A glass ceramic is specified, with a crystalline phase consisting predominantly of BPO.sub.4, and preferably exclusively of BPO.sub.4. The glass ceramic contains 10 to 50 wt.-% SiO.sub.2, 5 to 40 B.sub.2O.sub.3, 25 to 75 wt.-% P.sub.2O.sub.5, up to 5 wt.-% refining agents, up to 1 wt.-% impurities, and 0.1 to 10 wt.-% of at least one constituent selected from the group of M3.sub.2O.sub.3, M5.sub.2O.sub.5 and M4O.sub.2, wherein M3 is an element selected from the group of the lanthanoids, yttrium,...

A dielectric ceramic obtained by firing a raw material comprising an alumina powder, a crystallizable glass powder mainly containing SiO.sub.2, CaO and MgO, and a noncrystallizable glass powder mainly containing SiO.sub.2, B.sub.2O.sub.3 and Na.sub.2O. After the firing, the dielectric ceramic contains an alumina crystal phase, a diopside crystal phase (Ca(Mg, Al)(Si, Al).sub.2O.sub.6) and a magnesia-spinel crystal phase (MgAl.sub.2O.sub.4) and has a porosity of not higher than 2.2% when measured...

To provide a ceramic composition and a ceramic wiring board that can be formed by the firing at a low temperature of 1,000.degree. C. or less, has high strength and is advantageous when electronic component regions utilizing a ceramic layer are formed thereon.A raw ceramic material or calcined powder thereof having a composition consisting of 100 parts by mass of a main component that consists of 52 to 62% by mass of SiO.sub.2, 12 to 22% by mass of MgO, and 21 to 32% by mass of CaO and 0.5 to 3 ...

A kiln car has a wheeled base and a superstructure supported above the base, the superstructure comprising a number of tiers of refractory batts supported one tier above the other by a series of props. At least the lowermost tier of batts is supported on at least some of the props through the agency of discs which each have a convex or domed face so as to make point contact either with a batt or the supporting face of the respective prop.

A long alumina ceramic tube having good linearity is made by longitudinally joining shorter alumina tubes at the ends thereof. The ends have tapered surfaces thereat to increase the contact surface of the joint. The contact surface has a thin coating of a alumina containing composition thereon which is fired at a high temperature to provide a secure joint between the shorter alumina tubes.

A ceramic material includes at least 90% of a single phase silicon aluminum oxynitrite having the general formula: where z is greater than 0 and less than or equal to 5. One method of producing the ceramic material involves sintering a mixture including not more than 75% by weight of high active surface area alumina powder of particle size less than 10 microns and silicon nitride powder of particle size less than 20 microns. In another method of producing the ceramic material, a mixture of silic...

A ceramic filter having a honeycomb structure 10 having a large number of cells which are extending in the longitudinal direction and which are alternatively plugged on an exhaust gas G inlet side end face 10a and an exhaust gas G outlet side end face 10b to form plugged portions. The depth of the inlet side plugged portions (filler 16) is formed deeper than that of the outlet side plugged portions (filler 16). Since the exhaust gas G tends to have a decreased turbulent flow and an increased lam...

A ceramic implant having at least one component for permanently connecting resected live bone stumps without the use of bone cement or the insertion of an endoprostheses portion into the intramedullar or marrow space of the bone, the implant including at least one cylindrical sleeve having a truncated conical interior recess with rounded grooves helically formed therein for closely engaging a cooperatively formed live bond stump. The ceramic sleeve may be held to the bone stump by use of surgica...

The invention is relative to a ceramic socket, which is established on the baseboard of lamps and lanterns through bearing leg. The said socket consists of a body and a cap. The lateral side of body where the cap fastens on it and towards the baseboard has wire entrances for polar wires. Polar wires go into the baseboard through their independent entrance connect to corresponding slug and tongue in order to settle wires between the socket and the baseboard. This structure avoids the shadow proje...

A ceramic heater includes a ceramic substrate having a heating face, a resista nce heating element embedded in the substrate and a terminal electrically connected with the resistance heating element. The resistance heating element includes first and second coiled windings. The first winding has a coil diameter that is larger than the coil diameter of the second winding. A non-wound wire may also be used instead of the second winding.