- Email: [email protected]
Vacuum apparatus from Japan
Vacuum news another push-button is used to stop the fan, and, after a suitable delay, to close the radiation screens. Air can then be admitted to the chamber and the lid opened for the removal of the charge. The installation was supplied complete with pressure gauges, automatic temperature control and a three-point temperature recorder, all housed in the separate floor-standing cubicle.
Efco Furnaces Limited, UK Circle number 62 on Reader Enquiry Service card
Vacuum precision-casting plant A new type of vacuum precision-casting plant, VSG 50 P, is being developed and introduced by Balzers A G of Leichtenstein. The design is such that the main horizontal chamber remains constantly under vacuum whilst the furnace is in operation and complete continuity is provided by two lock chambers.
Vacuum precision-casting plant VSG 50 P A retractable immersion thermocouple allows the temperature of the melt to be measured as often as required and the thermo-element can also be changed without interruption of the vacuum. A second, larger lock (shown open in the Figure) has a diameter of 500 mm, which allows moulds pre-heated to 1000 ° to 1200°C to be fed into the main chamber so that casting can take place. The complete loading and casting cycle, including mounting the mould on the swivel mould platform, closing of the lock cover, evacuation of the lock, opening of the lock valve, swinging in of the mould, teeming, swinging back of the mould and casting, closing of the lock valve and admitting air to the lock can be completed in less than 3 minutes. Thus floor-to-floor times for casting of 8 to 10 minutes are easily achieved. The main chamber can be evacuated to 10-5 torr in less than 6 minutes and the pumping down of the lock chamber takes 45 seconds. An MF-Unit with a rated capacity of 100 kW normally provides the power for melting, the current being fed to the coil via a rotary contact, so that the use of cables is entirely avoided. A pre-fabricated crucible that can be changed in about 10 minutes is normally utilized for melting. A water-cooled condensation surface in the main chamber above the melting crucible, ensures that the inner walls of the chamber remain practically free from metal condensate. The condenser is readily changeable and can be quickly cleaned inside or outside the plant, whichever is found to be the more convenient. The plant can also be provided with a mould turntable and by a simple adaption can be used for ingot casting, where, for example, the customer is interested in recovering scrap material for remelting into bar stock. For such work a crucible having a maximum capacity of 50 kg of steel can be used. The operating sequences are to a large degree automatic and fully interlocked so that errors in operation are practically impossible. The over-all height of the unit is 2650 mm and the total space requirement including the power supply unit is 2.5 × 2.5 m. Balzers A G, Leichtenstein Circle number 63 on Reader Enquiry Service card
554
Vacuum apparatus from Japan The Japan Vacuum Engineering Company have recently introduced a new high-temperature vacuum furnace, a new high-vacuum coater, a range of oil diffusion pumps and several ultra-high-vacuum system accessories. High-temperature vacuum furnace. This furnace, designated the U L V A C Model FHWU-150, is a large capacity, high-temperature furnace for use in ultra-high vacuum (or inert gas atmosphere) at temperatures up to 2600°C. It is complete with furnace assembly, ultra-high-vacuum pumping system, gauges, power supply, controls and safety devices. The pumping system, contained in the cabinet, is said to have excellent characteristics both in ultimate pressure and in pumping speed. The ultimate pressure in the furnace chamber when empty, clean and degassed is said to be at least 3 × 10 -9 torr. The effective pumping speed at the furnace chamber is approximately 1300 litres/sec over a pressure range of 5 × 10 -4 to 5 x 10 -9 torr. The pump-down time to 10 -9 torr is about 90 minutes after degassing. A pressure o f 10 -7 torr or lower can be expected during operation at 2600°C. The unit is said to be suitable for sintering a large volume of reactive metals because of its high-temperature capability, large heat zone and ease of operation. Heating elements are available in either tungsten or tantalum and heat shields are made from tungsten, tantalum and titanium. Ultra-high-vacuum coater. This unit, designated the EBV-10, was developed by the Company for research into and development and production of means of thin-film deposition in ultra-high-vacuum. Its outstanding feature is claimed to be its quick pump-down to 10-8 torr in 10 minutes. Other features include: Rapid operation cycle: by using specially designed ultra-highvacuum valves in the main pumping line a rapid operation cycle is expected in production; Low backstreaming of pumping fluid: a specially designed cold-trap system completely protects against oil backstreaming that affects the quality of the thin film; Versatile feed-through collar: this includes 15 service parts and the many options available on accessories are claimed to greatly increase the versatility of the unit; Easy operation: valve operation is easily achieved by a simple lever; Safety device: this is attached to prevent backstreaming of the rotary oil pump should an electrical failure occur; Less maintenance: all components and parts are carefully checked before assembly; Viton gaskets: these are used in the high-vacuum system to make for ease of assembly.
Figure 1. PUL-IO oil diffusion pump Oil diffusion pumps. These pumps, designated the model P U L series, have been developed for ultra-high-vacuum work and are said to be already in wide use for thin-film deposition work and in
Efco Furnaces Limited, UK Circle number 62 on Reader Enquiry Service card
Vacuum precision-casting plant A new type of vacuum precision-casting plant, VSG 50 P, is being developed and introduced by Balzers A G of Leichtenstein. The design is such that the main horizontal chamber remains constantly under vacuum whilst the furnace is in operation and complete continuity is provided by two lock chambers.
Vacuum precision-casting plant VSG 50 P A retractable immersion thermocouple allows the temperature of the melt to be measured as often as required and the thermo-element can also be changed without interruption of the vacuum. A second, larger lock (shown open in the Figure) has a diameter of 500 mm, which allows moulds pre-heated to 1000 ° to 1200°C to be fed into the main chamber so that casting can take place. The complete loading and casting cycle, including mounting the mould on the swivel mould platform, closing of the lock cover, evacuation of the lock, opening of the lock valve, swinging in of the mould, teeming, swinging back of the mould and casting, closing of the lock valve and admitting air to the lock can be completed in less than 3 minutes. Thus floor-to-floor times for casting of 8 to 10 minutes are easily achieved. The main chamber can be evacuated to 10-5 torr in less than 6 minutes and the pumping down of the lock chamber takes 45 seconds. An MF-Unit with a rated capacity of 100 kW normally provides the power for melting, the current being fed to the coil via a rotary contact, so that the use of cables is entirely avoided. A pre-fabricated crucible that can be changed in about 10 minutes is normally utilized for melting. A water-cooled condensation surface in the main chamber above the melting crucible, ensures that the inner walls of the chamber remain practically free from metal condensate. The condenser is readily changeable and can be quickly cleaned inside or outside the plant, whichever is found to be the more convenient. The plant can also be provided with a mould turntable and by a simple adaption can be used for ingot casting, where, for example, the customer is interested in recovering scrap material for remelting into bar stock. For such work a crucible having a maximum capacity of 50 kg of steel can be used. The operating sequences are to a large degree automatic and fully interlocked so that errors in operation are practically impossible. The over-all height of the unit is 2650 mm and the total space requirement including the power supply unit is 2.5 × 2.5 m. Balzers A G, Leichtenstein Circle number 63 on Reader Enquiry Service card
554
Vacuum apparatus from Japan The Japan Vacuum Engineering Company have recently introduced a new high-temperature vacuum furnace, a new high-vacuum coater, a range of oil diffusion pumps and several ultra-high-vacuum system accessories. High-temperature vacuum furnace. This furnace, designated the U L V A C Model FHWU-150, is a large capacity, high-temperature furnace for use in ultra-high vacuum (or inert gas atmosphere) at temperatures up to 2600°C. It is complete with furnace assembly, ultra-high-vacuum pumping system, gauges, power supply, controls and safety devices. The pumping system, contained in the cabinet, is said to have excellent characteristics both in ultimate pressure and in pumping speed. The ultimate pressure in the furnace chamber when empty, clean and degassed is said to be at least 3 × 10 -9 torr. The effective pumping speed at the furnace chamber is approximately 1300 litres/sec over a pressure range of 5 × 10 -4 to 5 x 10 -9 torr. The pump-down time to 10 -9 torr is about 90 minutes after degassing. A pressure o f 10 -7 torr or lower can be expected during operation at 2600°C. The unit is said to be suitable for sintering a large volume of reactive metals because of its high-temperature capability, large heat zone and ease of operation. Heating elements are available in either tungsten or tantalum and heat shields are made from tungsten, tantalum and titanium. Ultra-high-vacuum coater. This unit, designated the EBV-10, was developed by the Company for research into and development and production of means of thin-film deposition in ultra-high-vacuum. Its outstanding feature is claimed to be its quick pump-down to 10-8 torr in 10 minutes. Other features include: Rapid operation cycle: by using specially designed ultra-highvacuum valves in the main pumping line a rapid operation cycle is expected in production; Low backstreaming of pumping fluid: a specially designed cold-trap system completely protects against oil backstreaming that affects the quality of the thin film; Versatile feed-through collar: this includes 15 service parts and the many options available on accessories are claimed to greatly increase the versatility of the unit; Easy operation: valve operation is easily achieved by a simple lever; Safety device: this is attached to prevent backstreaming of the rotary oil pump should an electrical failure occur; Less maintenance: all components and parts are carefully checked before assembly; Viton gaskets: these are used in the high-vacuum system to make for ease of assembly.
Figure 1. PUL-IO oil diffusion pump Oil diffusion pumps. These pumps, designated the model P U L series, have been developed for ultra-high-vacuum work and are said to be already in wide use for thin-film deposition work and in