32results about How to "Avoid running out quickly" patented technology

The invention discloses a method for carburizing the surface of cemented carbide, which is characterized in that it first heats the temperature at 550-700°C for 1-2 hours to form a cemented carbide blank containing carbide-forming elements; 2 o 3 coated TiH 2 Core / shell structure powder with thickness less than 3nm, number of layers less than 3 and specific surface area greater than 250m 2 / g of graphene and two substances are mixed according to the weight percentage of 2:3 to prepare a hydrogen-containing carburizing medium; then the green body is embedded in the hydrogen-containing carburizing medium and compacted under a pressure of 5~15MPa; finally, the liquid phase Sintering to realize carburizing of cemented carbide surface. The invention overcomes the problems of severe crystal grain growth, long carburizing time and low efficiency in the prior art, and realizes carburizing of the hard alloy surface in the sintering process.

The invention discloses a method for preparing surface carburized gradient cemented carbide, which is characterized in that it first heats the temperature at 550-750°C for 2-4 hours to form a cemented carbide product with a porosity of 25%-40% and removes the forming agent. blank; then SiO2-coated TiH2 core / shell structure powder, graphene with a thickness of less than 3nm, a number of layers less than 3 layers and a specific surface area greater than 250m2 / g, and BaCO3 are prepared by mixing 1:2:1 by weight percentage Hydrogen-containing carburizing medium; then the green body is buried in the hydrogen-containing carburizing medium and compacted under a pressure of 5-15MPa; finally, liquid-phase sintering is carried out to prepare a surface-carburized gradient cemented carbide. The invention overcomes the problems of serious grain growth, long carburizing time and low efficiency in the prior art, and prepares surface carburized gradient hard alloy in the sintering process.

The invention discloses a preparation method of a gradient cemented carbide with a graphite-rich surface, which is characterized in that it first heats the cemented carbide at 550-750°C for 2-4 hours to form a cemented carbide with a porosity of 25%-40%. Green body; then amorphous Si-C-O-coated TiH2 core / shell structure powder, multi-walled carbon nanotubes with outer diameter less than 8nm, length less than 30μm and specific surface area greater than 350m2 / g, Na2CO3 three kinds of substances by weight The ratio of 1:2:1 is mixed to prepare a hydrogen-containing carburizing medium; then the green body is embedded in the hydrogen-containing carburizing medium and compacted under a pressure of 5~15MPa; finally, liquid phase sintering is carried out to prepare a surface graphite-rich phase gradient cemented carbide. The invention overcomes the problems of severe grain growth, long carburizing time and low efficiency in the prior art, and prepares gradient hard alloy with graphite-rich phase on the surface during the sintering process.

The invention discloses a preparation method of metal ceramic wear resistant material based on carbide forming elements promoting carbon migration. The method is characterized by comprising the following steps: firstly performing heat preservation for 1 to 2 h at 500 to 700 DEG C, so as to form a metal ceramic body containing the carbide forming elements; then mixing core / shell structure powder of Al2O3 coated TiH2, graphene with the thickness being smaller than 3 nm, the number of layers being smaller than 3 and the specific surface area being greater than 250 m<2> / g, and Na2CO3 according to a weight percentage of 3:2:1, so as to prepare a hydrogen-containing carburizing medium; embedding the metal ceramic body into the hydrogen-containing carburizing medium, and performing compaction at 5 to 15 MPa; and finally performing liquid-phase sintering, so as to prepare the metal ceramic wear resistant material based on the carbide forming elements promoting carbon migration. The method overcomes the problems of serious crystal grain growth, long carburizing time and low efficiency in the prior art, and realizes the preparation of the metal ceramic wear resistant material during a sintering process.

The invention discloses an in-situ preparation method of surface carburized hard alloy, which is characterized in that it first heats the temperature at 550-700°C for 1-2 hours to form a hard alloy body containing carbide-forming elements; then wraps Al2O3 TiH2-coated core / shell structure powder, multi-walled carbon nanotubes with an outer diameter of less than 8nm, a length of less than 30μm and a specific surface area greater than 350m2 / g, and BaCO3 are mixed at a weight percentage of 2:3:1 to prepare hydrogen-containing carburizing medium; then embed the green body in a hydrogen-containing carburizing medium and compact it under a pressure of 5-15 MPa; finally, carry out liquid phase sintering to prepare a surface carburized cemented carbide. The invention overcomes the problems of serious crystal grain growth, long carburizing time and low efficiency in the existing technology, and realizes in-situ preparation of surface carburized hard alloy in the sintering process.

The invention discloses a preparation method of self-lubricating surface Ti (C, N)-based metal ceramic based on a metal hydride. The method is characterized by comprising the following steps: firstly performing heat preservation for 1 to 2 h at 500 to 700 DEG C, so as to form a metal ceramic body containing carbide forming elements; and then mixing core / shell structure powder of Al2O3 coated TiH2, a multiwalled carbon nanotube with the external diameter being smaller than 8 nm, the length being smaller than 30 micrometers and the specific surface area being greater than 350 m<2> / g, and NaHCO3 according to a weight percentage of 3:2:1, so as to prepare a hydrogen-containing carburizing medium; embedding the metal ceramic body into the hydrogen-containing carburizing medium, and performing compaction at 5 to 15 MPa; and finally performing liquid-phase sintering, so as to prepare the self-lubricating surface Ti (C, N)-based metal ceramic. The method overcomes the problems of serious crystal grain growth, long carburizing time and low efficiency in the prior art, and realizes the preparation of the self-lubricating surface Ti (C, N)-based metal ceramic during a sintering process.

The invention discloses an in-situ preparation method of a hard alloy achieving surface self-lubrication. The in-situ preparation method of the hard alloy achieving surface self-lubrication is characterized in that forming-agent-free hard alloy green bodies with the porosity being 25%-40% are formed under the condition that the temperature of 550-750 DEG C is kept for 2-4 h; core / shell structure powder with Al2O3 covering TiH2 and nanometer graphite with the thickness granularity being 30-50 nm are mixed at the weight percentage ratio of 1:2 so as to prepare a carburizing medium containing hydrogen; the green bodies are embedded into the carburizing medium containing hydrogen and are compacted at the pressure of 5-15 MPa; and finally, liquid-phase sintering is conducted, and in-situ preparation of the hard alloy achieving surface self-lubrication is achieved based on carbon migration. The in-situ preparation method of the hard alloy achieving surface self-lubrication overcomes the problems that in the prior art, grains grow severely, the carburizing time is long and efficiency is low, and in-situ preparation of the hard alloy achieving surface self-lubrication is achieved in the sintering process.

The invention discloses a method for preparing cemented carbide with a graphite-rich surface, which is characterized in that it first heats at 550-700°C for 1-2 hours to form a cemented carbide body containing carbide-forming elements; then amorphous Si-C ‑O core / shell structure powder coated with TiH2, graphene with a thickness of less than 3nm, a layer number of less than 3 layers and a specific surface area greater than 250m2 / g, and NaHCO3 are mixed according to weight percentage 2:3:1 to prepare a hydrogen permeable carbon medium; then embed the green body in a hydrogen-containing carburizing medium and compact it under a pressure of 5-15MPa; finally carry out liquid phase sintering to prepare a cemented carbide with a graphite-rich surface. The invention overcomes the problems of serious crystal grain growth, long carburizing time and low efficiency in the existing technology, and realizes the preparation of hard alloy with graphite-rich surface in the sintering process.

The invention discloses a method and a system for heterogeneous memory allocation based on data object hot degree. The method comprises; performing instrumentation in source codes, counting reading-writing operation information of data objects included in the source codes; through performing cache filtering on the reading-writing operation information of the object, obtaining memory access characteristics of the data object, the memory access characteristics of the data object being characteristic of variation of reading-writing operation memory access frequency of the data object on heterogeneous memory with time; according to the memory access characteristics of the data object, determining memory access hot degree grade of the data object; according to the memory access hot degree grade of the data object, at least a piece of information of time delay energy consumption information and available capacity information of a dynamic random access memory, and time delay energy consumption information and available capacity information of a nonvolatile memory, distributing the data object to one of the dynamic random access memory and the nonvolatile memory. In the method, an object is used as a minimum granularity, resource waste on memory bandwidth can be reduced, and availability of the memory is considered, and performance of the system is ensured.

The invention provides a downhole oil-water interface detector which comprises a detection sensor D and a ground detector M. A plurality of detection structures are arranged on the detection sensor D, first ends of the multiple detection structures are electrically connected with one another, second ends of the multiple detection structures are connection contact points which are sequentially arranged along the height directions of the detection structures at intervals, and each detection structure comprises a detection resistor R; the ground detector M is connected with the detection sensor D, measurement voltages Vc can be outputted to the detection sensor D by the ground detector M, and measurement currents Ic which flow through the detection sensor D can be detected by the ground detector M, so that the heights of oil-water interfaces can be judged according to the measurement currents Ic. The downhole oil-water interface detector has the advantage that detection effects can be improved by the downhole oil-water interface detector.