Filter for aluminum hot melt having a partially crystalline bind

Details Filter for aluminum hot melt having a partially crystalline bind Filter for aluminum hot melt having a partially crystalline bind

1991-02-26

1992-05-19

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 32, 2105101, C03C 1400, C03C 814

Patent

active

051148820

ABSTRACT:
A filter for aluminum hot melt comprises alumina aggregate particles and an inorganic binder in an amount of 5 to 20 parts by weight bound to 100 parts by weight of said alumina aggregate particles. The inorganic binder is composed to 15 wt % to 80 wt % of B.sub.2 O.sub.3, 2 wt % to 60 wt % of Al.sub.2 O.sub.3, 0 wt % to 30 wt % of CaO and 5 wt % to 50 wt % of MgO, and the presence of a highly crystalline binder in the filter yields better properties such as an increase in chemical durability and a lower thermal expansion coefficient where the crystallinity is defined by a peak height of 9Al.sub.2 O.sub.3 -2B.sub.2 O.sub.3 at 2.theta.=16.5.degree. being not less than 30% of a peak-height of .alpha.-Al.sub.2 O.sub.3 at 2.theta.=43.4.degree. when measured by powder X-ray diffractometry and is obtained by a cooling rate of less than 70.degree. C./hr.

REFERENCES:
patent: 3524548 (1970-08-01), McDonald et al.
patent: 4510253 (1985-04-01), Felice et al.
patent: 4528099 (1985-07-01), Rieger et al.

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