Name of Work: Supply and Installation of Vacuum Hot Press at USBAS
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Item Description
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ITEM DESCRIPTION
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ProductVacuum Hot press is utilized to compact homogenous powders into a high-density pellet for analysis. To ensure ease of use, the process should be automatic and fully programmable rendering it ideal for repetitive compaction analytical techniques.ApplicationPreparation of high-density pellets for thermoelectric device applications.Mounting TypeFloor mountingWorking principlePressure force and temperatureOutputCompacted pelletsMaximum operating temperature1200°C (with temperature range 100K to 1200°C ±5°C)Temperature measuring arrangementThermocouple K or S (NABL calibrated)Load15 tons., with calibration certificates of GaugesFeed materialsPolymer, metals, semimetals, semiconductors and ceramicsPellet size20 mm diameter and 6 mm thickness or moreAtmosphereInert with argon gas purgingVacuum10-3 Torr or BetterType of load applyHydraulic power pack with motor operating pressure in the range of 15 tons or betterMaximum fill height in die15 mm or moreHot zone volume150 mm dia. x 150 mm height or moreShell ConstructionThe fabrication should be of high-quality stainless-steel body structure using double wall construction, reinforced with proper stiffeners, and finished.InsulationWater cooling (Water circulation should be provided in all sides)Skin TemperatureA double wall structure should be implemented, along with specialized chilled water circulation system, to maintain the skin temperature just above or suitable ambient levelsVacuum chamber material Suitable INCONEL (High density Isostatic pressuring graphite; density greater than 1.88 g/cc)Fittings for controlled atmosphere for noble gases along with suitable adapter/displayA stainless steel (SS3l6) door should be equipped with water cooling arrangement and Whiton \"o\" ring and connected to vacuum and suitable to purging multiple gases N2, Ar, Air, etc.Multiple ports in the fittingsThe SS door fittings should include multiples ports at the both the end: Connection to evacuation, gas inlet, gas outlet and pressure gauge, all should be equipped with necessary valves and control. All fitting should be quality make with metal-to-metal interlocking.Heating elementsAPM Kanthal / Graphite etc.Top RamMoving DownLoading typeVertical downDay light (distance between punch and die)150 mmPressure GaugeQuality make Pressure Gauge digital/analog with calibration certificatePressure accuracy± 1% or better accuracyPressure holding time1-120min/or morePressure modeAutomatic programable Die materials• High grade Graphite die for higher temperature (up to 1200 °C)• Stainless steel/Tungsten carbide for low temperature (below 500 °C)Water chillerA suitable water chiller with circulation capacity of 50 liters per minutes or greater should be provide.Moisture controlled cooling to prevent the insulation.Protection and Safety Over temperature and over current protection feature should be provided
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