STONE: marble, granite, slate.
STONE BINDERS: plaster, cement, mortar, concrete.
CERAMICS: Baked clay, earthenware, heat resistant material, stoneware, porcelain.
- Shaping techniques: mould blowing, float glass making and lamination
jueves, 22 de enero de 2015
miércoles, 17 de diciembre de 2014
There are two main types of plastics and these are named Thermoplastics and Thermosetting Plastics.
Thermoplastics are made up of lines of molecules with few cross linkages. This allows them to soften when heated and to be bent into a variety of shapes and forms. They become stiff and solid again when cold. This process can be repeated many times. The bond between the molecules is weak and become weaker when reheated, allowing reshaping. Thermoplastics tend to be composed of 'long chain monomers. They can be recycled.
Thermosetting Plastics are made up of lines of molecules which are heavily cross linked. It creates a rigid molecular structure. They may be heated the first time and shaped but they become permanently stiff and solid. They cannot be reshaped again. The molecules of these plastics are cross linked in three dimensions and this is why they cannot be reshaped or recycled
DEFINITION OF PLASTIC
Plastics are man-made materials. Plastics have taken the place of traditional materials like woods and metals.
Plastics differ from other materials largely because of the size of their molecules. Most materials have molecules made up of less than 300 atoms, plastics contain thousands of atoms. We call them Macromolecules.
Some plastics are derived from natural substances such as animals, insects and plants but most are man-made. These are named Synthetic Plastics. The first plastic based on a synthetic polymer was made from phenol and formaldehyde, with the first viable and cheap synthesis methods invented by Leo Hendrik Baekeland in 1909, the product being known as Bakelite.
Most synthetic plastics come from crude oil but coal and natural gas is also used.
Monomers are chemical substances consisting of a single molecule. Thousands of these are linked together in a process called Polymerisation to form new compounds called Polymers. They are composed of organic condensation or addition polymers and may contain other substances to improve performance or economics. The vast majority of plastics are composed of polymers of carbon and hydrogen alone or with oxygen, nitrogen, chlorine or sulfur.
lunes, 15 de diciembre de 2014
lunes, 20 de octubre de 2014
1. TRANSLATE INTO ENGLISH
2. RADIO: RADIUS
3. PLANTILLA: STENCIL
4. HIPOTENUSA: HYPOTENUSE
5. BOCETO: SKETCH
6. CROQUIS: OUTLINE
7. MEDIDAS: MEASUREMENTS
8. SCALE: ESCALA
9. AMPLIAR: ENLARGED
10. SCALIMETRO: SCALE RULER
11.PERFIL DERECHO: RIGHT SIDE
12. ALZADO: FRONT VIEW
13.PLANTA: TOP VIEW
14. PELIGROSO: DANGEROUS
18. TRANSPORTADOR DE ÁNGULOS: PROTRACTOR
19. DIBUJO TECNICO: TECHNICAL DRAWING
20. CINTURÓN DE SEGURIDAD: SAFETY BELT
viernes, 19 de septiembre de 2014
Practical use of knowledge, extend abilities, satisfy needs /wants & solve problems.
The process of creating things by planning.
The process of improving and changing a technology that already exists.
The process of designing new products.
In the design process, things that the product must do or include.
Group members suggest ideas out loud as they think of them.
A working model.
Uses knowledge of science, math & technology to solve technical design problems.
What Technology Does:
Transforms resources into products and services and solves problems.
UNITS OF MEASURE CHART
miércoles, 23 de abril de 2014
1. TRANSLATE INTO ENGLISH
Arrabio: Cast Iron
Alto horno: Blast Furnace