Sains Malaysiana 46(10)(2017): 1979–1786

http://dx.doi.org/10.17576/jsm-2017-4610-37

 

Kesan Suhu Pensinteran terhadap Sifat Mekanik dan Mikrostruktur Alumina-Zirkonia yang Difabrikasi dengan Kaedah Pengacuan Suntikan Seramik

(Effect of Sintering Temperature on the Mechanical Properties and Microstructure of Alumina-Zirconia Fabricated via Ceramic Injection Moulding Method)

 

SARIZAL MD ANI, ANDANASTUTI MUCHTAR*, NORHAMIDI MUHAMAD & JAHARAH A. GHANI

 

Jabatan Kejuruteraan Mekanik dan Bahan, Fakulti Kejuruteraan dan Alam Bina, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Diserahkan: 7 Mei 2017/Diterima: 21 Julai 2017

 

 

ABSTRAK

Kesan suhu pensinteran terhadap sifat mekanik dan mikrostruktur bahan komposit alumina-zirkonia telah dikaji. Jasad hijau alumina-zirkonia difabrikasi dengan menggunakan kaedah pengacuan suntikan seramik menggunakan sistem bahan pengikat pelbagai komponen. Jasad perang yang terhasil selepas proses penyahikatan disinter pada suhu 1400, 1450, 1500, 1550, 1600 dan 1650°C selama 2 jam. Selanjutnya nilai ketumpatan, kekerasan dan keliatan patah bagi jasad tersinter diukur. Mikrostruktur jasad tersinter ditentukan dengan menggunakan mikroskop imbasan elektron (SEM). Kajian menunjukkan nilai ketumpatan, kekerasan dan keliatan patah bagi jasad tersinter meningkat sejajar dengan peningkatan suhu pensinteran. Hasil uji kaji juga mendapati pada suhu pensinteran 1650°C sifat mekanik bahan mencapai keadaan maksimum. Penumpatan jasad tersinter 98% menghampiri ketumpatan teori dengan nilai kekerasan 16.9 GPa dan keliatan patah mencecah 3.95 MPa.m1/2. Keputusan tersebut dapat dikaitkan dengan mikrostruktur bahan yang padat didorong oleh tumbesaran ira yang lengkap.

 

Kata kunci: Alumina-zirkonia; pengacuan suntikan seramik; suhu pensinteran

 

ABSTRACT

The effects of sintering temperature on the mechanical properties and microstructure of alumina-zirconia composite were investigated. Alumina-zirconia parts were successfully fabricated via ceramic injection moulding method using a multi-component binder system. The debound parts were sintered at temperatures of 1400, 1450, 1500, 1550, 1600 and 1650°C for 2 h after debinding process. Furthermore, the density, hardness and fracture toughness of the sintered parts were measured. The microstructure of the sintered part was observed via scanning electron microscope. The results showed that the density, hardness and fracture toughness of the sintered parts increase with increasing sintering temperature. The experimental results also indicate that the mechanical properties of the materials achieve maximum conditions at a sintering temperature of 1650°C. The densification of the sintered parts is close to 98.1% of the theoretical density with a hardness of 16.9 GPa and a fracture toughness of 3.95 MPa.m1/2. The results can be attributed to the microstructure of the dense material being driven by complete grain growth.

 

Keywords: Alumina-zirconia; ceramic injection moulding; sintering temperature

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*Pengarang untuk surat-menyurat; email: muchtar@ukm.edu.my