A sintered MnZn ferrite body containing main components comprising 53.30-53.80% by mol of Fe calculated as Fe.sub.2O.sub.3, 6.90-9.50% by mol Zn calculated as ZnO, and the balance of Mn calculated as MnO, and sub-components comprising 0.003-0.020 parts by mass of Si calculated as SiO.sub.2, more than 0 parts and 0.35 parts or less by mass of Ca calculated as CaCO.sub.3, 0.30-0.50 parts by mass of Co calculated as Co.sub.3O.sub.4, 0.03-0.10 parts by mass of Zr calculated as ZrO.sub.2, and 0-0.05 parts by mass of Ta calculated as Ta.sub.2O.sub.5, pre 100 parts by mass in total of the main components (calculated as the oxides), and having an average crystal grain size of 3 m or more and less than 8 m and a density of 4.65 g/cm.sup.3 or more.

A positive electrode active material for a non-aqueous electrolyte secondary battery includes secondary particles of a lithium transition metal complex oxide as a main component. The main component is represented by a formula: Li.sub.t(Ni.sub.1-xCo.sub.x).sub.1-yMn.sub.yB.sub.P.sub.S.sub.O.sub.2, where t, x, y, , , and satisfy inequalities of 0x1, 0.00y0.50, (1x).Math.(1y)y, 0.0000.020, 0.000=0.030, 0.0000.030, and 1+3+3+2t1.30, and satisfy at least one of inequalities of 0.002, 0.006, and 0.004. The secondary particles exhibit a pore distribution, where a pore volume Vp(1) having a pore diameter of not less than 0.01 m and not more than 0.15 m satisfies an inequality of 0.035 cm.sup.3/gVp(1) and where a pore volume Vp(2) having a pore diameter of not less than 0.01 m and not more than 10 m satisfies an inequality of Vp(2)0.450 cm.sup.3/g.

A positive electrode active material for a non-aqueous electrolyte secondary battery includes secondary particles of a lithium transition metal complex oxide as a main component. The main component is represented by a formula: Li.sub.t(Ni.sub.1-xCo.sub.x).sub.1-yMn.sub.yB.sub.P.sub.S.sub.O.sub.2, where t, x, y, , , and satisfy inequalities of 0x1, 0.00y0.50, (1x).Math.(1y)y, 0.0000.020, 0.0000.030, 0.0000.030, and 1+3+3+2t1.30, and satisfy at least one of inequalities of 0.002, 0.006, and 0.004. The secondary particles exhibit a pore distribution, where a pore volume Vp(1) having a pore diameter of not less than 0.01 m and not more than 0.15 m satisfies an inequality of 0.035 cm.sup.3/gVp(1) and where a pore volume Vp(2) having a pore diameter of not less than 0.01 m and not more than 10 m satisfies an inequality of Vp(2)0.450 cm.sup.3/g.

This disclosure enables direct 3D printing of preceramic polymers, which can be converted to fully dense ceramics. Some variations provide a preceramic resin formulation comprising a molecule with two or more CX double bonds or CX triple bonds, wherein X is selected from C, S, N, or O, and wherein the molecule further comprises at least one non-carbon atom selected from Si, B, Al, Ti, Zn, P, Ge, S, N, or O; a photoinitiator; a free-radical inhibitor; and a 3D-printing resolution agent. The disclosed preceramic resin formulations can be 3D-printed using stereolithography into objects with complex shape. The polymeric objects may be directly converted to fully dense ceramics with properties that approach the theoretical maximum strength of the base materials. Low-cost structures are obtained that are lightweight, strong, and stiff, but stable in the presence of a high-temperature oxidizing environment.

This disclosure enables direct 3D printing of preceramic polymers, which can be converted to fully dense ceramics. Some variations provide a preceramic resin formulation comprising a molecule with two or more CX double bonds or CX triple bonds, wherein X is selected from C, S, N, or O, and wherein the molecule further comprises at least one non-carbon atom selected from Si, B, Al, Ti, Zn, P, Ge, S, N, or O; a photoinitiator; a free-radical inhibitor; and a 3D-printing resolution agent. The disclosed preceramic resin formulations can be 3D-printed using stereolithography into objects with complex shape. The polymeric objects may be directly converted to fully dense ceramics with properties that approach the theoretical maximum strength of the base materials. Low-cost structures are obtained that are lightweight, strong, and stiff, but stable in the presence of a high-temperature oxidizing environment.

The invention relates to a fire-resistant ceramic product, a batch for manufacturing a product of said type, and a process for manufacturing a product of said type.

There is provided a process for manufacturing a carbonaceous anode for an electrolysis cell for the production of aluminium. The process comprises contacting coke particles with a boron-containing solution to obtain boron-impregnated coke particles, mixing the boron-impregnated coke particles with coal tar pitch to form an anode paste, and forming a green anode with the anode paste. A carbonaceous anode for an electrolysis cell for the production of aluminium is also provided, which comprises at least a first fraction of coke particle, a second fraction of coke particles and coal tar pitch, wherein at least the first faction of coke particles comprises boron-impregnated coke particles, the boron-impregnated coke particles being distributed throughout the carbonaceous anode. The carbonaceous anode presents good resistivity towards air and CO.sub.2 oxidation, which translates into less dusting of the anode, thus improving its integrity throughout its lifetime.

A ferrite sintered body contains Fe, Mn, Zn, Cu, and Ni. Supposing that Fe, Mn, Zn, Cu, and Ni are converted into Fe.sub.2O.sub.3, Mn.sub.2O.sub.3, ZnO, CuO, and NiO, respectively, and the sum of the contents of Fe.sub.2O.sub.3, Mn.sub.2O.sub.3, ZnO, CuO, and NiO is 100 mol %, the sum of the contents of Fe.sub.2O.sub.3 and Mn.sub.2O.sub.3 is 48.47 mol % to 49.93 mol %, the content of Mn.sub.2O.sub.3 is 0.07 mol % to 0.37 mol %, the content of ZnO is 28.95 mol % to 33.50 mol %, and the content of CuO is 2.98 mol % to 6.05 mol %. Furthermore, 102 ppm to 4,010 ppm Zr in terms of ZrO.sub.2 and 10 ppm to 220 ppm Al in terms of Al.sub.2O.sub.3 are contained per 100 parts by weight of the sum of the amounts of contained Fe.sub.2O.sub.3, Mn.sub.2O.sub.3, ZnO, CuO, and NiO.

A ferrite sintered magnet includes a composition expressed by a formula (1) of Ca.sub.1-w-xLa.sub.wA.sub.xFe.sub.zCo.sub.mO.sub.19. In the formula (1), w, x, z, and m satisfy a formula (2) of 0.30w0.50, a formula (3) of 0.08x0.20, a formula (4) of 8.55z10.00, and a formula (5) of 0.20m0.40. In the formula (1), A is at least one kind of element selected from a group consisting of Sr and Ba. Cr is further contained at 0.058 mass % to 0.132 mass % in terms of Cr.sub.2O.sub.3.

A method of producing low CTE graphite electrodes from needle coke formed from a coal tar distillate material having a relatively high initial boiling point.