Strengthening of multilayer ceramic/glass articles

A method for strengthening ceramic/glass substrates comprising the steps of:

• (1) preparing at least first and second slurries, said first and second slurries comprising, respectively, first and second ceramic/glass powder mixtures, wherein said first and second ceramic/glass mixtures comprising about 20-100 wt % glass material and about 0-80 wt % ceramic material and said first ceramic/glass powder mixture would exhibit a greater thermal expansion coefficient after sintering than said second ceramic/glass powder mixture said first and second slurties further comprising other additives such as solvent, binder, dispersion agent, plasticizer;
• (2) preparing at least first and second precursory substrates from corresponding said first and second slurties from step (1);
• (3) preparing a laminated precursory substrate under a laminating condition by stacking and applying heat and pressure thereon, a plurality of said at least first and second precursory substrates from step (2) in such a manner that at least one of said first precursory substrate is sandwiched between at least two of said second precursory substrates;
• and
• (4) sintering said laminated precursory substrate under a sintering condition by placing the same in a furnace and applying heat thereto.