Abstract: Making denser ceramic sinters by carrying out the sintering operation at elevated temperatures and in 100% oxygen at a pressure of at least 1.5 atmospheres, and then cooling the sinter without control of the ambient atmosphere. The product has a bulk density of at least 98% of the theoretical density of the sinter.

Abstract: A method of fine-tuning the dielectric constant value of an insulating ceramic alloy, and the resulting alloy, and uses thereof, are disclosed. The alloy has the general formula:Mg.sub.x Al.sub.y Ti.sub.z 04whereinx+y+z=3x=1-2y=0.1-1.9z=0.1-0.9and can be made from 10 to 90 mol percent of magnesium titanate and 90 to 10 mol percent of magnesium aluminate. The mol ratio of the titanate to the aluminate in the alloy is varied in order to vary the value of the dielectric constant of the alloy.The alloy can be used in applications such as a dielectric plate for ceramic filters for cellular telephones.

Abstract: A method of fine-tuning the dielectric constant value of an insulating ceramic alloy, and the resulting alloy, and uses thereof, are disclosed. The alloy has the general formula:Mg.sub.x Al.sub.y Ti.sub.z O.sub.4whereinx+y+z=3x=1-2y=0.1-1.9z=0.1-0.9and is preferably made from 10 to 90 mol percent of magnesium titanate and 90 to 10 mol percent of magnesium aluminate. The mole ratio of the titanate to the aluminate in the alloy is varied in order to vary the value of the dielectric constant of the alloy. The alloy has a density which is at least 98% of the theoretical density of the alloy, and a dielectric constant of 8.5 to 13.8.The alloy can be used in applications wherein dielectric materials have previously been utilized, such as a substrate for an electrical circuit.

Abstract: A method of fine-tuning the dielectric constant value of an insulating ceramic alloy, and the resulting alloy, and uses thereof, are disclosed. The alloy has the general formula:Mg.sub.x Al.sub.y Ti.sub.z O.sub.4whereinx+y+z=3x=1-2y=0.1-1.9z=0.1-0.9and is preferably made from 10 to 90 mol percent of magnesium titanate and 90 to 10 mol percent of magnesium aluminate. The mole ratio of the titanate to the aluminate in the alloy is varied in order to vary the value of the dielectric constant of the alloy. The alloy has a density which is at least 98% of the theoretical density of the alloy, and a dielectric constant of 8.5 to 13.8.The alloy can be used in applications wherein dielectric materials have previously been utilized, such as a substrate for an electrical circuit.

Abstract: A door assembly for a high temperature oven is disclosed, including a door frame having a cavity which is at least in part wedge-shaped and having apertures through the frame with a resilient seal surrounding the aperture. A door is located within the cavity, and moves in a generally vertical direction from an open position wherein the door is out of contact with the resilient seal and is displaced from the area between the apertures to provide unimpeded passage therethrough, to a closed position wherein the wedge shape causes the door to firmly seal against the resilient seal so that the substantial escape of gases through the closed door does not occur.

Abstract: An oven system for the continuous firing of bindered ceramic materials includes a conveyer, a burnout section, and an oven section. The burnout section burns binder out of the ceramic materials without substantial firing of the ceramic materials. The oven section fires the ceramic materials at a temperature of 800.degree. C. to 1600.degree. C. in an oxygen atmosphere. The oxygen in the oven is at a pressure of at least one-half atmosphere, so that the ceramic products are at least substantially in the oxide form and have a density of at least 98% of the theoretical density. The oven has a wedge shaped door which interacts with a wedge shaped cavity to seal the door.