los materiales

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the materials

Ana luna GarcíaMaría Pérez morales Manuela del Carmen Sanchez Gisi

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The materialsyou can find tecnology objects around you, this objects are maked with diferents materials Now we are going to learn the diferents properties of the materials : To make an object we need to do three steps: 1- Raw materials: are the subtances that we found in the nature for example:cotton,rocks and minerals we classify the raw materials into theree groups: -animal raw material: wool -vegetable raw material:cotton -mineral raw material: sand

2- The materials: are obtained from through industrial processes and are used to manufacture products 3-The products: is any object created and designed by man from meterials to meet his need or improve his live so,the products made from diferents materials and the materials are obtained through raw materials

ESTRUCTURA TU CONTENIDO

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clasification of the materials of a technical

the most used materials to make technological products are :

• ceramic materials

• stone materials

• textile materials

• wood

• metals

• plastic

• ceramic materials

• stone materials

• textile materials

properties of materials

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The properties of a materials are the set of characteries that meke it behave in a certain way before external phenomena such as light,heat,forces and electricity... Propiedades fisicas: -densidad :relacion entre la masa del material y su volumen -conductividad electrica:permite el paso o no de la corriente ;aislantes electricos y conductores electricos -conductividad acustica: capadidad de conducir el sonido; aislantes del sonido y conductores del sonido PROPIEDADES TERMICAS: -conductividad termica : capacidad para transmitir el calor;conductores termicos y aislantes termicos -Dilatación: capacidad de aumentar o disminuir su volumen -Fusibilidad :capacidad de pasar de estado solido a liquido elevando la temperatura

Propiedades MECANICAS

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THE WOOD

wood is a raw material of plant origin that is obtained from the woody parts of tree trunks: It is made up mainly of two elements: -Cellulose -Lignin we can see the following parts in it - the bark - The Cambium -The sapwood - The heartwood - The medulla

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wood is a raw material of plant origin that is obtained from the woody parts of tree trunks: It is made up mainly of two elements: -Cellulose -Lignin we can see the following parts in it - the bark - The Cambium -The sapwood - The heartwood -

wood properties and material obtaining process

The density of wood is better than that of water. Dry wood is a good electrical insulator It is a good thermal insulator, although it burns very easily. This property of wood is called hydroscopicity.

wood clasification

hardwoods

softwoods

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Commercial forms of wood The commercial forms of wood that we can find in the market are : Strips and moldings of square, rectangular, circular,... Solid boards Boards and planks, rectangular section. Profiles, which are obtained from the strips, which are given a certain shape. shape. Veneer, consisting of very thin sheets used to cover chipboard or plywood. chipboard or plywood or other wood of lesser quality.

- Genially

DERIVATIVES OF WOOD

Wood derivatives are those materials that are not obtained directly from the trunks, but from wood fibers or chips. from logs, but from wood fibers or wood chips. These derivatives include prefabricated wood and cellulosic materials. cellulosic materials. PREFABRICATED WOODS : are easy to work, are not attacked by parasites and are available in a wide range of materials. and are available in a wide range of sizes and finishes. They stand out : plywood, chipboard and fiberboard. They are used for the construction of furniture, wall coverings, doors, partition walls, pre-faced constructions,...

CELLULOSE MATERIALS : Those that have been made with the cellulose of wood. of wood. Paper is the most important. Others are cardboard, cardboard, tissue paper,... tissue paper,...

unions by assemblies

To build any type of wooden objects it is necessary to perform a large number of tasks. number of tasks. However, all of them can be grouped into the following stages of construction: 1. stages of construction: a) Making the pieces that form the object. the object. b) Assembly and joining of the different different pieces. c) Finishing.

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union by assemblies

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ferrous and not ferrous metals

Most metals are found in nature as minerals. Their and complicated to obtain, but of great interest, due to their important technical qualities. technical qualities. The process of extraction and transformation of metals is called metallurgy. metallurgy. There is a great variety of metallic materials. Some are used in an almost pure state, such as silver pure, such as silver, gold or platinum. Most of them, however, are combined with each other or with other elements to form alloys. with each other or with other elements to form alloys that extend and improve their properties. properties.

FERROUS METALS Ferrous metals are obtained from minerals such as: MAGNETITE or SIDERITE. Ferrous metals are: - Pure iron - Steel (Fe + (0,05 -1,6)% of C) - Cast iron (Fe+ (1.6 -6)% of C)

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