A method of manufacturing a heat exchanger core from glass ceramic matrix composite includes placing one or more reinforcing fibers around one or more mandrels into a mold cavity. A glass matrix material infiltrates the one or more reinforcing fibers to produce an infiltrated core and the one or more mandrels is removed to create one or more passages passing through the infiltrated core.

Method for manufacturing coloured glass-ceramic slab articles from a base mix, including the steps of (a) preparing a mix comprising a colouring pigment, at least one binder and a preponderant amount of a glass frit having a specific composition, (b) distributing the mix in a forming support, (c) compacting the mix, (d) drying the mix, (e) sintering the compacted and dried mix by firing to obtain a slab article, and (f) cooling the articles under conditions such as to preventeven partialdevitrification and/or crystallization of the glass frit. Also relating to a glass frit for manufacturing base mixes and a coloured glass-ceramic slab article obtained from the base mix.

A glass-ceramic material includes an oxynitride glass with a chemical formula Ca.sub.7Al.sub.14Si.sub.17OsN.sub.7 and zinc oxide. The zinc oxide is present in an amount of 8 to 16 percent by weight based on the total weight of the glass-ceramic material. The zinc oxide is doped in the oxynitride glass. The glass-ceramic material has one or more conductive channels having a length of 100 to 1000 m and a width of 0.5 to 10 m.

A process of forming a titania-silica glass body, the process including exposing a titania-doped silica soot body to a constant steam pressure step during which the partial steam pressure is at a first partial pressure of steam P1 that is from about 0 Torr to about 760 Torr and exposing the soot body to a ramp-up steam pressure step during which the partial steam pressure increases from the first partial pressure of steam P1 to a second partial pressure of steam P2, the second partial pressure of steam P2 being from about 50 Torr to about 760 Torr. The second partial pressure of steam P2 being greater than the first partial pressure of steam P1. The process further including heating the soot body during the constant steam pressure step and during the ramp-up steam pressure step and increasing the temperature during at least one of the constant steam pressure step and the ramp-up steam pressure step.

A method of forming a glass container includes providing a glass parison having a tubular wall that includes an inside surface, which defines an interior parison cavity open at one axial end of the tubular wall, and an outside surface. The tubular wall includes an expandable blow portion that has a forming viscosity between 10.sup.7.5 Pa.Math.s and 10.sup.5.5 Pa.Math.s and is also in an isoviscous state. The glass parison is blow molded into a glass container by introducing a compressed gas into the interior parison cavity to thereby cause the expandable blow portion of the tubular wall to expand outwardly into a portion of a wall that defines the glass container.

Disclosed is a pre-sintered ceramic block for a dental restoration, which has a low pre-sintering temperature, contains a silica main crystal phase, but does not contain or contains a small amount of lithium metasilicate crystal phase. The pre-sintered ceramic block has a low hardness, with a Vickers hardness of 0.5-3 GPa, which is significantly lower than that of a ceramic block containing a lithium metasilicate crystal phase, and same is suitable for dry machining and also wet machining when being machined into a dental restoration.