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ZveřejnilAleš Petr Černý
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Název SŠ: SŠ-COPt Uherský Brod Autor: Ing. Hana Kubišová, Ph.D. Název prezentace (DUMu): Non-Metalic Materials Název sady: Technical English for students of study branch Technician Gunsmith 2 nd, 3 rd and 4 th class Číslo projektu: CZ.1.07./1.5.00/34.0727 Datum vzniku: 21.1.2013 Uvedení autoři, není-li uvedeno jinak, jsou autory tohoto výukového materiálu a všech jeho částí. Tento projekt je spolufinancován ESF a státním rozpočtem ČR. 1
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Záměrem této sady výukových materiálů s názvem Technical English je ukázat žákům, kteří se v této oblasti vzdělávají, jaký byl vývoj zbraní. Jednotlivé DUMy (prezentace) v této sadě popíší postupně tematické oblasti, které jsou probírány v předmětu Anglický jazyk na naší SŠ. Konkrétně tato prezentace je zaměřena na nekovové materiály. ANOTACE 2
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REVISION 3
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How do we divide iron ? How do we classify steels ? What do you know about steel class 10? What do you know about steel class 18? How many grades of steel do you know? What is the numeric steel grade ? What does the additional digits express? 4
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What kind of cast iron have we got? What is the first number of iron? Which other materials are used in production of weapon? 5
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NON-METALLIC MATERIALS 6
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Metallic materials are substituted for plastic. Polymeric materials have got better properties than metallic materials. Metallic materials have got a higher density and lower resistance to corrosion and other chemical effects. Polymeric materials, wood, ceramics, stoneware, porcelain, leather, textiles, glass and paper present the groups of the most important non-metallic materials. 7
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Polymeric materials are the youngest group of construction materials. The production of polymeric materials started around 1920. Polymeric materials are new construction materials with specific properties. Polymeric materials are brittle, rust, isolated and easily machined. 8
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Polymeric materials are organic macromolecular compounds. Polymeric materials are produced synthetically. The basic raw materials are mainly oil and coal and other substances. Properties of polymeric materials can be modified by additives. 9
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Admixture of polymeric materials are : fillers, softeners, pigments, stabilizers, lubricants, blowing 10
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THERMOPLASTICS 11
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Thermoplastics are divided into: PVC is widely used at temperatures of 60ºC, resistant to acids and alkalis, PE is resistant to acids, alkalis and solvents at temperatures of 75ºC, it is lighter than water, PP is used in temperatures up to 90ºC, PS is hard, brittle, transparent, well dye, at temperatures of 75ºC. Excellent insulator, well dissolves and stick, easy to process. 12
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Styrene-impact polystyrene, is resistant to impact, as vulcanizable is used to production tires, shoe soles, gaskets etc.. ABS is a tough, highly resilient to temperature 85ºC. Cellulose-acetate is a solid, tough, transparent, dye, slightly moistened. 13
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PTFE (Teflon) is a less strong and a very tough polymer. PTFE is resistant from -250ºC to +250ºC. It is completely resistant to all chemicals; PTFE has got high lubricity and is an excellent insulator. PA is resistant to wear, absorbs shock and vibration applications at temperatures 80ºC. Is violated acids. 14
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POM is hard, very tough, at temperatures 90 ºC. It distorts acid. PC is tough, extremely tough, unbreakable transparent material, resistant to 120ºC. PMMA is an organic glass. PMMA is shatterproof, resistant to weather conditions, temperatures at 75ºC. 15
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THERMOSET AND ELASTOMERS 17
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Fenolformaldehyd is hard, brittle, resistant to solvents and temperatures up to 120ºC. Epoxy-solid is resistant to weather and temperature at 120ºC. Polyesters are binder for glass fibers, up to temperature 120ºC. Polyurethane is rigid to rubbery material with a high abrasion resistance and a damping capacity. 18
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Silicones are organic compounds of silicon and oxygen, resistant to aging, weathering, water- repellent and resistant to temperatures up to 200ºC. Silicone rubber is elastic from -60ºC to +220ºC. . 19
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OTHER MATERIALS 20
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Other technical non-metallic materials: wood, glass, technical porcelains, technical ceramics, leathers, textites, papers. 21
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Treatment of metals : annealing, hardening, tempering, special thermal treatment processes, heat treatment. 22
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QUIZ 23
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Why do we use plastics? When did the production of polymeric material start? How can you produce plastics? What is it added to plastics? What do you know about termoplastics? 24
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What do you know termosets and elastomers ? What do you know other technical non-metallic materials ? How further processed metals? Which way is the best treatment? 25
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SUMMARY 26
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Polymeric materials are used for production of guns. Ceramics, glass or wood are also used. Polymeric materials have got very unique properties. Extrusion, injetion are used as technology of production of parts guns. Termoplasts are PP, PE, PTFE. Rubber is a termosets. 27
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REFERENCE-TEXT 28
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29 KŘÍBEK, J. Střelné zbraně I. část, 2. vyd. Brno: PC-DIR spol. s.r.o., 1995. ELMAN, J. a Michalíček, V. Česko-Anglický technický slovník, 1. vyd. Praha: Sobotáles, 2002.
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REFERENCE-OBRÁZKY 30
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Snímek č. 12 [cit. 2013-22-08] Dostupný pod licencí Public Domain na http://commons.wikimedia.org/wiki/File:Syndiotactic_polyprope ne.png http://commons.wikimedia.org/wiki/File:Syndiotactic_polyprope ne.png 31
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