Metallic porous materials have many interesting combinations of physical and geometrical properties with very low specific weight or high gas permeability. In this study, highly porous Cu foam is successfully fabricated by a slurry coating process. The Cu foam is fabricated specifically by changing the coating amount and the type of polyurethane foam used as a template. The processing parameters and pore characteristics are observed to identify the key parameters of the slurry coating process and the optimized morphological properties of the Cu foam. The pore characteristics of Cu foam are investigated by scanning electron micrographs and micro-CT analyzer, and air permeability of the Cu foam is measured by capillary flow porometer. We confirmed that the characteristics of Cu foam can be easily controlled in the slurry coating process by changing the microstructure, porosity, pore size, strut thickness, and the cell size. It can be considered that the fabricated Cu foams show tremendous promise for industrial application.

Metal foams have a cellular structure consisting of a solid metal containing a large volume fraction ofpores. In particular, open, penetrating pores are necessary for industrial applications such as in high temperature filtersand as a support for catalysts. In this study, Fe foam with above 90% porosity and 2 millimeter pore size was suc-cessfully fabricated by a slurry coating process and the pore properties were characterized. The Fe and Fe2O3 powdermixing ratios were controlled to produce Fe foams with different pore size and porosity. First, the slurry was preparedby uniform mixing with powders, distilled water and polyvinyl alcohol(PVA). After slurry coating on the polyure-thane(PU) foam, the sample was dried at 80℃. The PVA and PU foams were then removed by heating at 700℃ for 3hours. The debinded samples were subsequently sintered at 1250℃ with a holding time of 3 hours under hydrogenatmosphere. The three dimensional geometries of the obtained Fe foams with an open cell structure were investigatedusing X-ray micro CT(computed tomography) as well as the pore morphology, size and phase. The coated amount ofslurry on the PU foam were increased with Fe2O3 mixing powder ratio but the shrinkage and porosity of Fe foams weredecreased with Fe2O3 mixing powder ratio.

Fe foam with above 90% porosity and 2 millimeter pore size was successfully fabricated by a slurry coating process. In this study, the binder contents were controlled to produce the Fe foam with different pore size, strut thickness and porosity. Firstly, the slurry was prepared by uniform mixing with Fe powders, distilled water and polyvinyl alcohol(PVA) as initial materials. After slurry coating on the polyurethane(PU) foam the sample was dried at 80oC. The PVA and PU foams were then removed by heating at 700oC for 3 hours. The debinded samples were subsequently sintered at 1250oC with holding time of 3 hours under hydrogen atmosphere. The three dimensional geometries of the obtained Fe foams with open cell structure were investigated using X-ray micro CT(computed tomography) as well as the pore morphology, size and phase.

파우더 파운데이션은 사용이 간편하고 수정화장이 용이하여 고객들이 많이 사용하고 있으며, 파우더 파운데이션을 만드는 방법은 건식방식, 소성방식, 그리고 습식방법으로 크게 분류할 수가 있다. 이중 습식방법은 이미 잘 알려진 바와 같이 back injection 방법과 front injection 방법이 있으며, 본 논문에서는 front injection 방법을 사용해 실험을 진행하였다. 실험결과 용매의 종류에 따른 경도 변화를 살펴보면 휘발성 실리콘이나 탄화수소계 휘발성 물질을 이용할 때 보다 정제수를 이용할 때 경도가 높게 나타났으며, 사용감 측면에서는 물보다는 탄화수소계 휘발성 물질과 휘발성 실리콘 등을 사용했을 때, 고객 선호도가 높게 나타났다. 또한 코팅물질 변화에 따른 경도 변화로는 아미노산계 코팅물질을 사용하였을 대 경도가 상승하는 효과를 나타냈으며, 실리콘 코팅 물질을 사용했을 때 경도 상승효과가 미비한 것으로 나타났다. 이러한 결과를 토대로 각 대상 고객에 맞는 처방을 개발하고자 할 때 사용감과 경도의 상관관계를 알고, 처방설계에 이용한다면 고객이 원하는 사용감에 한발 더 접근할 수 있으리라 생각된다.