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1 Journal of Achievements in Materials and Manufacturing Engineering
1 Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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Pierwszy etap procesu prasowania na gorąco magnesów NdFeB wykonywanych z proszku typu MQP-D

100%

Lipiec W. , Szubzda B. , Wilczyński W. , Orłowski E.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

2003

tom Vol. 38, nr 13

263-270

W pracy przedstawiono:o parametry techniczne i działanie zaprojektowanego i wykonanego przez autorów stanowiska do wytwarzania metalicznych magnesów proszkowych metodą prasowania na gorąco,o wyniki badań przejść fazowych, mikroskopowych i chemicznych surowca (proszku NdFeB typu MQP-D z szybkochłodzonej taśmy),o parametry technologiczne procesu wytwarzania proszkowych magnesów NdFeB prasowanych na gorąco,o zależności właściwości magnetycznych próbek magnesów NdFeB prasowanych na gorąco od parametrów procesu ich wytwarzania.

First step of two steps of hot pressing technique of performing NdFeB magnets was examined. MQP-D powder was used as a raw material. Chemical, microscopic and phase transformation analysis of MPQ-D powder were made. Proper temperatures (700-900 deg C) were achieved with AC current passing through a graphite die during process. Magnetic properties were investigated with Hall Generator method.

Evaluation of selected properties of PA6-copper/graphite composite

63%

Konieczny J. , Chmielnicki B. , Tomiczek A.

Journal of Achievements in Materials and Manufacturing Engineering

2013

tom Vol. 60, nr 1

23--30

Purpose: The aim of this study was to investigate the possibility of improving the tribological properties and thermal conductivity of composites with structural modification of polyamides by the additions of copper and graphite. Design/methodology/approach: The study involved testing polyamide composites containing metallic powder. As the matrix was used polyamide 6 Tarnamid 27 Natural produced by Azoty Tarnów, which strengthened copper, graphite or molybdenum disulfide with varying participation in the composite. Taken tensile test, Brinell hardness, thermal conductivity and the tribological wear resistance. Analyzed the influence of the type of dopant and the participation of the studied property. Findings: The study showed the desirability of the use of graphite and copper as fillers polyamide. The resulting composites are characterized by satisfactory mechanical properties and thermal conductivity. Applied fillers also showed a positive effect on the value of the coefficient of friction wear him down much. Research limitations/implications: No synergistic effect of fillers on the properties of a ternary mixture polyamide-graphite-copper property in all test. Tribological wear for this material was significantly higher than for the binary mixtures of polyamide-graphite and polyamide-copper. According to the literature, composite reinforced with graphite and copper should have a best tribological properties, far in excess of other subjects. Low wear resistance of this material disqualify applications on the nodes friction. Practical implications: The results obtained newly developed composites, combined with the relatively low price of graphite and copper as compared with the price of molybdenum sulfide II may be reasons to use them as analogues of commercial mixtures of PA with MoS2. Originality/value: The results are original and valuable cognitive nature. They bring a new and expanded information about the effects of fillers on mechanical and physical properties. Unique data on tribological wear resistance depends on the type and amount of filler.