41results about How to "Improve firing pass rate" patented technology

The invention discloses sanitary ceramics slip and a preparation technology thereof. The sanitary ceramics slip mainly comprises, by weight, 30-70 parts of illite-structure clay, 5-15 parts of kaolin, 6-14 parts of ball clay, 8-13 parts of potassium feldspar, 5-10 parts of pyrophyllite, 5-10 parts of sericite, 0.1-3 parts of dolomite and 40-45 parts of water. Sanitary ceramics prepared from the sanitary ceramics slip are low in firing temperature, little in energy consumption and high in strength, and slip casting qualified rate, semi-finished product qualified rate and firing qualified rate can reach 98%, 96% and 92% respectively.

The invention relates to a zero-firing-shrinkage cordierite honeycomb ceramic carrier and a preparation method thereof. The carrier comprises the following raw materials in percentage by weight: 20-32 wt% of tabular alumina, 4-11 wt% of magnesium oxide, 15-45 wt% of electroquartz, 7-30 wt% of talcum and 10-35 wt% of kaolin, totaling 100%. The carrier also comprises an organic assistant and water. The preparation method comprises the following steps: by using alumina, magnesium oxide, electroquartz, talcum and kaolin as inorganic powder, adding the organic assistant and water, mixing, slurrying, extruding, drying, cutting and firing. The cordierite honeycomb ceramic carrier has the advantages of zero firing shrinkage, high firing qualification rate and low production cost.

The invention relates provides a low-temperature stoneware formula, relating to stoneware. The low-temperature stoneware formula provided by the invention has the advantages that the firing temperature and energy consumption can be obviously reduced and the firing pass rate can be increased. The low-temperature stoneware formula comprises grouting mud and raw glaze, wherein the grouting mud is prepared from potash feldspar, lithium porcelain stone, quartz powder, kaolin, black clay, pyrophyllite powder and ceramic powder; the raw glaze is transparent glaze or matte glaze; the transparent glaze is prepared from potash feldspar, lithium porcelain stone, quartz powder, strontium carbonate, barium carbonate, calcined talc, light calcium carbonate, kaolin and ceramic powder; and the matte glaze is prepared from potash feldspar, lithium porcelain stone, quartz powder, strontium carbonate, alumina, calcined talc, light calcium carbonate, kaolin, calcined zinc oxide and barium carbonate.

The invention discloses large-size thin-wall cordierite honeycomb ceramics carrier mud, which is prepared from inorganic raw materials, an organic binder, water and a silane coupling agent, wherein the inorganic raw materials consist of flake-like talc, flake-like washed kaolin, flake-like aluminium oxide and electroquartz. The silane coupling agent is used for carrying out surface modification on the inorganic raw materials including the flake-like talc, the flake-like washed kaolin, the flake-like aluminium oxide and the electroquartz, and the silane coupling agent forms a substituent group-OSi(CH3)2- on the surface of the raw materials to enable the inorganic raw materials to have hydrophobicity. The large-size cordierite honeycomb ceramics carrier mud prepared from the surface-modified inorganic raw materials has the advantages of small hydration shell thickness and small drying shrinkage and can effectively lower a coefficient of thermal expansion; since the mud has good liquidity, forming pressure is low, the abrasion degrees of forming equipment and moulds can be effectively lowered, meanwhile, the surface substituent group-OSi(CH3)2- can form an -O-Si-O-Si-three-dimensional network in a carrier, green body strength is improved, sintering cracks are reduced, and a high sintering yield can be obtained.

A powerful gas circulating and stirring device of a vacuum induction sintering furnace. The powerful gas circulating and stirring device comprises a vacuum induction furnace body, an induction heating body arranged in the vacuum induction furnace body, an induction coil wound and sleeved on the induction heating body, a vacuum vortex fan, a closed box and a vacuum valve, and the vacuum vortex fan powerfully stirring gas arranged outside the vacuum induction furnace body is connected with the rear end and the front end of the vacuum induction furnace body by connecting an inlet pipeline and an outlet pipeline of the vacuum vortex fan and communicated with a cavity. The powerful gas circulating and stirring device has quite obvious effect of improving gas participation in reaction, sintering yield is increased, energy consumption is effectively lowered, loading rate is increased, pit furnace cooling time is shortened, and productivity is greatly improved.

The invention discloses a preparation method of a honeycomb ceramic regenerator with an ultra-thick outer wall. On the outer wall surface of a mold sleeve outside the honeycomb ceramic regenerator, grooves parallel to the extruding direction of mud are arranged at intervals, and the outer wall of the mold sleeve is The surface is processed so that the surface roughness is above 3.2, and pins are arranged in the mud entry hole on the outer wall of the outer mold casing. Spherical fine particle ceramic raw materials and auxiliary materials are selected, and after kneading, mud refining and aging, the mud is extruded with a mud refining machine. , and then add the mud material to the extrusion die sleeve of the extrusion molding machine to make a honeycomb ceramic green body. After the green body is dried and shaped, it is fired at a high temperature. The heat storage per unit volume of the present invention can be increased by 2% to 5%; heat exchange efficiency It can be increased by 3% to 5% accordingly, and the damage rate of the product in the process of handling, transfer, transportation and application assembly is significantly reduced; the deformation defect in the drying and firing process is significantly reduced, the firing pass rate is increased, and the product is reduced. rate, on the other hand to achieve the purpose of energy saving and emission reduction.

A ceramic firing method includes the steps: a first kiln plate is horizontally arranged in a kiln; a plurality of high-temperature-resistant balls are laid on the first kiln plate; at least two second kiln plates for uniformly supporting at the bottom of a ceramic green body are laid on the plurality of high-temperature-resistant balls, and a gap exists between each adjacent second kiln plates; the ceramic green body is placed on the second kiln plates, and the bottom of the ceramic green body is uniformly supported by the at least two second kiln plates; and the kiln is started up for firing the ceramic green body with the firing temperature of 1100-1300 DEG C for 6-8 hours. According to the method, in the process of firing the ceramic green body, the second kiln plates can relatively move along with the green body shrinkage stress traction, so that the shrinkage stress of the product is released, the deformation problem of a high-end straight-edge product is completely solved, the firing qualified rate of the product is improved, the quality of the product is improved, and the costs are reduced.

The invention belongs to the technical field of honeycomb ceramic materials, and in particular relates to a honeycomb ceramic catalyst carrier and a preparation method thereof. The honeycomb ceramic catalyst carrier of the present invention uses alumina, magnesia, fused quartz, talc, and raw kaolin as inorganic main materials, and adds methyl cellulose, bromobenzene flame retardant, organosilicon polyether copolymer, soybean oil And water as a catalyst, especially the addition of low-smoke, low-toxic bromobenzene flame retardant, is a functional additive that imparts flame retardancy to flammable polymers. It can provide flame retardancy of polymer materials and can effectively inhibit The organic matter in the honeycomb ceramic carrier burns, avoiding the temperature difference between the inside and outside of the carrier, and improving the firing pass rate; at the same time, the inhibitory effect of the flame retardant can make the honeycomb ceramic carrier heat up rapidly during the firing process, which helps to improve production efficiency, and has the advantages of energy saving and environmental protection. Advantage.

The invention discloses low-expansion high-strength thin-wall cordierite honeycomb ceramic and a preparation method thereof. Content of cordierite in ceramic is greater than 95%, and the ceramic is prepared from the following chemical components in percentage by mass: 47.5-52.5% of SiO2, 32.7-37.7% of Al2O3 and 11.5-15.5% of MgO; porosity of honeycomb ceramic is greater than or equal to 16%, and awater absorption rate is 14%-30%; bending strength of the honeycomb ceramic is greater than or equal to 1.6 MPa; and a thermal expansion coefficient at the room temperature of 800 DEG C is smaller than or equal to 5*10<-7> / DEG C. According to the preparation method, aluminum hydroxide prepared by a special preparation method is led, so that the product has low CTE (Coefficient of Thermal Expansion), high strength and low cost.