Caratteristiche della sabbia gioiello
- Forma del grano sferica: la forma del grano è vicina al vero cerchio, la superficie è liscia e non ci sono venature concave e convesse. Le sue proprietà di fluidità e riempimento sono buone e si ottengono una buona formabilità e resistenza dello stampo di fusione. Buona collassabilità, sabbia facile da pulire. Viene utilizzato meno legante rispetto ad altri stampi di sabbia di fusione granulare.
- Bassa velocità di espansione termica: la bassa velocità di espansione termica è la stessa di quella di sabbie speciali come il minerale di cromo, quindi la precisione dimensionale delle fusioni di produzione è elevata, le crepe e i difetti superficiali sono pochi e la resa della fusione è elevata.
- Buona resistenza alla frantumazione: la sabbia Baozhu ha una buona compattezza, un’elevata resistenza, anche se riciclata, si rompe raramente, riducendo l’inquinamento della polvere nel processo di produzione della fusione nell’ambiente di produzione, buona riciclabilità, riduzione delle emissioni di rifiuti industriali e favorevole alla protezione ambientale.
- Buona resistenza al fuoco: il componente principale è l’allumina, quindi la resistenza al fuoco è molto buona. Il refrattario ≥ 1850 °C può essere applicato alla fusione di vari metalli e leghe.
- Bassa densità apparente: bassa densità apparente, rispetto al minerale di cromo e alla sabbia di zircone (densità) la sabbia di Baozhu ha una densità inferiore, il peso della sabbia utilizzata durante la realizzazione dello stesso modello (nucleo) è molto inferiore a quello del minerale di cromo, della sabbia di zircone, riducendo di conseguenza i costi di produzione, in base al rapporto di volume, solo il 50% del minerale di cromo, il 30% della sabbia di zircone.
- Materiale neutro: valore PH 6-7, proprietà chimiche stabili, resistenza all’erosione acida e alcalina, basso valore di consumo di acido. Possono essere utilizzati sia leganti acidi che alcalini.
Rispetto al minerale di cromite e allo zircone, il suo prezzo è solo sabbia di zircone, minerale di cromite 25 – 50% 。 Allo stesso tempo, poiché il grano di sabbia è sferico e la sua area superficiale è piccola, la quantità di resina aggiunta può essere ridotta del 30-50% e la quantità di vetro d’acqua aggiunta ≤ 4%; E ridurre i difetti di fusione causati dal legante e migliorare la resa delle fusioni
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