Search results

Sort By:

Limit search:

Characterization Investigations of W-Ni Matrix Composites Reinforced with TiB_2 and La_2O_3

100%

Gökçe H., Balcı Ö., Ağaoğulları D., Demirkan Ö., Genç A., Öveçoğlu M., Duman İ.

Acta Physica Polonica A

2013

vol. 123

issue 2

309-312

W-1 wt% Ni (W1Ni) matrix composites reinforced with TiB_2 and La_2O_3 particles were fabricated via mechanical alloying and activated sintering methods. Powder blends with compositions of W1Ni-2 wt% TiB_2-x wt% La_2O_3 (x = 0.5, 1) were mechanically alloyed for 6 and 12 h. The results showed that increase in mechanical alloying duration to 12 h causes the decline of grain sizes of the W-Ni matrix to nanoscales. TiB_2/La_2O_3 particles have a significant effect on the density/microhardness values and wear amounts of the sintered samples.

Nano-Bioceramic Synthesis from Tropical Sea Snail Shells (Tiger Cowrie - Cypraea Tigris) with Simple Chemical Treatment

84%

Şahin Y., Gündüz O., Bulut B., Özyeğin L., Gökçe H., Ağaoğulları D., Chou J., Kayalı E., Ben-Nissan B., Oktar F.

Acta Physica Polonica A

2015

vol. 127

issue 4

1055-1058

In this study several bioceramic materials (i.e. hydroxyapatite, whitlockite) were prepared by using chemical synthesis method from sea snail shells (Tiger Cowrie - Cypraea Tigris), originated from Pacific Ocean. Marine shells usually present aragonite-calcite structures and generally, complicated and pressurized equipment is necessary to convert these structures into bioceramics. Instead of using complicated systems, a basic ultrasonic equipment and simple chemical synthesis method was used in the process. DTA analysis was performed to calculate the required amount of H₃PO₄ solution in order to set the appropriate stoichiometric ratio of Ca/P equal to 1.667 for HA bioceramic or to 1.5 for β-TCP bioceramic in the titration. The prepared batches were sintered at 800°C and 400°C for hydroxyapatite (HA) and β-tri calcium phosphate (β-TCP) forms respectively. X-ray diffraction analysis, scanning electron microscopy (SEM) and infrared observations (FTIR) were implemented for both TCP and HA bioceramics. By applying the chemical synthesis with basic ultrasonic equipment, this study proposes a simple way of production for nano-HA /TCP powders from a natural marine sources.

Refine search results

2 Acta Physica Polonica A

1 2015

1 2013

2 Ağaoğulları D.

2 Gökçe H.

1 Balcı Ö.

1 Ben-Nissan B.

1 Bulut B.

1 Chou J.

1 Demirkan Ö.

1 Duman İ.

1 Genç A.

1 Gündüz O.

1 Kayalı E.

1 Oktar F.

1 Öveçoğlu M.

1 Özyeğin L.

1 Şahin Y.

Search results

Characterization Investigations of W-Ni Matrix Composites Reinforced with TiB_2 and La_2O_3

Nano-Bioceramic Synthesis from Tropical Sea Snail Shells (Tiger Cowrie - Cypraea Tigris) with Simple Chemical Treatment