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- Bengtsson, B., et al.
(författare)
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Quantitative STEM microanalysis
- 1978
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Ingår i: Scandinavian journal of metallurgy. - 0371-0459 .- 1600-0692. ; 7:2, s. 57-59
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Tidskriftsartikel (refereegranskat)
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| 2. |
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| 3. |
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| 4. |
- Forssberg, Eric, et al.
(författare)
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Aufbereitung von hochphosphorhaltigen Hämatiterzen in Nordschweden
- 1977
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Ingår i: Erzmetall. - 0044-2658. ; 30:11, s. 505-510
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Until now, the iron ores mined in Sweden were mostly of the magnetite type and, therefore, easy to concentrate. But in addition to these ores, there exist considerable reserves of hematite iron ores. Deposits located north of the city of Kiruna contain certain apatite-rich hematite ores which are extremely fine-grained. The authors explain how the selectivity problems that are due to this fine-grained structure of the ores and that arise during the flotation are handled.
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| 5. |
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| 6. |
- Forssberg, Eric
(författare)
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Mechanical and thermal properties of boehmite bonded alumina bodies
- 1976
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Ingår i: Ceramurgia International. - : Elsevier BV. - 0390-5519. ; 2:3, s. 135-140
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Tidskriftsartikel (refereegranskat)abstract
- The paper describes the fabrication and the properties of boehmite bonded alumina shapes. The term boehmite bonding refers to the utilization of steam cured reactive alumina as an intermediate binder in alumina shapes. Bodies were prepared by mixing tabular alumina. After drying the shapes were treated in an autoclave at around 200°C and saturated steam pressure. During steam treatment the reactive alumina is converted to boehmite, γ-Al2O3 · H2O. Cold crushing strength figures up to 1200 kp/cm2 have been obtained. Relations between mechanical properties and porosity have been examined. The paper gives details on reaction kinetics of the formation of boehmite as well as the dehydration of boehmite at around 500°C. Boehmite dehydrates to γ-alumina at 500-520°C. Due to the high reactivity of the so formed γ-alumina, ceramic bonds are formed at low temperatures. Therefore the conversion from boehmite to γ-alumina is followed by only a slight decrease of the strength. The dehydration process has been followed by means of surface area and pore size distribution measurements and X-ray diffraction and DTA-TGA investigations. The boehmite bodies have been subjected to normal refractory testing procedure i/e hot modulus of rupture, Youngs modulus, creep, refractoriness under load, resistance to slag attack and spalling. The testing shows that the boehmite bonded ceramics have refractory properties comparable with those of normal fired chemically bonded bricks. The boehmite bonding method have also been tested on aluminosilicate, i/e cyanite, with good results. Possible applications of the method are discussed in the paper.
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| 7. |
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| 8. |
- Forssberg, Eric, et al.
(författare)
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Utilization of the Reichert cone concentrator in ore processing
- 1979
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Ingår i: Industrie Minérale. Minéralurgie. - 0367-8962. ; :4, s. 223-232
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Tidskriftsartikel (refereegranskat)abstract
- This article describes the Reichert cone concentrator EM DASH a gravity separation device which operates on the principle of fluid bed separation on an inclined plane EM DASH and then discusses the present uses and potential applications of Reichert cones in ore beneficiation. Examples are given of the concentration of Liberian iron ore and the separation of fine coal on Reichert cones.
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| 11. |
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| 12. |
- Jacobson, Be
(författare)
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An experimental determination of the solidification velocity for mineral oils
- 1974
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Ingår i: ASLE Transactions. - : Informa UK Limited. - 0569-8197. ; 17:4, s. 290-294
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Tidskriftsartikel (refereegranskat)abstract
- The behavior of mineral oils under high hydrostatic pressures is studied. It is found that a test oil converts from a liquid to a solid faster than within 9 μs when the time mean value of the pressure is 1,200 N/mm2(— 12,000 atmospheres). As the solidification velocity for liquids increases approximately proportional to the pressure rise above the static solidification pressure, this solidification time shows that rolling element bearings under normal working conditions have solidified oil in the high pressure part of the contact.
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| 13. |
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| 14. |
- Sotkovszki, P., et al.
(författare)
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Secondary ion analysis of segregation in welded steels
- 1979
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Ingår i: Metal Science. - : Maney Publishing. - 0306-3453. ; 13:10, s. 597-601
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Tidskriftsartikel (refereegranskat)abstract
- The role of weld defects, such as root cracks, or cold cracking in helping to initiate fatigue failure or reducing the impact toughness of welded constructions is now fairly well established. In the case of cold cracking, it is now standard procedure to use the basic (low-hydrogen) electrodes when welding high-strength micro alloyed fine grained or quenched and tempered steels. However, it has to be acknowledged that the mechanism of cold cracking and its relation to the dispersion of inclusions or the amount of hydrogen in steels is not well understood. It has been established that cold cracking may arise in welds containing martensite due evidently to the fact that hydrogen has a lower solubility in martensite than ferrite. However, whether the expelled hydrogen then congregates at the martensite/ferrite phase boundary or elsewhere has not been clarified. It was thus the object of the present work to consider some of the metallurgical consequences of using basic or rutile electrodes when welding high-strength steels, with particular reference to the segregation of the various alloying elements around inclusions. For this purpose the relatively new technique of secondary ion analysis was employed in conjunction with light and electron microscopy. The unique feature of secondary ion analysis is that hydrogen can be detected even when present in relatively small amounts.
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| 15. |
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