1
PM simply heat cured. The sealant has minimal contraction and thus is claimed not to give a micro-concave surface during curing. This prevents the formation of paths of leakage across the face of the component when it is required to retain fluid under pressure. Sealing the porosity also seals in dust and contaminants which is vital if the component is to be used in a computer disk drive. The leaflet is available from Ultraseal International Ltd, Centurion House, Roman Way, Coleshill, Birmingham B46 1HQ, UK. Furnace Designed for Processing Powder Compounds Lenton Thermal Designs Ltd of Market Harborough, UK, has announced the development of a furnace system which is designed to provide a variety of operational features necessary for processing powder compounds. The rotary incline tube furnace (RITF) is claimed to be an innovative heat treatment system. It has a maximum operational temperature of 1600°C and a work tube of 80 mm inside diameter. The passage of the powder sample is assisted through the tube during processing by rotating the tube at up to 10 rpm and by inclination with the furnace asssembly to any angle within 0 to 10° to the horizontal. There is a variety of options such as a variable-amplitude electromechanicai vibrator, to prevent the accumulation of powder on the inside surface of the work tube. Further options are a hopper screw-feed and facilities for processing in an inert atmosphere. Mitsubishi Develops Stronger Steel Alloys Two powdered steel alloys for use in the production of highly durable sintered gear-cutting tools have been developed by Mitsubishi Heavy Industries, according to a report in The Wall Street Journal. The two materials, MAC-H and SKH-M have a strength of approximately 400 kg/cm 2, which is twice the strength of conventional alloys. They owe some of their strength to carbide particles that are about one third the diameter of those found in conventional alloys, says Mitsubishi. The company expects sales during the products' first year to reach 1.5 billion yen. US Bronze Announces New Copper Powders United States Bronze Powders Inc (USB) of Flemington, New Jersey, USA, has announced three new copper and copper alloy powders for powder metallurgy (PM). M-1000 copper is a water atomized powder, specially processed to achieve lower apparent densities than typical PM powder. It has a high green strength and moderate compressibility, says USB. PM applications include the primary use in friction product formulations, and additions to pre-mix bronze to obtain dimensional stability. Designed for addition to iron powder blends to give a lower effective sintering temperature and for premix bronze powders, M-2000 is a water atomized, irregular copper powder lightly alloyed to provide for lower melting point, high compressibility, moderate green strength and low residual oxide. The third new powder, M-3000, is a water atomized, irregular, pre-alloyed bronze powder with high green strength and lower apparent densities than typical air atomized, pre-alloyed bronze powder. Its PM applications include high density structural parts, additions to premix bronze and iron powder blends to achieve specific metallurgical characteristics of sintered components and also matrix powder for diamond tools. The rotary incline tube furnace from Lenton is designed for the processing of powders up to 1600°C. Powder Materials in Transportation Call for Papers The UK-based Institute of Metals is calling for papers for the PM'91 Powder Metallurgy Group Meeting, 'Powder Materials in Transportation' conference to be held on 21-23 October 1991 in York, UK. The conference will discuss the use of powders and powder metallurgy processes, relating to transportaion by road, rail, sea and air. Authors wishing to submit papers should send a 200-word abstract to The Conference Department (PM), The Institute of Metals, 1 Carlton House Terrace, London SW1Y 5DB, UK, by the end of this year. Copper Consumption to Rise Copper consumption worldwide will rise at 1.4% a year from 1989 to 2000, according to a report from Roskill Information Services of London, UK. 'The Economics of Copper 1990' says that the most important issue affecting the market for copper is the adoption of fibre optic cable in preference to copper for the transmission of telecommunications signals. However, increased demand for telecommunications channels in the future is likely to maintain the demand for copper wire at a higher level. Consumption of copper scrap is expected to increase faster than the consumption of refined copper from primary sources. 652 MPR October 1990

Mitsubishi develops stronger steel alloys

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simply heat cured. The sealant has minimal contraction and thus is claimed not to give a micro-concave surface during curing. This prevents the formation of paths of leakage across the face of the component when it is required to retain fluid under pressure. Sealing the porosity also seals in dust and contaminants which is vital if the component is to be used in a computer disk drive. The leaflet is available from Ultraseal International Ltd, Centurion House, Roman Way, Coleshill, Birmingham B46 1HQ, UK.

Furnace Designed for Processing Powder Compounds Lenton Thermal Designs Ltd of Market Harborough, UK, has announced the development of a furnace system which is designed to provide a variety of operational features necessary for processing powder compounds. The rotary incline tube furnace (RITF) is claimed to be an innovative heat treatment system. It has a maximum operational temperature of 1600°C and a work tube of 80 mm inside diameter. The passage of the powder sample is assisted through the tube during processing by rotating the tube at up to 10 rpm and by inclination with the furnace asssembly to any angle within 0 to 10 ° to the horizontal. There is a variety of options such as a variable-amplitude electromechanicai vibrator, to prevent the accumulation of powder on the inside surface of the work tube. Further options are a hopper screw-feed and facilities for processing in an inert atmosphere.

Mitsubishi Develops Stronger Steel Alloys Two powdered steel alloys for use in the production of highly durable sintered gear-cutting tools have been developed by Mitsubishi Heavy Industries, according to a report in The Wall Street Journal. The two materials, MAC-H and SKH-M have a strength of approximately 400 kg/cm 2, which is twice the strength of conventional alloys. They owe some of their strength to carbide particles that are about one third the diameter of those found in conventional alloys, says Mitsubishi. The company expects sales during the products' first year to reach 1.5 billion yen.

US Bronze Announces New Copper Powders United States Bronze Powders Inc (USB) of Flemington, New Jersey, USA, has announced three new copper and copper

alloy powders for powder metallurgy (PM). M-1000 copper is a water atomized powder, specially processed to achieve lower apparent densities than typical PM powder. It has a high green strength and moderate compressibility, says USB. PM applications include the primary use in friction product formulations, and additions to pre-mix bronze to obtain dimensional stability. Designed for addition to iron powder blends to give a lower effective sintering temperature and for premix bronze powders, M-2000 is a water atomized, irregular copper powder lightly alloyed to provide for lower melting point, high compressibility, moderate green strength and low residual oxide. The third new powder, M-3000, is a water atomized, irregular, pre-alloyed bronze powder with high green strength and lower apparent densities than typical air atomized, pre-alloyed bronze powder. Its PM applications include high density structural parts, additions to premix bronze and iron powder blends to achieve specific metallurgical characteristics of sintered components and also matrix powder for diamond tools.

The rotary incline tube furnace from Lenton is designed for the processing of powders up to 1600°C.

Powder Materials in Transportation

Call for Papers The UK-based Institute of Metals is calling for papers for the PM'91 Powder Metallurgy Group Meeting, 'Powder Materials in Transportation' conference to be held on 21-23 October 1991 in York, UK. The conference will discuss the use of powders and powder metallurgy processes, relating to transportaion by road, rail, sea and air. Authors wishing to submit papers should send a 200-word abstract to The Conference Department (PM), The Institute of Metals, 1 Carlton House Terrace, London SW1Y 5DB, UK, by the end of this year.

Copper Consumption to Rise Copper consumption worldwide will rise at 1.4% a year from 1989 to 2000, according to a report from Roskill Information Services of London, UK. 'The Economics of Copper 1990' says that the most important issue affecting the market for copper is the adoption of fibre optic cable in preference to copper for the transmission of telecommunications signals. However, increased demand for telecommunications channels in the future is likely to maintain the demand for copper wire at a higher level. Consumption of copper scrap is expected to increase faster than the consumption of refined copper from primary sources.

652 MPR October 1990