Porcelain And Bone China? What Are The Important Characteristics Of Clay?
Q1(a). What are the important characteristics of clays?
Clay is an inorganic materials mineral which contain on fine particle, normally grain size is near about <1/256mm. It shows good plasticity in wet form but become brittle when it is dried. It is good insulter of electricity and thermal conductivity. Porosity is also another important characteristic of clay.[1, 2]
(b)What is the structure of clays?
Mostly, clays have layers structure. They form combination of tetrahedral silicates and octahedral aluminates. But there is also chain structure exist like palygorskite. [2]
(c) What type of water is present in clays?
Water is present in different forms in clay. It may be exits in combined formed, or may be absorbed or hydrated. When clay is …show more content…
One of the main problems of pottery products is porosity, although it can be over with coating and using efficient method of firing. But thermal and electrical resistance and brittleness are still in clay products [4].
.
.
Q2. What is Porcelain and Bone China? What happens in the clay structure upon firing at 1200-1300 ºC?
Porcelain is ceramic material which forms after the heating of kaolin at 1200 ◦C. its surface is smooth and seductive. It has high chemical and thermal shock resistance [5]. Bone china is another type of clay which is formed after the firing of bones. Animals bones are used to fired and converted into ash. This ash is added to kaolin and Cornish Stone [6].
Generally when temperature of porcelain bodies is raised up to 1200◦ C, it became vitrified. Light can pass through from it [7].
Q3. Why porcelain able to survive thermal shock? What is mullite? Does it have good thermal shock …show more content…
These materials have good magnetic field at normal condition but after putting these materials into this critical temperature these materials show zero magnetic field, this effect is called meissner effect [1].
Q17. Ceramics have poor toughness. Why?
Ceramics have poor toughness because of it porosity. Applied stress concentrate at pores. So crack propagation is more easily and readily achieve the fracture point [1].
Q18. What is the YSZ? Explain.
Zirconia dioxide is unstable at room temperature, so we add yttrium oxide to make stabilized zirconia at room temperature. This ceramics is called yttria stabilized zirconia (ysp) [9].
Q19. YBaCuO is the first ceramic superconductor. At which temperature it becomes superconductor? Explain its structure?
Q20. What is a piezoelectric material? Are piezoelectric materials are ceramics? Describe piezoelectric and ferroelectric effect
Yes, some piezoelectric materials are also ceramics. Piezoelectric materials are such materials when some external pressure is applied to it, a potential difference is produce in it. In reverse when voltage is applied to these materials, they change their structure and expand. So these materials are used to transform electrical or mechanical signal into each other
Clay is an inorganic materials mineral which contain on fine particle, normally grain size is near about <1/256mm. It shows good plasticity in wet form but become brittle when it is dried. It is good insulter of electricity and thermal conductivity. Porosity is also another important characteristic of clay.[1, 2]
(b)What is the structure of clays?
Mostly, clays have layers structure. They form combination of tetrahedral silicates and octahedral aluminates. But there is also chain structure exist like palygorskite. [2]
(c) What type of water is present in clays?
Water is present in different forms in clay. It may be exits in combined formed, or may be absorbed or hydrated. When clay is …show more content…
One of the main problems of pottery products is porosity, although it can be over with coating and using efficient method of firing. But thermal and electrical resistance and brittleness are still in clay products [4].
.
.
Q2. What is Porcelain and Bone China? What happens in the clay structure upon firing at 1200-1300 ºC?
Porcelain is ceramic material which forms after the heating of kaolin at 1200 ◦C. its surface is smooth and seductive. It has high chemical and thermal shock resistance [5]. Bone china is another type of clay which is formed after the firing of bones. Animals bones are used to fired and converted into ash. This ash is added to kaolin and Cornish Stone [6].
Generally when temperature of porcelain bodies is raised up to 1200◦ C, it became vitrified. Light can pass through from it [7].
Q3. Why porcelain able to survive thermal shock? What is mullite? Does it have good thermal shock …show more content…
These materials have good magnetic field at normal condition but after putting these materials into this critical temperature these materials show zero magnetic field, this effect is called meissner effect [1].
Q17. Ceramics have poor toughness. Why?
Ceramics have poor toughness because of it porosity. Applied stress concentrate at pores. So crack propagation is more easily and readily achieve the fracture point [1].
Q18. What is the YSZ? Explain.
Zirconia dioxide is unstable at room temperature, so we add yttrium oxide to make stabilized zirconia at room temperature. This ceramics is called yttria stabilized zirconia (ysp) [9].
Q19. YBaCuO is the first ceramic superconductor. At which temperature it becomes superconductor? Explain its structure?
Q20. What is a piezoelectric material? Are piezoelectric materials are ceramics? Describe piezoelectric and ferroelectric effect
Yes, some piezoelectric materials are also ceramics. Piezoelectric materials are such materials when some external pressure is applied to it, a potential difference is produce in it. In reverse when voltage is applied to these materials, they change their structure and expand. So these materials are used to transform electrical or mechanical signal into each other