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Materials 1 - Contenido educativo
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Well, after writing, planning, it's a good idea to retake or review the different contents about materials and tools and I think we are going to do now.
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It's important to know what is materials in technology. After that, we are going to explain the classification of materials and the properties of them.
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and we'll do a small description about some of the most important materials
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and after that I'm going to summarize
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The main thing that usually we do in the workshop, when we are building our projects, are the
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tools that usually we use and more or less workshop.
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Firstly, obviously everything is made by materials. Things have a shape, a three-dimensional shape and to do these shapes we need different parts.
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and each part is made with a typical material
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nowadays for example plastics are very used in different things
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for so many things
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that is that materials indeed aren´t just only one substance
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usually are a mixture of different substances
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A substance is mainly formed by just only one type of molecule
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and as you know the molecules are formed, are being, are being by the joint of different atoms
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so the complexity the material are very complex but this complexity is made by
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misters of simple things the particles such as electron or proton of neutron
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can be part of an atom
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and the joint of different atoms with the different chemical link
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make the substance
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and the mixture of different substance, in general, can form part of different materials,
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different technical materials. So, indeed, materials are very complex. In order to easy
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our study we will classify materials into two main categories which are
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methods and non-methods. There are more than one classification. This is one of
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the most important, but other possibility would be into structural and functional materials
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and it is also a technical classification.
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Well, return to the main idea, materials can be classified into two different groups, which
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are metals and non-metals.
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Obviously, it is very easy to distinguish a metal and it is the main reason why we use
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this kind of classification.
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Another good reason is because the methyl link has a very specific and typical properties
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as we will describe later.
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Then methods can also be divided into ferrows and noferrows.
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Well, indeed, there aren't any methods with 100% of the technical materials usually are
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the solutions of a metal with other metals or no metals and it is very important to know.
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When I say that a material is a metal, I'm saying really indeed that it is a dissolution
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which metal is solvent. So we can distinguish ferrous and noferrous.
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In ferrous the solvent is iron but the other substance usually is carbon and if the
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the quantity of carbon is less than 2% then this is a steel, otherwise it is a steel.
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To know Ferreira's materials, we can classify into two categories, which are light if its
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density is less than titanium, or heavy if its density is higher than titanium.
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category one example of life category would be a titanium and also aluminium
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one example one example of heavy could be a copper and its alloys such as
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bronze and brass. For non-metals materials there isn't any any good classification.
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People usually classify using their main uses, for example materials for buildings or material
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for clothes or materials for other things. I classify non-metals into two good categories
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which are natural and synthetic. Obviously natural aren't not so natural
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Because, for example, marble or granite or clay usually are understood as natural materials.
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But obviously, when I use one of these materials, it's not a raw material, it's a processed
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material.
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So it's the point, the characteristic of technology.
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And synthetic materials are made in a laboratory, so they aren't in the nature.
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You can find them in the nature.
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For natural materials we can classify them into two different categories which are organic
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and inorganic and for synthetic materials also we classify into organic and inorganic.
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The importance of the materials are because their properties and because they are used
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in technological work and the uses are connected with their properties.
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So we can classify the properties into three main categories, which are mechanical, physical
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and chemical.
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One example of mechanical property could be a breaking strength or elasticity.
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For physical properties, it could be a good example, density and conductivity.
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And finally, for chemical properties, a good example, obviously, is the composition of
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these materials.
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Obviously it is very important to do a good selection of material, because each material has its own property,
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so you can focus on just one specific application of this material.
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For example, there are a lot of materials such as metals that are usually used in structural applications.
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Whereas you also have other materials such as copper that is very important for electricity applications.
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So, nowadays we can combine different materials to do composite materials and this is one advantage and one advantage of material science.
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But indeed there isn't the best material, there isn't the perfect material for all uses.
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so you can analyze in each case which is the best materials in each case and this
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is a very important and very difficult activity for science well connected what
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I have said before in in this slide you can compare three types of materials
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that are very useful and I don't know they say they are the most useful ones
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and you can analyze the good properties and the bad properties in order to can
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choose which is the best of all for one specific application of this material
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And this is the end of the first introduction to material science.
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What you need to do now is the exercise that I proposed to you because it is the only way
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that you can understand all of this complex content.
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I'll see you. This is the end, so I hope you can enjoy it and you can learn.
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Today, that is all. Now we are going to do the activities.
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- Autor/es:
- Isabel Lafuente
- Subido por:
- Isabel L.
- Licencia:
- Reconocimiento - No comercial
- Visualizaciones:
- 109
- Fecha:
- 25 de abril de 2019 - 18:44
- Visibilidad:
- Público
- Centro:
- IES JAIME FERRAN
- Duración:
- 15′ 33″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1920x1080 píxeles
- Tamaño:
- 134.61 MBytes
