COMPONENT FOR INVESTMENT CASTING MOLD

    公开(公告)号:JPH0796347A

    公开(公告)日:1995-04-11

    申请号:JP14404894

    申请日:1994-06-03

    Applicant: BAYER AG

    Abstract: PURPOSE: To make it possible to cast metal without the occurrence of efflores cence and without changing good mechanical properties by providing a zeolite- containing compound for investment casting molds. CONSTITUTION: When a copy is made from the compound for investment casting molds, the shell resembling the crystal of the fine salt and the efflorescence arise on the surface of a pattern facing the surface of hydrophobic silicone in particular. The compound for investment casting molds which does not give rise to the efflorescence and does not change the good mechanical properties is obtained by incorporating the zeolite therein. The crystalline alumina silicate made from a net structure of a tetrahedron of SiO4 and M2 O4 is adopted for the zeolite. The compound for investment casting molds is generally used for casting of metal and restoration and duplication of precious metallic members. An adequate field of use is the field of dental techniques of making denture members by using the compound for investment casting molds.

    ENRICHMENT METHOD BY ADSORBING OXYGEN IN AIR WITH MIXTURE OFMOLECULAR SIEVE AND ZEOLITE

    公开(公告)号:JPH08309180A

    公开(公告)日:1996-11-26

    申请号:JP14236996

    申请日:1996-05-14

    Applicant: BAYER AG

    Abstract: PROBLEM TO BE SOLVED: To improve an oxygen yield and to enrich oxygen in air with low energy by respectively specifying an inlet temp. and kinds of zeolites, in a process for oxygen enrichment by the use of combined zeolite fillers depending on the inlet temp. SOLUTION: A packing comprising Na-Ca zeolite X having the SiO2 /Al2 O3 ratio of 2.0-2.5 and the CaO/Al2 O3 ratio of 0.4-0.75 is provided at an air inlet side of a vacuum swing adsorber, or the like. The ratios are dependent upon the air inlet temp., and at an air inlet temp. of 20-30 deg.C, the CaO/Al2 O3 ratio of the Na-Ca zeolite X is 0.4-0.6, at an inlet temp. of 30-40 deg.C, the ratio is 0.55-0.65, and at an inlet temp. of 40-50 deg.C, the ratio is 0.6-0.75. The packing at the air outlet side of the adsorber comprises Na-Ca zeolite A with a CaO/Al2 O3 ratio of 0.5-1.0 or Na-Ca zeolite X with a CaO/Al2 O3 ratio of 0.5-1.0, wherein the ratio is higher than that of the inlet side. Thereby, N2 /O2 selectivity of the packing is improved, to enrich oxygen in air.

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