New sol–gel refractory coatings on chemically-bonded sand cores for foundry applications to improve casting surface quality

A non-contact 3D method to characterize the surface roughness of castings

“…Due to these drawbacks, contact-type instruments are not suitable for high-speed automated inspection according to Tien et al (2009). Again, Nwaogu et al (2011Nwaogu et al ( , 2012 observed that contact-type instruments are difficult to work with on sand cast surfaces because of high surface roughness encountered and material pick-up which depended on the hardness of the surface measured. Hence, the application of a non-contact and non-destructive method for the characterization of the surface roughness of castings.…”

“…Consequently, measuring surface roughness of cast surfaces is important for quality control. Nwaogu et al (2011) has demonstrated that the surface roughness of cast components can be used to elucidate the performance of foundry coatings. And the results can be used in the improvement of coating formulations and development.…”

Effects of Organic and Inorganic Binder Core on Microstructure and Mechanical Properties of Al Casting Products

“…현재 광범위하게 사용되는 주조용 중자 점결제로는 점토, 중 자오일, 물-유리계, 합성수지 등이 있다. 최근에는 가스의 발생 량이 현저히 낮고 여러 가지 주조결함을 줄일 수 있으며 이와 함께 비교적 중자 생산성이 우수할 뿐만 아니라 환경오염을 저감할 수 있는 중자용 점결제가 개발되어 급속하게 주조산업 현장에 응용되고 있다 [3][4][5][6][7][8][9][10][11]. 주조공정에서 사용되는 중자의 점 결제는 대부분이 유기화합물 점결제(organic binder)로 중자 제 조공정과 주조공정에서 다량의 오염가스가 발생되며, 연소가스 가 주물품 내부에 침투하여 미세기공과 기포를 발생시켜 주물 품의 기계적 특성을 저하시키는 원인이 되고 있다.…”

Foundry Coating Technology: A Review

“…The higher the percent solids, the more protection the coating offers. The solid content of a coating determines some other important parameters of the coating such as the density, viscosity, thickness, coverage etc [48]. Therefore, the knowledge of the amount of solid in the coating is very important for reproducibility of these properties.…”