Langsung ke konten utama

STUDI SIFAT CAMPURAN 75% R-LOMBOK, 15% W-LOMBOK, 10% F-LODOYO SEBAGAI BAHAN BAKU KERAMIK STONEWARE DENGAN SUHU BAKAR 12500C

PENGARANG : Made Cingah, M Dachyar Effendi

Abstract
Research on the characteristic of mixed clay for stoneware raw material has been conducted. The mixed clay is made from 75% r-lombok, 15% w-lombok, 10% f-lodoyo. This research has showed that the mixed clay has pre-firing physical characteristic as follows: very plastic (bend ability of 360°C), brown colour, form water of 30-35%, and drying-shrinkage of 12%. Its physical characteristics after 850°C firing process are red-brick colour, low-pitch sounded, firing-shrinkage of 2.3%, total shrinkage of 14%, water absoprtion of 15.4%. And the physical characteristics after 1250°C firing process are dark-brown colour, high-pitch sounded, firing-shrinkage of 6.8%, total shrinkage of 18% and water absorption of 1.6%. According to the references and based on observation data, it can be concluded that this clay composition (coded as RL-2) satisfies conditions required for making stoneware with firing temperature of 1250°C and has dark-brown colour.

Kata kunci : tanah Lombok, stoneware, keramik

SUMBER :
Prosiding Seminar Teknologi untuk Negeri 2003, Vol. I, hal. 234 - 239 /HUMAS-BPPT/ANY

I. PENDAHULUAN

Para keramik artis biasanya menggunakan sifat keplastisan suatu bahan baku untuk menciptakan bentuk yang menarik dan indah. Bahan baku yang digunakan umumnya dalam bentuk hasil pencampuran dua atau lebih bahan mentah dengan menggunakan bahan mentah lokal dan impor untuk menghasilkan keramik jenis stoneware. Dengan adanya krisis ekonomi yang berkepanjangan harapan menggunakan bahan lokal sepenuhnya tumbuh semakin menguat. Semangat ini muncul karena bahan impor harganya sangat mahal. Hal ain yang juga penting dalam penggunaan bahan lokal adalah pencirian sifat khas produk suatu daerah tertentu.
karakteristik ideal bahan baku stoneware dapat bervariasi tergantung pada jenis barang yang dibuat, tetapi sebagian besar artisan akan memilih bahan baku yang memiliki sifat-sifat fisik prabakar (green body) yaitu; sangat plastis untuk pengerjaan dengan teknik putar, mengandung butiran kasar secukupnya yang memungkinkan untuk membuat bentuk besar, susut dalam pengeringan (susut kering) tidak lebih dari 5%, tidak ada kecenderungan meleot, retak atau pecah dalam pengeringan, tidak mengandung alkali yang akan meninbulkan busa atau bahan organik dalam jumlah besar. Sedangkan sifat pascabakar (cone 8-10) yaitu : susut dalam pembakaran (susut bakar) tidak lebih dari 6%, peresapan air antara 1-5%, warna pada pembakaran oksidasi coklat sedang dengan tekstur, warna pada pembakaran reduksi coklat oranye muda1).

KESIMPULAN

Berdasarkan telaah kepustakaan dan data hasil pengamatan akhirnya disimpulkan bahwa komposisi RL-2, yaitu R-Lombok 75%, feldspar Lodoyo 10% dan W-Lombok 15% memenuhi persyaratan untuk pembuatan keramik halus padat stoneware dengan suhu pembakaran 1250oC dengan warna coklat tua.

Komentar

Postingan populer dari blog ini

Aplikasi Bata Interlocking Untuk Rekonstruksi Pasca Letusan Gunung Merapi

ABSTRACT:    Merapi mount has broken some building in Yogyakarta in 2010. That occurance has inspirated to study and then developing some building wchich can hold up disaster by vulcanic and tectonic earthquake. Interlocking brick has some advantages for exeample are ease to engineered, less consumption of energy, and less production cost. Some composition has conducted to get proper interlocking brick material in order to fulfill ASTM standard for building brick. The composition consist of local sand, clay and cement. Interlocking brick has tested to ensure the strength of brick. Testing of interlocking brick to ensure its performance and to calculate the cost of building shown that the cost of building construction is 1.200.000 rupiah/m2, cheaper than using clay brick or other traditional brick. Based on this result, the interlocking brick can be considered to replace traditional brick especially in the land close to erupted mount andtectonic earthquake...

PEMBUATAN KOMPOSISI GLASIR BEBAS LOGAM BERAT BARIUM DAN SENG DENGAN METODE OPTIMALISASI GLASIR MENGGUNAKAN MODEL OPTIMIZATION OF GLASS BATCH COMPOSITION (OGBC)

Abstract  Firing behavior test has been carried out and physical properties of the glazes are calculated by using mathematical models describing the properties as additive functions of their oxide composition (OGBC model).. The calculation procedure of optimizing the glaze composition satisfying certain desired properties of the glaze. To Obtain properties of the glaze, mineralogical testing was caried out by AAS and spectrofotometry. The result of firing behavior which has given curve that need to determine level of temperature and OGBC model which has given properties range are used to determine a Good qualitity of glaze. Based on OGBC calculaton, Glaze made from barium oxide and zinc with composition are Felspar 39, Wollastonite 11 Kapur 5, Kaolin 6, Zirkon silikat 11, Dolomit 6, Kuarsa 13, ZnO 2, BaCO 3 2 (on percent weight), barium and zinc content can be reduced and give same quality.The final composition free barium and zinc are : Felspar 42, Wollastonite 12, kapur 5, Kaol...

RANCANG BANGUN TUNGKU BERBAHAN BAKAR LPG DENGAN VOLUME RUANG BAKAR 1 M 3 SUHU BAKAR MAKSIMUM 1300 0 C UNTUK PEMBAKARAN KERAMIK

Abstract A downdraft kiln using LPG as energy source with capacity 1 m 3 and maximum firing temperature 1300 0 C has been constructed. For firing ceramic process, most of Balinese and Lombok craftsmen use firewood as energy source. This method is inefficient from the production rate. Point of view, downdraft kiln can help the craftsmen to process ceramic easier, faster and cheaper. Downdraft kiln using LPG has been selected as an alternative kiln due to minimum pollutant produced compare with updraft kiln using coal or firewood. The kiln constructed has fulfilled the requirement of kiln firing process quality in which the firing causes sintering process in the ceramics body. The kiln with a capacity of 1m 3 can reach a maximum firing temperature which of 1300 0 C. Download Full text (click here)