3results about How to "Short degreasing time" patented technology

The invention discloses a high-strength zirconia composite ceramic product and a preparation process thereof, and belongs to the technical field of ceramics. In the prior art, ceramics prepared from various inorganic materials such as zirconium oxide are easy to deform or crack in a hot press molding process; although the forming capacity of the powder can be improved by adding the binder, the technical problem that the strength of the ceramic product added with the binder and degreased is reduced exists. A preparation process of a high-strength zirconium oxide composite ceramic product comprises the following steps: mixing zirconium oxide, silicon nitride, zirconium boride and carbon nanotubes, and carrying out wet ball milling to obtain composite ceramic powder; mixing the composite ceramic powder and the binder mixture to obtain feed; carrying out pressure forming, degreasing and sintering on the feed to obtain a ceramic green body; the ceramic green body is subjected to metal ion injection and surface coating to obtain the high-strength zirconium oxide composite ceramic product. The prepared composite ceramic product is stable in forming structure and high in strength.

The invention discloses an atmosphere sintering furnace and a degreasing sintering method, and relates to the technical field of sintering equipment. The atmosphere sintering furnace comprises a furnace body, a negative pressure device, a blower device and an oxygen circulation system; a first air outlet of the furnace body is connected and communicated with an air inlet of the negative pressure device, and a first air inlet of the furnace body is connected and communicated with an air outlet of the blower device; the oxygen circulating system comprises an oxygen cooling device, an oxygen purifying device, a pressurizing device and a pure oxygen storage tank which are connected and communicated in sequence; a second gas outlet of the furnace body is connected and communicated with a gas inlet of the oxygen cooling device, and the second gas outlet of the furnace body is connected and communicated with a gas outlet of the pure oxygen storage tank; electric control valves are arranged in all the air outlets and all the air inlets, and all the electric control valves are connected with the control system in an electric control mode. During degreasing, the inside of the furnace is pumped to set negative pressure, exhaust of waste gas generated by a binder in a blank is accelerated through cooperation with the blower device, oxygen circulation is achieved during sintering, and oxygen waste is avoided.

The application discloses a high-performance aluminum nitride ceramic rapid sintering method and belongs to the technical field of ceramic materials, and comprises the following steps: preparing ceramic raw materials according to a formula: uniformly mixing high-purity aluminum nitride powder, a sintering aid, a hydrolysis-resistant agent and a solvent, and drying under a nitrogen atmosphere; the ratio of the high-purity aluminum nitride powder, the sintering aid and the hydrolysis-resistant agent is 1:1%-3%:0.5%-1.5%; primary sintering of the ceramic: heat-press sintering the uniformly mixed aluminum nitride powder under a neutral or reducing atmosphere at 1650-1850 DEG C and a pressure of 20-30 MPa for 10-60 min, so that the density of the aluminum nitride powder reaches more than 99%; secondary sintering of the ceramic: sintering the primary-sintered aluminum nitride ceramic under a reducing atmosphere at 1850-2000 DEG C under normal pressure for 1-6 h. The prepared aluminum nitride ceramic not only has high heat conduction performance, but also has high sintering efficiency; meanwhile, the problem of waste gas generated in the degreasing process is avoided, and the environment is protected.