Espumado por microondas de mezclas de silicato de sodio-ortofosfato cálcico dibásico

  1. Vargas, G. 1
  2. Pérez Sánchez, Juan Carlos 1
  3. Méndez, J. 1
  4. Méndez, M. 1
  5. Pena, P. 2
  1. 1 Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Unidad Saltillo
  2. 2 Instituto de Cerámica y Vidrio
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    Instituto de Cerámica y Vidrio

    Madrid, España

    ROR https://ror.org/02h7vfp25

Journal:
Boletín de la Sociedad Española de Cerámica y Vidrio

ISSN: 0366-3175

Year of publication: 2002

Volume: 41

Issue: 5

Pages: 481-486

Type: Article

DOI: 10.3989/CYV.2002.V41.I5.667 DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Boletín de la Sociedad Española de Cerámica y Vidrio

Abstract

The effect of microwave application on the thermal behaviour, volume change, size and pore size distribution as well as chemical reactions and dissolution of sodium silicate/dibasic calcium phosphate ceramic (DCF) samples have been analysed. Ceramics foams with porosities between 71 and 79 wt% and pore sizes ranging from 10 to 200 microns have been obtained. After 90 seconds the temperature of samples reach about 130 °C with a weight loss of 23 wt%. Differences in the proportion of DCF in the initial mixture originate changes in volume and different chemical compounds in the final obtained foams. Additions of 10, 20 and 30 wt% of DCF originates volume increases of 350, 300 and 250 % respectively. In foam samples with 30 wt% of DCF, heated by microwave during 90 sec., the amount of the new compound β-NaCaPO4 was about 42.9 wt%. The other component of this sample, 57.1 wt%, was DCF. Dissolution tests were made, using one gram of sample, in 100 ml of distilled water. The dissolution of 10 wt% DCF foamed samples, after 20 days into water, were 900 ppm/gr of Na and 2.7 ppm/gr of Ca. In samples with 30 wt% of DCF the dissolution were 470 ppm/gr and 5 ppm/gr for Na and Ca respectively.

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