Studi Pengaruh Adisi Serbuk Kayu Terhadap Morfologi, Sifat Mekanis, dan Sifat Termal dari Keramik Berpori Berbasis Mullite Sebagai Kandidat Filter Pressure Filtration (Prefil) = Study of the Effect of Wood Saw Dust Addition on Morphology, Mechanical Properties, and Thermal Properties of Mullite-Based Porous Ceramics as Pressure Filtration (Prefil) Filter Candidates