Exercise 1. Вивчити новий лексичний матеріал.

1.Technical ceramics can also be classified into three distinct material categories:

Oxides: alumina, beryllia, ceria, zirconia

Nonoxides: carbide, boride, nitride, silicide

Composite materials: particulate reinforced, fiber reinforced, combinations of oxides and nonoxides.

2.The blade of a ceramic knife will stay sharp for much longer than that of a steel knife, although it is more brittle and can be snapped by dropping it on a hard surface.

3.Vehicle ceramic brake discs are resistant to abrasion at high temperatures.

4.Ceramics such as alumina and boron carbide have been used in ballistic armored vests to repel large-calibre rifle fire.

5.The two major drawbacks to using ceramics are a significantly higher cost and susceptibility to damage under shock loads

6.Ceramic materials are brittle, hard, strong in compression, weak in shearing and tension.

Домашнє завдання:

a. They ____________________ the house. (to clean)

They will have been cleaning the house

b. _____ you ____________________ to call? (to try)

Will you have been trying to call?

c. He ____ not ____________________the paper. (to read)

He will not have been reading the paper.

1. She ____________________ to help us. (to offer)

2. ______ it not ____________________ by then? (to snow)

3. We _____ not ____________________ to leave. (to plan)

4. ______ they ____________________for rain? (to hope)

5. I ____________________ my friends. (to visit)

6. He ______ not ____________________ the pictures. (to develop)

7. _____ we not____________________ them often? (to see)

8. They ____________________ for twenty-four hours. (to wait)

9. _____ he not ____________________ down? (to lie)

10. They _____ not ____________________ here long. (to live)

11. You ____________________ a speech. (to give)

12. It ____________________ for two days. (to snow)

13. We ____________________ our breath. (to hold)

14. She ____________________ with them. (to argue)

15. He ____________________ what happened. (to wonder)

Exercise 12. Make a short report about “Ceramic. General classification of ceramics.” in general.