| http://www.w3.org/ns/prov#value | - In order to solve this problem, various investigations have been made concerning improvements in a sintering process wherein sintering is carried out by hot isotropic pressing following pre-sintering at normal pressure; the addition of binders to decrease sintering temperature such as phosphates of strontium, calcium and barium, bioactive glass and nitrogenous glass; the use of sintered substrates
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