This study developed the cemented tungsten carbide by steadily sintering at 1430 °C for one hour. The tungsten carbide structure is a long shape. Its grain size has a difference between width and length and there are high distribution of sizes and shapes. In comparison with the work piece which has the similar size of grain structure the milling duration of tungsten carbide is less even though the condition of WC-Co is the same (95% WC – 5% Co). When the sintering of 1400 °C with the identical milling duration is performed. It turned out that both grain structures of the tungsten carbide and the work piece are similar and their grain sizes are slightly different. However when the grain structures are almost the same and sphericity is increased the hardness and wear resistance will also be improved. Therefore the size of grain structure between 1.00 – 3.00 μm with the milling duration of 100 hours will provide a work piece that has a wear resistance according to international standard

The purpose of this study is to study 3 formula basic formula cereal bar and study the using crispy riceberry flake to replace rolled oats in cereal bar in 4 levels : 0% 50% 75% and 100%. The experiment is analyzed by Randomized Complete Block Design ( RCBD ) to evaluate the sensory quality in appearance color flavor taste texture and overall preference. The sensory evaluation is tested by 9 – Point Hedonic scale and evaluated by 40 subjects for study 3 formula basic and 80 subjects for study the using crispy riceberry flake to replace rolled oats. It is Analyzed by Analysis of Variance ( ANOVA ) and Least Significant Difference ( LSD ) and Duncan’s New Multiple Range Test ( DMRT ). The result of the study showed that the basic formula is the sensory evaluation is statistically significant ( P ≤ 0.05 ) of third formula. After the sensory evaluation of the appearance color flavor taste texture and overall basic formula which is mostly accepted. Scores are in the high level because the fact is chewy enough of it. As for the result of the study for using crispy riceberry flake to formula is replace the rolled oats in cereal bar it is sensory evaluation is statistically significant ( P ≤ 0.05 ) of 50% formula. After the sensory evaluation of the appearance color flavor taste texture and overall which is mostly accepted. Scores are in the high level and moderate because when to more replace in 75% and 100% while the solid of texture in cereal bar. So 50% formula is appropriate of study the using crispy riceberry flake to replace rolled oats in cereal bar.