141results about How to "Porosity adjustable" patented technology

A gas diffusion electrode and method of making the same. According to one embodiment, the electrode comprises a support layer, a first cushioning layer positioned on top of the support layer, a second cushioning layer positioned on top of the first cushioning layer, and a catalyst layer positioned on top of the second cushioning layer. The support layer is a mechanically stable, electrically-conductive, gas porous substrate, such as carbon fiber paper. The first cushioning layer, which is also gas porous, comprises a non-woven mat of electrically-conductive, chemically-inert fibers, preferably carbon nanofibers, bound together with a polymeric binder, such as polytetrafluoroethylene. The second cushioning layer is similar to the first cushioning layer, except that carbon black or a similar electrically-conductive, chemically-inert particulate material is included in addition to or instead of the fibrous material for the purpose of fine-tuning pore size.

There are provided a composite including a metal component supported on graphene, a preparing method of the same, and uses of the same. The composite may be used for removing a contaminant.

The present invention provides sintered polymeric materials and methods of making the same which are useful in a variety of applications. In one embodiment, the present invention provides a sintered polymeric material comprising at least one plastic and at least one elastomer.

The invention discloses a degradable open porous magnesium and magnesium alloy biomaterial and a preparation method thereof. The magnesium and magnesium alloy biomaterial is in a completely open structure, the hole shape and size are controllable, holes are communicated by virtue of communicating holes, and the number and size of the communicating holes in hole walls are controllable; the holes are uniformly distributed and the porosity is adjustable. The preparation method comprises the following steps: sintering sodium chloride crystal particles to obtain an open porous sodium chloride prefabricated structure; pouring molten magnesium or magnesium alloy into a mould cavity with a sodium chloride prefabricated body, and performing seepage pressure casting; and removing magnesium or magnesium alloy block outer skin with the sodium chloride prefabricated body, washing with alkali, and filtering to remove sodium chloride to obtain the degradable open porous magnesium and magnesium alloy biomaterial. The preparation process is simple, convenient to perform and pollution-free; the prepared open porous structure is provided with the communicated and uniformly distributed holes, is controllable in hole shape and size, relatively high in porosity and strength, free of pore former residues and pore closing phenomenon and adjustable in degradation rate, and can serve as a new-generation degradable bone tissue engineering scaffold.

The present invention is directed to protocells for specific targeting of hepatocellular and other cancer cells which comprise a nanoporous silica core with a supported lipid bilayer; at least one agent which facilitates cancer cell death (such as a traditional small molecule, a macromolecular cargo (e.g. siRNA or a protein toxin such as ricin toxin A-chain or diphtheria toxin A-chain) and / or a histone-packaged plasmid DNA disposed within the nanoporous silica core (preferably supercoiled in order to more efficiently package the DNA into protocells) which is optionally modified with a nuclear localization sequence to assist in localizing protocells within the nucleus of the cancer cell and the ability to express peptides involved in therapy (apoptosis / cell death) of the cancer cell or as a reporter, a targeting peptide which targets cancer cells in tissue to be treated such that binding of the protocell to the targeted cells is specific and enhanced and a fusogenic peptide that promotes endosomal escape of protocells and encapsulated DNA. Protocells according to the present invention may be used to treat cancer, especially including hepatocellular (liver) cancer using novel binding peptides (c-MET peptides) which selectively bind to hepatocellular tissue or to function in diagnosis of cancer, including cancer treatment and drug discovery.

The invention relates to a porous conductive ceramics, in particular to a porous conductive MAX phase (Ti3SiC2, Ti3AlC2 or Ti2AlC) ceramics with a through hole structure, and a preparation method and a use thereof. The porosity of the porous ceramics is adjustable within the range of 20-65%, the ceramics comprises a through hole structure, and the openporosity is more than 85%. The preparation method comprises the steps of taking MAX phase ceramic powder as a raw material, molding, carrying out pressureless sintering in an atmosphere furnace, keeping the sintering temperature at 1200-1400 DEG C, and leading the sintering time to be 0.5-3 hours. The MAX phase conductive ceramics with the through hole structure prepared by the pressureless sintering method can be used as a catalyst carrier material for automobile exhaust purification. The invention can solve the problems of liquid phase, a large number of closed pores in the generated hole and the like during the sintering process by optimizing the molding pressure, the sintering temperature and the time precise control of the porosity.

The invention discloses a method for preparing a porous polymer micro needle by using a template method and an application thereof. The method comprises the following steps of: (1) dissolving a polymer and a template agent in a solvent to prepare a polymer solution; (2) filling the polymer solution into a micro needle mould; (3) removing the solvent in the obtained micro needle mould to obtain a solid micro needle; (4) removing the template agent in the obtained solid micro needle to obtain the porous polymer micro needle. By improving the overall process flow design of the preparation method,the method can solve the technical problems of a complex preparation process, harsh conditions, a complicated process, high price, difficult control of the pore structure and size, difficult large-scale production and application and the like of the porous polymer micro needle, the obtained porous polymer micro needle can be used for tissue fluid extraction and transdermal administration, such asskin tissue fluid and blood extraction and transdermal administration of proteins, polypeptides and small molecular drugs in cosmetic, hair growth, immunity, treatment and other applications.

The present invention provides sintered polymeric materials and methods of making the same which are useful in a variety of applications. In one embodiment, the present invention provides a sintered polymeric material comprising at least one plastic and at least one elastomer.

The invention discloses a degradable open-cell porous zinc / zinc alloy biomaterial and a preparation method thereof. The degradable open-cell porous zinc / zinc alloy biomaterial is of a completely open-cell structure, wherein the hole pattern and the size are controllable, holes are communicated by use of communicating holes, and the number and the size of the communicating holes in the hole walls are controllable; the biomaterial is even in overall hole distribution and adjustable in porosity. The preparation method of the biomaterial comprises the following steps that sodium chloride crystal particles are sintered to obtain an open-cell porous sodium chloride prefabricated structure; a zinc or zinc alloy melt is poured into a die cavity in which a sodium chloride prefabricated body is put and pressure seepage casting is performed; the outer skin of a zinc or zinc alloy block containing the sodium chloride prefabricated body is removed, and then alkali wash is performed and the sodium chloride is performed to obtain the degradable open-cell porous zinc / zinc alloy biomaterial. The preparation method of the degradable open-cell porous zinc / zinc alloy biomaterial is simple in process, convenient to operate and pollution-free; the obtained open-cell porous structure has the advantages that the holes are communicated with each other and distributed evenly, the appearance and size of the holes are controllable, the porosity and the strength are relatively high, no hole forming agent is left and hole closure is prevented, and meanwhile, the degradation rate is adjustable; as a result, the biomaterial can be used as a new generation degradable bone tissue engineering stent.

The invention discloses a 3D printing aramid fiber aerogel, and a preparation method and an application thereof. The preparation method comprises the following steps: uniformly mixing aramid nanofibers and a solvent to form an aramid nanofiber dispersion; and carrying out sol-gel conversion and drying treatment through a freezing-direct writing forming technology to obtain the 3D printing aramid fiber aerogel. Surface hydrophobic modification and filling modification are respectively carried out on the 3D printing aramid aerogel to respectively obtain a hydrophobic material, a photochromic material and a temperature response material. The preparation method of the 3D printing aramid fiber aerogel has the advantages of wide dispersity, low energy consumption, quick low-temperature response,high printing precision, simple process and short flow, and the obtained 3D aramid aerogel has the advantages of ultralow density, good mechanical properties and structural designability, can be applied to the fields of heat preservation and insulation, catalysis, separation / adsorption, sensing, soft robots and the like, and greatly expands the application range of 3D printing and aramid aerogel.

The invention belongs to an inorganic mesoporous material area, in particular to a preparation method of a controllable silica hollow sphere material in a certain diameter range. The anionic surfactant sodium dodecyl sulfonate (SDS) controls the synthesis of spherical wall, which is provided with mesoporous channels and narrow distribution of diameter. The invention uses block copolymer and sodium dodecyl sulfonate as mixing template; with the addition of silicon source, the sol is formed after mixing; under the acid condition, through the agitating and aging treatment, after hydrothermal process, filtering and drying, the template is calcined to obtain silica hollow sphere with the mesoporous channel. Through changing the content of SDS, the synthesis of different size of silica hollow spheres with the mesoporous channel can be controlled. The invention has a simple process and a low cost; the mesoporous shell thickness and the pore diameter of the prepared silica hollow sphere with the mesoporous channel can be controlled in a large range; the invention is beneficial to the internal and external transmission of guest molecules; the invention also improves the reserves of guest molecules, which realizes the controlled release effectively.

The invention relates to a method for improving the thermochromatic characteristic of a vanadium dioxide film, which is characterized by comprising the following steps of: preparing the vanadium dioxide film with a sculpture structure on a substrate by virtue of a vacuum glancing angle deposition technology; regulating and controlling the optical performance and the thermochromatic performance of the vanadium dioxide film by virtue of the porosity and the anisotropism of the sculpture structure; and then improving the crystalline characteristic of the vanadium dioxide film via later-stage heat treatment. The film prepared by the method can be widely applied to the fields of intelligent energy-saving windows, temperature-controlled switches, thermistors, optical storage, infrared protection and the like.

The invention belongs to the field of lithium ion battery diaphragm materials and discloses modified silicon dioxide and a lithium ion battery polyolefin microporous diaphragm. The diaphragm is prepared by the following method: blending modified silicon dioxide with polyolefin having high / ultrahigh molecular weight, adding common polyolefin, and pelleting so as to obtain modified masterbatch; mixing the modified masterbatch with polyolefin and then carrying out melt blending and extrusion so as to form a diaphragm with a hard elastic structure; and carrying out continuous tension on the diaphragm, and then carrying out heat shaping at the temperature of 100-150 DEG C so as to obtain the lithium ion battery polyolefin microporous diaphragm. According to the invention, the thickness of the lithium ion battery polyolefin microporous diaphragm is relatively low (less than 15mu m); the strength of the diaphragm is better (the longitudinal breaking strength is larger than 100MPa, the transversal breaking strength is about 8MPa, and breaking elongation is 50%); the porosity and pore structure of the diaphragm are adjustable (the porosity is more than 50%, and the pore diameter is 0.1-1mum); and the thermal shrinkage factor of the diaphragm is smaller (less than 5%). According to the invention, the defect and lack of the existing dry preparation technology of the lithium ion battery diaphragm are overcome.

The invention relates to a preparation technology of an artificial bone repairing material in the fields of an inorganic nonmetallic material and a biomedical material, and particularly relates to a three-dimensional ordered porous bracket material of chitosan fiber / bioactive glass and a preparation method of the three-dimensional ordered porous bracket material. The porous bracket material is composite bioactive glass at the surface of a chitosan fiber; the aperture is 80-500mu m; adhesive proliferation of a human bone cell is facilitated; and rapid forming of a new bone is facilitated. The preparation method comprises the steps of: coating mixed pulp of the bioactive glass on chitosan fiber cloth which is reinforced by puncture by a sol-gel dip-coating method, drying and repeating for 0-3 times. The three-dimensional ordered porous bracket material has the advantages of good biological activity, biocompatibility, biological degradability and the like, has obvious mechanical strength and good mechanical property, and can meet the demands of providing stress support to a bone repair part.

The invention relates to a method for preparing nano-porous silicon from Cu nano-particles by two-step auxiliary etching and belongs to the technical field of preparation of nano-materials. The method comprises the following steps: firstly, pre-treating a silicon chip; performing surface oxidation treatment on the pre-treated silicon chip by using a physical or chemical method to form an oxidation layer; preparing a deposition solution and an etching solution; placing the silicon chip with the oxidation layer in the deposition solution for chemical deposition, taking out the silicon chip, placing the silicon chip in the etching solution, completely etching the silicon chip, then soaking the silicon chip into nitric acid, washing the silicon chip by using a great amount of deionized water, and then blow-drying the silicon chip by nitrogen to obtain the nano-porous silicon. The method offers a great help to the improvement of the surface area and the reaction activity of the nano-porous silicon, the surface reflectivity of the nano-porous silicon is greatly reduced, and the method has broad application prospect in the fields of nano-sensors and nano-catalysis.

The invention relates to the technical field of biomaterials, and particularly relates to a bone repair regeneration material and a preparation method thereof. The bone repair regeneration material comprises poly-DL-lactic acid, a calcium phosphate composition and collagen, wherein the calcium phosphate composition comprises hydroxyapatite and beta-tricalcium phosphate. According to the bone repair regeneration material and the preparation method thereof, the poly-DL-lactic acid, the hydroxyapatite-beta-tricalcium phosphate and the collagen are applied to construct the poly-DL-lactic acid / hydroxyapatite-beta-tricalcium phosphate / collagen bone repair regeneration material. The phase size is small and the uniformity is high in a preparation process, so that the prepared material has uniform distribution of material composition, has good biological function and mechanical properties, and provides a three-dimensional adhesion and growth space. The method is simple and safe, low in economic cost and adjustable in pore size and porosity, and the degradation rate of a scaffold can be controlled in a wide range. The bone repair regeneration material is used as a bone tissue engineering scaffold material, and is applied in repair of different kinds of bone tissue defects.

The invention relates to a polyurethane foam air-purification filter screen and a preparation method thereof. Polyurethane foam air-purification filter screen with simple synthetic process, firm loading, large specific surface area and high purifying efficiency and the preparation method thereof do not exist in the market at present. The polyurethane foam air-purification filter screen provided by the invention comprises air-purification material powder and is characterized by further comprising polyurethane foam, wherein the air-purification material powder is uniformly fixed in the polyurethane foam. The preparation method provided by the invention comprises the following steps: mixing material A, material B and the air-purification material powder, and then quickly and uniformly stirring and waiting for foaming; at the beginning of foaming trend, putting into a mold, foaming and forming; curing for 3-48 hours, thereby acquiring the polyurethane foam air-purification filter screen with the air-purification material powder uniformly distributed in the polyurethane foam, wherein the material A is used for preparing the polyurethane foam and the material B is polyisocyanate. The polyurethane foam air-purification filter screen has the advantages of simple synthetic process, firm load, large specific surface area, high purification efficiency and small wind resistance.

The invention discloses a preparation method of a porous alumina ceramic plate. The preparation method comprises following steps: 1, a slurry is prepared, wherein alumina powder, a sintering aid, a solvent, a dispersant, a plasticizer, and a binder are subjected to ball milling, and are mixed uniformly so as to obtain a slurry; 2, tape casting is carried out, wherein the slurry obtained in step 1is subjected to vacuum stirring defoaming, and is subjected to tape casting so as to obtain a ceramic blank; and 3, sintering is carried out, wherein the ceramic blank obtained in step 2 is subjectedto drying, thermal insulation degumming, sintering, and cooling so as to obtain the porous alumina ceramic plate. The porous alumina ceramic plate is low in preparation cost, high in porosity, and smooth in surface.

The invention discloses a porous carbon preform for reactive sintering, as well as a preparation method and application thereof. The porous carbon preform is obtained by taking charcoal powder as a carbon source, taking lignocellulose as a pore-forming agent, taking a modified polyester type high molecular compound as a dispersant, taking camphene as a dispersion medium, adding a certain amount of ethyl ether, performing constant-temperature ball milling at the temperature of 55 DEG C to obtain material slurry, performing vacuum degassing, then pouring and forming the material slurry at room temperature, subliming till constant weight, and carrying out biscuit firing at the temperature of 900-1550 DEG C for 0.5-2h. The porous carbon preform prepared by the method disclosed by the invention has the advantages of controllable density and porosity, uniform pore structure, no defects and the like, and has great reactive sintering performance; reaction sintered silicon carbide generated by high-temperature silicon impregnation reaction has no black cores, cracking, delamination and other defects, and has good mechanical properties.

The invention discloses a zirconium-based MOF material-based zirconium oxide-coated lithium-rich ternary positive electrode material and a preparation method thereof. The method comprises the following steps: firstly, synthesizing a lithium ion battery ternary positive electrode material with a spherical structure by adopting a carbonate precipitation method; secondly, coating and growing a layerof zirconium-based MOF material with a large specific surface area and a high porosity on the surface of the lithium ion battery ternary positive electrode material, carrying out high-temperature sintering on the material, removing organic components in the zirconium-based MOF material, and forming a zirconium oxide coating layer with a large specific surface area and a high porosity. Compared thezirconium oxide coating layer with a common zirconium oxide particle coating layer, a small amount of porous carbon structures formed in the decomposition process of the MOF material form a bridgingeffect among zirconium oxide particles, and an electron transfer channel is formed. Therefore, the phenomenon that zirconium oxide does not have electrochemical activity to cause the gram volume lossof the material can be relieved. Meanwhile, the structure of the composite material can be stabilized, and side reactions between active substances and an electrolyte are effectively reduced. The cycle performance of the ternary positive electrode material of the lithium ion battery is effectively improved.

The present invention is directed to protocells for specific targeting of hepatocellular and other cancer cells which comprise a nanoporous silica core with a supported lipid bilayer; at least one agent which facilitates cancer cell death (such as a traditional small molecule, a macromolecular cargo (e.g. siRNA or a protein toxin such as ricin toxin A-chain or diphtheria toxin A-chain) and / or a histone-packaged plasmid DNA disposed within the nanoporous silica core (preferably supercoiled in order to more efficiently package the DNA into protocells) which is optionally modified with a nuclear localization sequence to assist in localizing protocells within the nucleus of the cancer cell and the ability to express peptides involved in therapy (apoptosis / cell death) of the cancer cell or as a reporter, a targeting peptide which targets cancer cells in tissue to be treated such that binding of the protocell to the targeted cells is specific and enhanced and a fusogenic peptide that promotes endosomal escape of protocells and encapsulated DNA. Protocells according to the present invention may be used to treat cancer, especially including hepatocellular (liver) cancer using novel binding peptides (c-MET peptides) which selectively bind to hepatocellular tissue or to function in diagnosis of cancer, including cancer treatment and drug discovery.

The invention discloses a method for preparing a hydroxyapatite crystal whisker porous ceramic support mainly used for bone repair and belongs to the field of biomedical materials. According to the method, hydroxyapatite crystal whisker is used as the raw material, potassium laurate is used as a foaming agent, carboxymethylcellulose is used as a foam stabilizer, a ceramic foam body is obtained through stir-foaming, a ceramic blank is obtained through extrusion forming and freeze drying, and then the hydroxyapatite crystal whisker porous ceramic support is obtained through sintering. The porous ceramic material prepared with the method has honeycomb straight-through holes with diameters of 10-1000 microns and side wall holes with diameters of 1-400 microns. The method has the advantages that processes are simple and controllable, raw material cost is low, and production period is short. The modified hydroxyapatite crystal whisker porous ceramic support prepared with the method has qualified cytotoxicity, high degradation property and certain biological activity. Therefore, industrial production and clinical application can be achieved.

The invention discloses a method for preparing high-strength boron carbide porous ceramics. The method comprises the following steps: (1) proportioning raw materials: 80-95wt% of boron carbide powder,0-3.0wt% of suspending agent, 3-15wt% of binder, 5-12wt% of sintering assistant and 0-12wt% of lubricant; (2) adding distilled water into the raw materials, and carrying out mixing in a ball mill orstirring mill, so as to obtain boron carbide slurry, wherein boron carbide granules 1# and boron carbide granules 2# in the boron carbide slurry are uniformly distributed and suspended; (3) subjectingthe boron carbide slurry to spraying granulation, and carrying out drying, so as to obtain boron carbide powder with fluidity; (4) molding the boron carbide powder, so as to obtain boron carbide biscuits; and (5) placing the boron carbide biscuits into a vacuum or atmosphere no-pressure sintering furnace. According to the method, the weak points that the quantity of sealed pores is large, a ceramic matrix is complicated in ingredient, the strength is low, and the like can be overcome, and boron carbide can have more extensive application.

The invention discloses a strontium and iron doped hydroxyapatite collagen fiber composite scaffold material and a preparation method thereof. The scaffold material is prepared through compounding collagen fibers having a three dimensional connective porous structure with strontium and iron doped hydroxyapatite with a good drug therapy function. The preparation method mainly comprises the following steps: preparing strontium and iron doped hydroxyapatite through a co-precipitation technology; and compounding the collagen fibers through a dipping-pulling technology. The functional bone restoration scaffold material has excellent biologic performances, very good mechanical strength and toughness and a three dimensional connective macro-porous structure, can deliver drugs to a specific position under the induction of a magnetic field, can restore and treat bone defects induced by various bone diseases, and has wide application prospect in the field of bone restoration materials and biological drugs.

The invention belongs to the technical field of preparation of curing agents, and discloses an epoxy resin water-permeable material curing agent and a preparation method and application thereof. The curing agent is prepared from the following components in percentage by mass: 50-80 percent of ricinoleic acid and / or a polymer thereof, and 20-50 percent of fatty polyamine, alicyclic polyamine or polyoxypropylene polyamine containing a polypropylene oxide chain segment. The curing agent provided by the invention is a waterborne curing agent, has superior curing performance, and can be cured at the room temperature; a cured product has superior water permeability and air permeability, and can be applied to curing of an epoxy water-permeable material to prepare an epoxy ceramic forming mold or an epoxy water-permeable material. A fatty polyamine, polyoxypropylene polyamine or alicyclic polyamine curing agent is modified, so that the curing agent contains hydrophobic long-chain alkyl, hydrophilic hydroxyl, an amino group, acylamino and an ester group, has self-emulsifying performance, and can also be taken as a curing agent; a gap and a channel are formed between the epoxy resin and inorganic filler through a hydrophobic group, so that the obtained epoxy material has superior water permeability and air permeability.

The invention relates to a degradable hollow fiber membrane and application thereof. The degradable hollow fiber membrane comprises polybutylene carbonate (PBC) as a completely biodegradable material, wherein the PBC has a molecular weight is 0.01-0.25 million. The degradable hollow fiber membrane is applied to tissue engineering as an artificial blood vessel repair material and a catheter stent material. A preparation method of the degradable hollow fiber membrane is simple, and can be used for preparing degradable hollow fiber membranes with different internal diameters, wall thicknesses, lengths and porosity in batches; and the degradable hollow fiber membrane has better mechanical property, is suitable for cell growth, has shorter degradation period, and also has better application prospect in the field of biological application.

Compositions and methods are described for a temporary adhesive used to affix a work unit onto a carrier substrate whereby its porosity is tuned by choosing and adjusting the polymeric resin and filler components to provide sufficient adhesion to support a manufacturing process, and upon completion, there is advanced penetration of a liquid into the interfacial bond causing release of the work unit without harm. The temporary adhesive provides a tunable porosity that is dependent upon the mathematical calculation of the weight basis ratio of filler to binder, that is preferably greater than 0.4, more preferably greater than 1.0, and most preferably greater than 2.0. The temporary adhesive may be applied and cured in a variety of ways that meet the needs of the form of the work unit and objectives of the manufacturing process. The invention provides benefits of flexibility and reduced cost when establishing practices to handle difficult work units in the manufacture of semiconductors and flat panel displays.

The invention relates to an injectable silk fibroin porous hydrogel and a preparation method thereof, and belongs to the technical field of organic high-molecular polymer materials. The preparation method of the injectable silk fibroin porous hydrogel comprises the following steps: preparing a silk fibroin aqueous solution; performing concentration on the silk fibroin aqueous solution to obtain asilk fibroin concentrate; performing stirring shearing on the silk fibroin concentrate to make the concentrate pre-crosslinked to obtain silk fibroin fluid foam; and injecting the silk fibroin fluid foam into a mold, and allowing the mold to stand to obtain the injectable silk fibroin porous hydrogel. The preparation method provided by the invention simulates a molding process of natural silk without adding any cross-linking agents, and the operation is simple; the prepared hydrogel can fill the defect of any shapes, meet complex shapes of different wounds, and reduce invasiveness of an implant to body tissues; and before the hydrogel is injected, the hydrogel can be compounded with special-effects drugs and biologically-active substances through a mixing manner to construct a hydrogel drug sustained-release system.

The invention provides a particulate material comprising porous polymeric microparticles having a mesoporous structure. A process for making the particles is also presented. The process comprises impregnating a porous microparticulate template material with a liquid comprising one or more monomers. The one or more monomers are then polymerised in and / or on the template material to form a polymer, and the template material is then removed to produce the particulate material.

The invention discloses a ceramic and metal composite binding agent, a preparation method and a diamond grinding wheel. The binding agent is composed of, by weight, 35-40 parts of SiO2, 25-30 parts of H3BO3, 10-15 parts of Li2B4O7, 3-10 parts of AlF3, 2-6 parts of Na2S, 2-5 parts of Fe2N, 3-8 parts of Mg3N2, 2-6 parts of CaF2 and 15-20 parts of lead-tin alloy or nickel-titanium alloy. The binding agent not only has the advantages that the degree of fire resistance is low (as low as 650 DEG C), the thermal expansion coefficient is small (3.0-4.0*10-6 / DEG C), the strength is high (the bending strength reaches 150-220 Mpa), the porosity is adjustable, the self-sharpening performance is good and the chemical stability is good, but also has the excellent properties of high heat conductivity (20-50 W / m.K) and good toughness, is suitable for molding of the diamond grinding wheel, and better meets the requirements of modern precision grinding machining.