Wyniki wyszukiwania - Biblioteka Nauki

1

Mikrowtryskiwanie tworzyw polimerowych - technologia, narzędzia i maszyny

100%

Brzostek A. , Kaczmar J. W.

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tom T. 52, nr 3

179-183

PL

Scharakteryzowano dwie podstawowe metody wytwarzania mikrourządzeń - wygniatanie na gorąco i mikrowtryskiwanie, uwypuklając przy tym ten drugi sposób. Omówiono etapy procesu technologicznego oraz przebieg mikrowtryskiwania tworzyw polimerowych. Przedstawiono budowę narzędzi formujących oraz stawiane im wymagania procesowe. Opisano techniki wytwarzania wkładek formujących, takie jak obróbka mikromechaniczna, drążenie elektroerozyjne, a w szczególności proces LIGA. Wskazano na różnice istniejące pomiędzy mikrowtryskiwaniem a konwencjonalnym formowaniem wtryskowym.

EN

Two basic methods of micro-devices’ manufacturing: hot embossing and micro injection molding were characterized, the latter method was stressed. The stages of technological process and the course of micro injection molding of polymers were described. The constructions of forming tools and the processing requirements were presented. The techniques of fabrication of mold inserts, such as micromachining, electro-erosion machining and especially LIGA process (Fig. 2), were described. The differences between micro injection molding and conventional injection molding were pointed.

2

Właściwości i zastosowanie kompozytów polimerowych z włóknami naturalnymi

100%

Pach J. , Kaczmar J. W.

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2010

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tom Nr 12

277-282

PL

W pracy zaprezentowano zalety i ograniczenia stosowania kompozytów polimerowych z włóknami roślinnymi jak również współczesne zastosowania tych materiałów. W części doświadczalnej przedstawiono wpływ promotora adhezji oraz modyfikacji włókien konopnych metodą alkalizacji na podstawowe właściwości mechaniczne kompozytów na osnowie polipropylenu z włóknami konopnymi.

EN

Advantages of polymer composites with natural fibres are presented in this paper. Pres. there are found the numerous applications of composites strengthened with natural fibres, influence of compatilbilizator content and modification of hemp fibres on mechanical prop are analyzed in experimental part of this paper.

3

Risk management and insurance of open-cut mining and transportation systems in the brown coal mines

100%

Kaczmar J. W. , Dudek D.

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tom Vol. 8, No. sp.

5-14

EN

Problems of risk management and insurance of machines working in the brown coal mines are discussed in the paper. Risk management processes normally contain four steps i.e. risks identification, estimation and analysis of risks, controlling of risks and financing of risks. Risks which are impossible to avoid must be transferred to the insurance company and insured. Classification of the accidents in the brown coal mines are presented and examples of the chosen accidents shortly discussed. Insurance systems of machines working in the brown coal mines were shown and discussed.

4

Enhancement of Heat Transfer in PCM by Cellular Zn-Al Structure

80%

Naplocha K. , Koniuszewska A. , Lichota J. , Kaczmar J. W.

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5

Compressive Strength of EN AC-44200 Based Composite Materials Strengthened with α-Al2O3 Particles

80%

Kurzawa A. , Kaczmar J. W.

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nr 2

6

Bending Strength of EN AC-44200 – Al2O3 Composites at Elevated Temperatures

80%

Kurzawa A. , Kaczmar J. W.

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7

Manufacturing and microstructure of MMC based on CuZn38Al2Mn1Fe brass strengthened with δ-alumina fibres

71%

Kaczmar J. W. , Granat K. , Pietrzak K. , Naplocha K. , Grodzka E.

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tom Vol. 10, iss. 1 spec.

411--414

EN

Metal matrix composite materials were manufactured by squeeze casting with CuZn38Al2Mn1Fe brass of porous preforms made of δ-alumina SAFFIL fibres. The microstructure, Brinell hardness and Vickers microhardness of manufactured composite materials were characterized. Preforms with 10 and 20 vol. % of fibres were preheated and infiltrated applying the pressure of 80 MPa. Microscopic observations showed that alumina fibres are uniformly distributed in the MA58 matrix and there was not observed the destroying of ceramic fibres during squeeze casting process. Hardness of composite materials strengthened with 20 vol.% of SAFFIL fibres reached 265 HB. At the boundary of composite material/not strengthened MA58 alloy it was ascertained the filtration and retention of iron compound precipitates caused by the small dimensions of pores in the ceramic preform. The collection of iron phase precipitates at the boundary composite material/ not strengthened MA58 alloy effected in the increase of microhardness in this zone to 352 HV. On the base of SEM observations the conclusion on limited wettability of fibres by liquid MA58 brass was drawn.