Disclosed herein is a sintered ceramic body comprising from 90% to 99.9% by volume of polycrystalline yttrium aluminum garnet (YAG) as measured using XRD and image processing methods and a volumetric porosity of from 0.1 to 4% as calculated from density measurements performed in accordance with ASTM B962-17. The sintered ceramic body may have a total purity of 99.99% and greater and a grain size of from 0.3 to 8 μm. A method of making the sintered ceramic body is also disclosed.

The present invention relates to different inorganic ceramic coatings whose chemical compositions comprise silicates, acids, metallic oxysalts such as tungstates and molybdates, water, and non-metallic oxides such as silicon oxide. Said water-based inorganic ceramic coatings improve the ceramic, anti-corrosive and resistance properties of the metal substrates that are coated with same. Likewise, the present invention relates to a sol-gel process for synthesizing said coatings in which the non-metallic oxide, before being mixed with the rest of the components of the chemical compositions as claimed, can be pre-treated with hydrochloric acid and ammonium hydroxide, or can be sonicated to achieve a particle size in the range from approximately 160 to approximately 180 nm. Finally, the present invention also relates to a method for coating the metal parts with the inorganic ceramic coatings as claimed in the present invention.

A method of making a plurality of composite granules can include: forming green body granules comprising an aluminosilicate; heating the green body granules to form sintered granules; cooling the sintered granules according to a cooling regime, wherein the cooling regime comprises a temperature hold between 700° C. and 900° C. for at least one hour. In a particular embodiment, the aluminosilicate for making the composite granules can have a particle size less than 150 μm. The composite granules are particularly suitable as roofing granules and can have a desired combination of high solar reflectance SR and low lightness L*, a low bulk density, good weather resistance and strength.

A method of making an Al—B.sub.4C composite with Mg addition comprising providing a first mixture of B.sub.4C, Al and Mg powder, producing a powder mixture, adding Mg to the powder mixture, forming pellets, creating a composite, annealing the composite, and forming an Al—Mg—B.sub.4C composite. An Al—B.sub.4C composite with Mg addition comprising Al, Mg comprising 4 wt. %, and B.sub.4C comprising 8 wt. %. An Al—B.sub.4C composite with Mg addition made from the steps comprising providing a first mixture of B.sub.4C, Al and Mg powder, producing a powder mixture, adding Mg to the powder mixture, forming pellets, creating a composite, annealing the composite, and forming an Al—Mg—B.sub.4C composite.

A method to increase the thermal stress capability of a porous TBC and layer system. Due to a post treatment step to a pose TBC coating cracks are produced inside the post TBC advantages manner to increase the thermal stress capability of the ceramic coating by only heating the surface of the ceramic coating.

A method of altering a surface of a ceramic matrix composite to aid in nodule removal is described. A fiber preform comprising a framework of ceramic fibers is heated to a temperature at or above a melting temperature of silicon. During the heating, the fiber preform is infiltrated with a molten material comprising silicon. After the infiltration, the fiber preform is cooled, and the infiltrated fiber preform is exposed to a gas comprising nitrogen during cooling. Silicon nitride may be formed by a reaction of free (unreacted) silicon at or near the surface of the infiltrated fiber preform with the nitrogen. Thus, a ceramic matrix composite having a surface configured for easy nodule removal is formed. Any silicon nodules formed on the surface during cooling may be removed without machining or heat treatment.

The present disclosure belongs to the field of biological materials, and particularly relates to a multilayer zirconia ceramic with uniform transition and a method for preparing the same. The specific technical solution of the present disclosure is as follows: a zirconia ceramic with a formula comprising, in percentage by mass, 0-3% of lanthana, 1.5-16% of yttria, 0-2.5% of silicon carbide nano-whiskers, and 0-1.5% of a coloring agent, the balance being zirconia. Correspondingly provided are a multi-layer zirconia ceramic with uniform transition prepared using the formula and a method for preparing the same. By using the method of the present disclosure, multilayer zirconia ceramics with good and uniformly transitioning core properties can be quickly and conveniently prepared, meeting the requirements of patients with dental disorders on the use and esthetics of dentures.

Disclosed is a method for making a ceramic matrix composite. The method includes infiltrating an initial ceramic matrix composite with a molten silicon infiltration material to form a silicon infiltrated composite; cooling the silicon infiltrated composite; heating a first portion of the cooled silicon infiltrated composite to a temperature in excess of the melt temperature of the silicon infiltration material in the presence of a carbon source; heating a second portion of the cooled silicon infiltrated composite to a temperature in excess of the melt temperature of the silicon infiltration material in the presence of a carbon source after heating the first portion; and cooling the heated portions to form a final ceramic matrix composite, wherein the first portion and second portion of the cooled silicon infiltrated composite are adjacent or overlap.

A method to increase the thermal stress capability of a porous TBC and layer system. Due to a post treatment step to a pose TBC coating cracks are produced inside the post TBC advantages manner to increase the thermal stress capability of the ceramic coating by only heating the surface of the ceramic coating.

A method of making a sintered ceramic body comprising the steps of disposing a ceramic powder (5) inside an inner volume of a spark plasma sintering tool (1), wherein the tool comprises: a die (2) comprising a sidewall comprising inner and outer walls, wherein the inner wall has a diameter defining the inner volume; upper and lower punches (4,4′) operably coupled with the die, wherein each of the punches have an outer wall defining a diameter less than the diameter of the die inner wall, thereby creating a gap (3) between the punches and the inner wall when at least one of the punches are moved within the inner volume, and the gap is from 10 μm to 70 μm wide; creating vacuum conditions inside the inner volume; moving at least one of the punches to apply pressure to the ceramic powder while heating, and sintering; and lowering the temperature of the sintered body.