BİLDİRİ DETAY

Büşra METE, Cansu ÇELTİK, Buğra ÇİÇEK
INVESTIGATION OF NON-STICK EFFECT OF H-BN ON VITREOUS ENAMEL COATINGS
 
Hexagonal boron nitride (h-BN) is an inorganic material which shows superior lubrication effect because of the structure of strong bonds between atoms in layers with the weak Van Der Walls bonds between layers. Non-adhesive coating composition; which includes hexagonal boron nitride (h-BN) having high lubricity forms an inorganic coating layer on the surface of an enamelled pan made of cast iron, is applied by spraying method to surface and then cured. As a result of the preliminary experimental studies made, the non-stick effect of the h-BN layer could not be determined precisely which is applied on the surface onto the vitreous enamelled cast iron samples.Cast iron cookware remains popular among other cookwares thanks to superior heat retention and dissipation properties along with its health benefits and ability to withstand high temperatures without damage. Enamelled cast iron has a glaze coated on the cast iron surface that can prevent rusting, eliminate the need for seasoning and impart dishwasher safe and scratch resistantance properties however it does not provide a non-stick cooking surface. The hexagonal boron nitride (h-BN) which is applied as a top coat layer on cast iron pan, prevent food from adhering to the surface at the time of cooking. Such a coating composition which does not generate harmful gases at the time of heating, can maintain material properties such as corrosion resistance, heat resistance, durability for a long period of time and can exhibit non-adhesivity even at higher temperatures up to 400 °C.It is aimed to improve the tribological properties on the surface by applying h-BN layer on the enamel coating to the cast iron pan and to obtain a coating surface with high quality of non-sticking.The scope of this project is to take the place of existing types of pans (PTFE coated, aluminum pans, ceramic coated pans, stainless steel pans etc.) which are less durable and have relatively low heat capacities by improving the properties of the highly popular cast iron pans which are not preferred by the customer due to labor loss and special care requirements.In this experiment, h-BN solution was sprayed onto the primer enamel coated specimens with a spray gun in order to prioritize the non-sticking property of h-BN. After primer enamel layer, 3 samples were cured 15 minutes at 760 0C. Sample 1 was set as the control group and the top layer was coated with the same enamel composition by the spraying method. As the top layer of the sample 2, 10 grams of h-BN (16 microns) was added to the enamel composition and was coated onto the primer enamel layer (130 microns thickness). On the sample 3, prepared solution which is containing h-BN instead of frit was coated. Three samples were cured for 13 minutes at 760 0C.Sample 2 is not suitable for commercial use because it failed in the sauce test. Sample 3 needs to provide a more homogeneous coating. The process needs to be improved by changing coating parameters such as curing temperature, chemical composition of additives and grain size, thus, future work should focus on adressing this issue.Sample 2 is not suitable for commercial use because it failed in the sauce test. Sample 3 needs to provide a more homogeneous coating. The process needs to be improved by changing coating parameters such as curing temperature, chemical composition of additives and grain size, thus, future work should focus on adressing this issue.

Anahtar Kelimeler: Non-stick coatings, h-BN, vitreous enamel, cookware



 


Keywords: