Características de la arena joya
- Forma de grano esférico: la forma del grano es cercana al círculo verdadero, la superficie es lisa y no hay vetas cóncavas ni convexas. Tiene buenas propiedades de fluidez y relleno, y se obtiene una buena formabilidad y resistencia del molde de fundición. Buena colapsabilidad, arena fácil de limpiar. Se utiliza menos aglutinante que otros moldes de arena de fundición granular.
- Baja tasa de expansión térmica: La baja tasa de expansión térmica es la misma que la de las arenas especiales como el mineral de cromo, por lo que la precisión dimensional de las piezas fundidas de producción es alta, las grietas y los defectos superficiales son pocos y el rendimiento de la fundición es alto.
- Buena resistencia al aplastamiento: la arena Baozhu tiene buena compacidad, alta resistencia, incluso si se recicla, rara vez se rompe, lo que reduce la contaminación del polvo en el proceso de producción de fundición al entorno de producción, buena reciclabilidad, reduce las emisiones de desechos industriales y favorece la protección del medio ambiente.
- Buena resistencia al fuego: el componente principal es alúmina, por lo que la resistencia al fuego es muy buena. El refractario ≥ 1850 °C se puede aplicar para la fundición de diversos metales y aleaciones.
- Densidad aparente pequeña: densidad aparente pequeña, en comparación con el mineral de cromo y la arena de circón (densidad), la arena Baozhu tiene una densidad más baja, el peso de la arena utilizada al hacer el mismo modelo (núcleo) es mucho menor que el del mineral de cromo, la arena de circón, reduce correspondientemente los costos de producción, según la relación de volumen, solo el 50% de mineral de cromo, el 30% de arena de circón.
- Material neutro: valor de pH 6-7, propiedades químicas estables, resistencia a la erosión ácida y alcalina, bajo valor de consumo de ácido. Se pueden utilizar aglutinantes tanto ácidos como alcalinos.
En comparación con el mineral de cromita y el circón, su precio es solo arena de circón, mineral de cromita 25 – 50% 。 Al mismo tiempo, debido a que el grano de arena es esférico y su área de superficie es pequeña, la cantidad de resina agregada se puede reducir en un 30-50% y la cantidad de vidrio de agua agregado ≤ 4%; Y reducir los defectos de fundición causados por el aglutinante y mejorar el rendimiento de las piezas fundidas.
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