1 Keramik Maju

Ilmu Bahan Lanjut 01-Keramik 01-Keramik Maju Oleh Yuni Nurfiana W, M. Sc

PERKEMBANGAN KERAMIK KONVENSIONAL INDONESIA

Introduction

History of Ceramic Materials 7000 BC. 4000 BC 2600 BC 2300 BC 600 BC 800 AC 1600 AC 1900 AC 1960 AC 1986 AC

First bricks made of dried clay Frist fired bricks (Mesopotamia) Appearance of potter's wheel and firing kilns (Egypt) First bricks with sumeric cuneiform writings Ziggourat build par Our-Nammon („The tower of Babylone“) Ishtar portal in Babylone build by king Nabuchodonosor (photo) Developement of porcellaine in China Introduction of porcellaine manufacturing in Europe (Saxony) First application of non-silicate ceramics, refractories MgO and SiC Introduction of the Bayer process for the manufacturing of alumina Discovery of supraconductivity in cuprate ceramics (Müller and Bednorz, IBM Rüschlikon)

Introduction

Properties of Ceramic Materials I Ceramics

Metals

Melting point LT mechanical resistance HT mechanical resistance Thermal expansion Ductility Corrosion resistance Abrasion resistance Electrical conductivity Density Thermal conductivity Thermal shock resistance

high values low values

Introduction

Material Keramik Keramik berasal dari bahasa Yunani Keramos yang berarti peruk atau belanga yang terbuat dari tanah maka yang disebut dengan produk keramik adalah mencakup macam-macam produk yang dibuat melalui proses pembakaran. Definisi pengertian keramik terbaru mencakup semua bahan bukan logam dan anorganik yang berbentuk padat. Bahan keramik bisa crystalline di alam dan senyawa antara logam dan nonlogam seperti aluminum and oxygen (alumina-Al2O3) or silicon and nitrogen (silicon nitride-Si3N4). Type of ceramic materials based on composition: 1. Silicate ceramics: compounds containing the anionic complex (SiO4) e.g. the silicate group. 2. Advanced ceramics: Oxide ceramics: alumina, zirconia etc. Non-oxide ceramics: carbides and nitrides are the most important compounds of this group.

Berdasarkan produk

Ceramics

Jadi, apa perbedaan pokok pokok dari keramik konvensional konvensional dan keramik maju?

Introduction

Properties of Ceramic Materials II The most remarkable property of ceramic materials is their very high melting, sublimation or dissociation temperatures. Typical ceramic materials and melting points MgO Al2O3 ZrO2 (stab. Y) TiO2 elements)

2800 2030 2550 1840

°C °C °C °C

HfC HfTa4C5 WC SiC

3890 3940 2600 2250

°C °C °C °C (diss.

SiO2 Mg2SiO4 Al2SiO5 CaSiO3

1710 1810 1810 1540

°C °C °C °C

BN TiN AlN Si3N4

2400 2950 2500 1900

°C (subl.) °C °C (subl.) °C (subl.)

C Si

3750 °C 1421 °C

Introduction

Manufacturing of ceramic materials II powder processing forming, shaping drying firing finishing raw material microstructure properties

final product properties

application

Persiapan Raw Material Keramik Maju

•

Kisaran submikrometer < 1 µm (0,000039 inci)

Ukuran

• •

Homogenitas

• •

Proses

•

Teknik solid-state standar Dekomposisi garam karbonat, nitrat, sulfat untuk membentuk oksida logam atau karbida, nitrida, borida

Kopresipitasi Kalsinasi Hasilnya kristal halus oksida yang diinginkan

Kristal halus Bubuk keramik

Powder Pressing Sintering - powder touches - forms neck & gradually neck thickens • add processing aids to help form neck • little or no plastic deformation

Uniaxial compression - compacted in single direction Isostatic (hydrostatic) compression - pressure applied by fluid - powder in rubber envelope

Hot pressing - pressure + heat

 Adapted from Fig. 13.16, Callister 7e.

Raw Material properties Keramik Maju

Keramik Tradisional Raw mineral Clay

Shynthetic Powder

Silica

Presipitasi Spray dry (nano)

Freeze dry Vapour phase Sol gel