERATURE MEASUREMENT 失效
公开(公告)号：JPH01299424A
公开(公告)日：1989-12-04
申请号：JP12822788
申请日：1988-05-27
申请人： NIPPON STEEL CORP , ASAHI GLASS CO LTD
发明人： OHORI JUNJI , AZUMA YOSHIAKI , KIDA OTOJIRO , TAKEJI HIROSHI
IPC分类号： G01K1/08 , G01K1/14
摘要： PURPOSE:To prevent the local erosion of a protective tube and to enable the execution of continuous temperature measurement for a long time, by moving the protective tube upward and downward in a molten metal and by rotating the same around the axis in the longitudinal direction, on the occasion when a sensor for temperature measurement is dipped in the molten metal for measuring temperature. CONSTITUTION:A platinum-rhodium thermocouple is disposed inside a protective tube 1 whose main constituent is boride ceramics, and terminals of the thermocouple are connected to a meter by compensation conductors through the intermediary of a connection terminal box 5. At the time of dipping in a molten metal for measuring temperature, the protective tube 1 is moved upward and downward and rotated by a supporting device 6 which moves the protective tube 1 upward and downward and rotates it while supporting the terminal box 5 on the upper side of the protective tube 1. When the temperature of the molten metal is measured, molten slug floats much in the surface part of the molten metal and this part tends to be oxidized at high temperature. Therefore, erosion can be prevented by a means wherein the same position of the protective tube 1 is not located in the surface part of the molten metal for a long time. Thereby the local erosion of the protective tube is prevented and the execution of continuous temperature measurement for a long time is enabled.

2. 发明专利

JPH01288739A THERMOCOUPLE PROTECTIVE TUBE AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH01288739A
公开(公告)日：1989-11-21
申请号：JP11897288
申请日：1988-05-16
申请人： NIPPON STEEL CORP , ASAHI GLASS CO LTD
发明人： OHORI JUNJI , AZUMA YOSHIAKI , KIDA OTOJIRO , TAKEJI HIROSHI
IPC分类号： G01K1/08
摘要： PURPOSE:To achieve a stabilization of a continuous measurement of temperature of molten iron, by forming an oxide layer on the inner surface of non-oxide ceramics. CONSTITUTION:Air is introduced into a thermocouple protective tube 1 thermally treating the internal surface of the tube and a body 1a comprising non-oxide ceramics and when material of the body 1a is a ZrB2 compound containing SiC, Si and Zr of a surface part are oxidized to form an oxide layer 1b comprising SiO2 and ZrO2. The formation of the oxidation film eliminates again and disconnection of a thermocouple 2 under a prolonged use, thereby enabling continuous measurement of temperature of molten iron stably.

3. 发明专利

JPH0574014B2 失效
公开(公告)号：JPH0574014B2
公开(公告)日：1993-10-15
申请号：JP12822688
申请日：1988-05-27
申请人： SHINNIPPON SEITETSU KK , ASAHI GLASS CO LTD
发明人： AZUMA YOSHIAKI , MORI HIDEAKI , KIDA OTOJIRO , TAKEJI HIROSHI
IPC分类号： G01K1/08 , G01K7/02

4. 发明专利

JPH01288741A PROTECTIVE TUBE TYPE TEMPERATURE SENSOR 失效
公开(公告)号：JPH01288741A
公开(公告)日：1989-11-21
申请号：JP11897588
申请日：1988-05-16
申请人： NIPPON STEEL CORP , ASAHI GLASS CO LTD
发明人： AZUMA YOSHIAKI , SAWA MASAAKI , MURAYAMA YUKIO , OOTSUCHI YUKIO , KIDA OTOJIRO , TAKEJI HIROSHI
IPC分类号： G01K1/08 , G01K7/02
摘要： PURPOSE:To enable intermittent measurement of temperature of a molten metal, by arranging a refractory layer outside a thermocouple protective body. CONSTITUTION:A refractory layer 1b having a heat impact resistance, a higher anticorrosion and heat insulating property such as Al2O3-C or ZrO2-C is arranged on the external surface of a protective tube body 1a mainly composed of non- oxide based ceramics. With the covering of the layer 1b, an intermittent rise or drop of temperature is repeated to prevent a cracking loss of the body 1a, thereby enabling intermittent measurement of temperature of a molten metal stably for a long time.

5. 发明专利

JPH0473591A FURNACE BOTTOM ELECTRODE FOR ELECTRIC FURNACE 失效
公开(公告)号：JPH0473591A
公开(公告)日：1992-03-09
申请号：JP18060190
申请日：1990-07-10
申请人： ASAHI GLASS CO LTD
发明人： KIDA OTOJIRO , TAKEJI HIROSHI
IPC分类号： H05B7/06 , C04B35/58 , C21C5/52 , F27B3/08 , F27D11/08
摘要： PURPOSE:To ensure a contact pin excellent in conductivity, mechanical strength, and high-impact properties by incorporating the contact pin divided longitudi nally into a plurality of parts thereof, the contact pin being of zirconium boride ceramic. CONSTITUTION:A contact pin 12 is obtained by assembling the four division pins 30 of a fan-shaped (or square) cross section into a columnar shape (or pyramidal) as a whole, and binding the division pins. Further, zirconium ceramic is employed as the pin 12 of a furnace bottom electrode. Thereby, the pin 12 is reduced in wear speed in view of material quality, and is durable for a long period use with its life prolonged 10 times the conventional life. Further, for the structure of the pin, by dividing the pin 12 into a plurality partial pins each divided pin is made thin even though the diameter of the pin is large and uniform and dense texture formation is achievable to improve conductivity, mechanical strength, and high-impact properties.

6. 发明专利

JPH03156283A BOTTOM ELECTRODE FOR ELECTRIC FURNACE AND DC ELECTRIC FURNACE 失效
公开(公告)号：JPH03156283A
公开(公告)日：1991-07-04
申请号：JP29399689
申请日：1989-11-14
申请人： ASAHI GLASS CO LTD
发明人： KIDA OTOJIRO , TAKEJI HIROSHI
IPC分类号： C04B35/58 , C21C5/52 , F27B3/08 , F27D11/08
摘要： PURPOSE:To obtain a DC electric furnace having a bottom electrode of long life by providing a contact pin made of sintered zirconium boride and a prepared unshaped refractory material filled in the lower part of the pin, and providing a connector to a power source at the lower end of the pin. CONSTITUTION:A bottom electrode 11 is engaged with the center of the bottom of a DC electric furnace, a cable 17 of the electrode 11 is connected to an electrode terminal 15, which is connected to a current collector 14 through a metal cooling air introduction tube 15, and a board 13 is provided directly above the plate 14. A plurality of contact pins 12 made of conductive sintered zirconium boride are connected to be supported to the plate 14 through the board 13, and surrounded by a steel case 19. A prepared unshaped refractory material 18 is filled inside the case 19, and bodies of the pins 12 are buried in the material 18. When steel and iron are melted, scrap, sub material are charged in a furnace, and the electrode 11 and a graphite electrode are energized therebetween. Then, an arc is generated between the graphite electrode and the scrap, and the scrap is melted.

7. 发明专利

JPH01299423A PROTECTIVE-TUBE TYPE METER FOR CONTINUOUS TEMPERATURE MEASUREMENT 失效
公开(公告)号：JPH01299423A
公开(公告)日：1989-12-04
申请号：JP12822688
申请日：1988-05-27
申请人： NIPPON STEEL CORP , ASAHI GLASS CO LTD
发明人： AZUMA YOSHIAKI , MORI HIDEAKI , KIDA OTOJIRO , TAKEJI HIROSHI
IPC分类号： G01K1/08 , G01K7/02
摘要： PURPOSE:To enable the prolongation of the lifetime of a temperature measuring sensor, by a construction wherein a protective tube whose main constituent is alumina and an insulative tube are provided inside a protective tube whose main constituent is boride ceramics, and the sensor of which a heat-sensitive part in the tip end part is coated with platinum is disposed therein. CONSTITUTION:An internal protective tube 2 whose main constituent is alumina and an insulative tube 3 are provided inside a protective tube 1 whose main constituent is boride ceramics. Moreover, a platinum-rhodium thermocouple 5 fitted with platinum coating 4 is disposed at a temperature contact, and terminals of the thermocouple 5 are connected to a temperature recorder 7 by using compensation conductors 6. The protective tube 2 prevents the direct contact of the heat-sensitive part in the fore end of the thermocouple 5 with the protective tube 1 and also protects the entire thermocouple 5 from a reducing atmosphere by airtightness. In addition, the thermocouple 5 is protected by the platinum coating 4 for temperature measurement for a long time. By this construction, the deterioration of the thermocouple due to the reducing atmosphere is prevented and the execution of continuous temperature measurement for a long time is enabled.

8. 发明专利

JPH01288740A THERMOCOUPLE PROTECTIVE TUBE AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH01288740A
公开(公告)日：1989-11-21
申请号：JP11897488
申请日：1988-05-16
申请人： NIPPON STEEL CORP , ASAHI GLASS CO LTD
发明人： MORI HIDEAKI , AZUMA YOSHIAKI , KIDA OTOJIRO , TAKEJI HIROSHI
IPC分类号： G01K1/08
摘要： PURPOSE:To achieve prevention of the lowering of anticorrosion of a thermocouple protective tube and embrittlement in structure thereof, by forming a vitreous layer on the external surface of a sintered protection layer. CONSTITUTION:A coat of a slurry of refractory powder and a vitrified material is applied on the external surface of a sintered protective tube body 1a mainly composed of a non-oxide compound such as boride of Zr to form a vitreous layer 1b thermally treated. The formation of the vitreous layer 1b can suppress the oxidation of non-oxide ceramics which occurs in the preheating and measurement of temperature when a molten metal is fed with the ceramics, thereby enabling the prevention of the lowering of anticorrosion and embrittlement in structure thereof.

9. 发明专利

JPH04238869A ZIRCONIUM BORIDE UNBURNT REFRACTORY 失效
公开(公告)号：JPH04238869A
公开(公告)日：1992-08-26
申请号：JP41621990
申请日：1990-12-28
申请人： ASAHI GLASS CO LTD
发明人： KIDA OTOJIRO , TAKEJI HIROSHI
IPC分类号： C04B35/58 , C04B35/66
摘要： PURPOSE:To provide ZrB2 unburnt refractory suitably useful under a severe condition in contact with smelted ore such as hot metal or molten iron and liquid slag, having excellent corrosion resistance, normal-temperature and high- temperature strength, oxidation resistance, erosion resistance, etc. CONSTITUTION:Unburnt refractory of zirconium boride consisting essentially of 80-99wt.% refractory particles containing >=30wt.% ZrB2, adjusted to proper particle size and 1-20wt.% material of forming a bond part comprising mixed powder of ZrO2 and SiB6. ZrO2 and SiB6 in the material of forming a bond part are reacted at >=1,000 deg.C to produce a bond having high strength even at high temperature.

10. 发明专利

JPH01299422A PREVENTING METHOD OF DETERIORATION OF THERMOCOUPLE OF PROTECTIVE-TUBE TYPE METER FOR CONTINUOUS TEMPERATURE MEASUREMENT 失效
公开(公告)号：JPH01299422A
公开(公告)日：1989-12-04
申请号：JP12822588
申请日：1988-05-27
申请人： NIPPON STEEL CORP , ASAHI GLASS CO LTD
发明人： AZUMA YOSHIAKI , MORI HIDEAKI , KIDA OTOJIRO , TAKEJI HIROSHI
IPC分类号： G01K1/08
摘要： PURPOSE:To prevent the deterioration of a thermocouple and to improve the reliability, by a method wherein a reducing atmosphere produced from the inside of a protective tube protecting a sensor for temperature measurement and formed of boride ceramics is diffused and exhausted spontaneously or forcibly from an open end of the protective tube. CONSTITUTION:A platinum-rhodium thermocouple 2 is disposed inside a protective tube 1 whose main constituent is boride ceramics. A terminal box 5 connecting the thermocouple with a compensation conductor has an opening 6 and holds the upper part of the tube 1 in the lower part thereof, and a space having a diameter larger than the upper open end 11 of the tube 1 is provided in a holding part thereof. In the upper part of the terminal box 5, a connection terminal 7 and an air introduction element 8 for cooling the terminal are provided. Accordingly, a reducing atmosphere produced in the tube 1 is diffused effectively from the opening 6 of the terminal box 5, while the diffusion is conducted still more effectively by an exhausting effect of the air 9 for cooling the terminal. This constitution makes it possible to prevent the deterioration of the thermocouple and to improve the reliability.

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