38results about How to "Low detonation velocity" patented technology

The invention discloses an explosive welding method for bimetal composite boards with special quality requirements. The explosive welding method includes preprocessing blanks; charging powder; and performing explosive welding. In a powder charging procedure, 'basin'-shaped powder charge bodies are arranged on shroud plates and extension plates, upper and lower surfaces of the powder charge bodies are parallel to the shroud plates and the extension plates, and powder charging quantities are acquired by computing according to a formula. The welded rate of the composite boards welded by the explosive welding method reaches 100%, the bonding strength of welded surfaces of the bimetal composite boards meet a bimetal solid-phase metallurgical bonding strength law, bonding interfaces of the bimetal composite boards are finely wavy and are excellent in quality, and accordingly the quality requirements of critical equipment of thermonuclear fusion power generation test reactors on the composite boards are met.

The invention discloses a high-density low-detonation velocity explosive. The explosive consists of the following components in parts by weight: 14-16 parts of cyclonite, 64-66 parts of barium nitrate, 15-16 parts of binder, 4-5 parts of plasticizer and 0.5-0.7 part of curing agent; and grain composition is carried out on the cyclonite, so that density uniformity is improved. The invention further discloses a preparation method for the explosive, wherein the preparation method comprises four steps of preparing materials, mixing, treating in vacuum, casting, heating and curing. The explosive disclosed by the invention has higher density, lower detonation velocity, and has good adaptation to environments such as temperature impact, high temperature, high pressure, and the like.

The invention discloses an explosive welding method of a metal clad plate of a super-thick shroud plate. The explosive welding method comprises the following steps of 1) pretreating substrate and shroud plate blanks; 2) arranging an extension plate at the periphery of the shroud plate; 3) arranging a substrate and the shroud plate; 4) laying main charge and auxiliary charge; 5) producing and arranging a priming device; 6) carrying out explosive welding. According to the explosive welding method, the welded rate of the clad plate welded through the process reaches 100%, the bonding strength of a welding surface conforms to a strength rule of duplex metal solid phase metallurgical bonding, a bonding interface of the welding surface is in a shape like a micro-wave with excellent quality, the impurity content of the interface is not higher than the corresponding impurity content of raw materials, and the welding quality requirements on the clad plate are completely met.

The invention discloses a liquid explosive with a small critical diameter and medium detonation velocity and a preparation technology thereof. The liquid explosive is composed of the following components in percentage by weight: 60 to 90% of nitromethane, 3 to 10% of sensitizing agent, 5 to 20% of performance buffering agent, and 2 to 10% of complexing agent. The liquid explosive has the following characteristics: (1) the mechanical sensitiveness is low, and the operation is safe; (2) the detonation is reliable, the critical diameter is small, and the energy is proper; (3) the fluidity is good, and thus the liquid explosive is suitable for long distance pumping; (4) the whole system is in a weak alkali state and is non-corrosive to metals; (5) the preparation method is simple, the price is low, and the liquid explosive can be mixed onsite before using. The liquid explosive is applied to oil and gas exploitation and is especially suitable for oil and gas exploitation in low permeable hard rock areas.

An explosive formulation used in blasting operations such as, but not limited to, mining operations and the like. The formulation is composed of a modified form of Ammonium Nitrate Fuel Oil (ANFO) explosives which have been modified by the incorporation of a solid fuel material. The formulation comprising a dry granular solid component, a liquid high-boiling point component of about 4% by weight, and a solid fuel material. The solid fuel material comprising vitrinite macerals, liptinite macerals, and inert macerals fusinite and semifusinite, and is characterized as (1) having a concentrate of liptinite that is higher than normal coals, and (2) having a concentrate of pseudovitrinite that is significantly lower than normal coals.

The invention belongs to the technical field of explosive welding, and provides an explosive welding method for a large-size metal composite plate. The explosive welding method comprises the following steps that a base plate and a composite plate are sequentially subjected to mechanical shock treatment, heating treatment and installation to obtain a composite plate; after a detonating cord is fixed in the length direction of the composite plate, explosive is laid on the composite plate; and the composite plate is subjected to explosive welding with the middle position of the detonating cord as a detonating point, and the large-size metal composite plate is obtained. The bonding rate of the large-size metal composite plate obtained through the method reaches 99.8% or above, cracks and boundary effects do not exist, the bonding strength of a welding face is high, and the layering and desoldering phenomena do not occur; and according to the method, an exhaust path can be reduced, the detonation velocity of the explosive can be reduced, the explosion time is prolonged, the explosion continuity is improved, and the phenomenon of explosion failure is avoided.

The invention discloses a low explosion speed high-toughness flake explosive which consists of the following components in parts by weight: 50-55 parts of a single-compound explosive, 20-25 parts of aspeed reduction filler, 9-14 parts of an adhesive, 3-6 parts of a plasticizer, 2-4 parts of a toughening agent, 1-1.5 parts of a curing agent, 3-5 parts of a dispersant and 0.4-0.6 part of a couplingagent. The invention further discloses a method for preparing the low explosion speed high-toughness flake explosive. Due to adoption of silica as the speed reduction filler, the explosion speed of the formula can be reduced; due to adoption of CAB (Cellulose Acetate Butyrate) as the toughening agent, the toughness of the formula can be improved; due to a reasonable ratio of solid phases to liquid phases, the formula can be easily formed as flakes.

The invention discloses a composite explosive and making method of stainless steel composite steel board, which comprises the following parts: 95% ammonium nitrate, 4-6% composite oil and 3-10% water-increasing pearlite. The making method of composite explosive comprises the following steps: I, bulking 95% ammonium nitrate; II. adding ammonium nitrate in the 4-6% composite oil; IV. adding 3-10% water-increasing pearlite in the ammonium nitrate; V. stirring evenly; VI. drying.

The invention relates to a low-detonation-velocity explosive for explosive welding and a preparation technique thereof. The low-detonation-velocity explosive for explosive welding is mainly prepared from 60-83 wt% of third-grade coal mine allowable powder emulsion explosive, 10-25 wt% of talcum powder, 5-10 wt% of silicon aluminum powder and 3-5 wt% of wheat straw powder. The preparation technique comprises the following steps: respectively weighing the following raw materials in percentage by mass: third-grade coal mine allowable powder emulsion explosive, talcum powder, silicon aluminum powder and wheat straw powder; and drying the talcum powder, silicon aluminum powder and wheat straw powder at 80-95 DEG C until the water content is not higher than 0.5 wt%, uniformly mixing, adding the wheat straw powder to obtain the low-detonation-velocity explosive for explosive welding, and packaging for later use. The low-detonation-velocity explosive for explosive welding is easy to produce, and has the advantage of stable performance. The low-detonation-velocity explosive for explosive welding satisfies the requirement that the explosive welding explosive brisance is 9-11mm, the detonation velocity is 2500-2750 m/s, thereby ensuring the explosive welding effect.

The invention provides a method for preparing an explosive composite rod in a local vacuum environment. The method comprises the following steps that a to-be-composited rod, a to-be-composited pipe and a pvc (polyvinyl chloride) pipe are coaxially arranged from inside to outside, and the space between the pvc pipe and the to-be-composited pipe is filled with explosive and a detonator to form an explosive device of a to-be-welded material; the two ends of the gap between the to-be-composited bar and the to-be-composited pipe are sealed and vacuumized by reasonably utilizing sealing strips, so that a vacuum gap environment is formed; and the explosive device is detonated, the to-be-composited pipe and the to-be-composited bar are welded and combined through high pressure generated by explosive explosion, and the high-quality explosive composite bar is obtained. Compared with a traditional explosive composite rod preparation method, the method for preparing the explosive composite rod in the local vacuum environment has the advantages that the explosive velocity selection is more free, and the operability is higher; and the bonding strength of the explosive composite rod is remarkably improved, and meanwhile the unavoidable phenomenon that in a traditional preparation method, large-area melting occurs on a composite rod bonding interface due to the fact that gap air is not exhausted in time is effectively eradicated.

The invention discloses a novel neon gas protection explosive welding method. The novel neon gas protection explosive welding method comprises the following steps that S1, cleaning is conducted, specifically, the to-be-combined surfaces of a base plate and a compound plate are cleaned up; S2, assembling is conducted, specifically, the base plate and the compound plate which are cleaned up in the step S1 are assembled according to the principle that the base plate is located on the lower portion, the compound plate is located on the upper portion, and the to-be-welded surfaces are opposite, and a gap support is placed between the base plate and the compound plate; S3, explosive and detonator distribution is conducted, specifically, an explosive and a detonator are distributed on the upper surface of the compound plate; S4, a welding closed space is prepared, specifically, the base plate and the compound plate which are assembled in the step S3 are sealed through an aluminum-plastic hot melt film, and an air exhaust/inflation port and a gas component/pressure detection port are reserved in the diagonal positions; S5, neon gas is inflated, specifically, air in the closed space in the step S4 is exhausted, and the neon gas is inflated; and S6, explosive welding is conducted, specifically, the explosive is detonated through the detonator, and explosive welding is conducted. The situation that metal jet flow reacts with atmospheric components, and consequently brittle products are generated can be effectively avoided and weakened, the interface bonding quality is improved, and the welding strength is improved.

The invention relates to a low explosion velocity explosive for explosive welding, which comprises the following components by weight percentage: 70-85 percent of No. 2 rock ammonium nitrate explosive, 10-25 percent of NaCl and 5-15 percent of water, and the components are uniformly mixed and prepared on the site. According to the low explosion velocity explosive, the explosion velocity of a common explosive is decreased, the use amount and the cost of a composite explosive for explosion are lowered; the low explosion velocity explosive overcomes the defects of over high explosion velocity and high probability of damaging the composite material low in the fusing point when the No. 2 rock ammonium nitrate explosive is directly used; explosives at different explosion velocities can be prepared according to different requirements of different materials on the explosion velocities on the site, and the technique is simple.

The invention realizes the welding of composite 3Cr13-Cu (Al)-1Cr18Ni9Ti for a lampblack free boiler through three key technologies of wadding formulation optimization, welding base design and double cladding surface protection by adopting a once-explosion welding method, thereby greatly lowering the cost, improving the bonding strength of the interface of the composite, and being capable of replacing the material imported from foreign countries.

The invention discloses a density moderating agent for powdery explosives for explosive cladding. The density moderating agent is prepared from one or more mutual compounds in parts by weight: 500 to950 parts of perlite, 10 to 400 parts of carbon powder, 50 to 300 parts of aluminum powder and 30 to 200 parts of talcum powder. Raw materials selected by the density moderating agent are hydrophobicsubstances, so that free-flowing property of the explosives can be effectively improved and humidity resistance performance of the explosives is greatly improved. The invention also discloses a preparation method of the density moderating agent for the powdery explosives for explosive cladding. The method comprises the following steps: putting one or more of the perlite, the carbon powder, the aluminum powder and the talcum powder into a mixing machine; turning on the mixing machine and performing mixing for 30 to 60 minutes to obtain a mixture, and then packaging the mixture into a bag. A technological method of the density moderating agent is simple; the density conditioning agent prepared by adopting the method is stable in quality, and can be used for modifying density and detonation velocity of ammonium nitrate fuel oil explosives and multi-pore-particle ammonium nitrate fuel oil explosives and regulating free-flowing property.

The invention relates to a preparation method of a low-detonation-velocity and low-density explosive applicable to nickel-steel compounding. The preparation method comprises the following steps: detecting detonation parameters of an emulsified explosive; if the detonation parameters accord with pre-set parameters, carrying out the following steps: adding the emulsified explosive and pearlite into an explosive mixing machine at the same time and uniformly stirring, wherein the weight ratio of the emulsified explosive to the pearlite is 58 to 38; adding bran into the explosive mixing machine and sufficiently and uniformly mixing, wherein the weight ratio of the emulsified explosive to the pearlite to the bran is 58 to 38 to 15; detecting the density and detonation velocity of a product in the explosive mixing machine; and considering the product with the density of 0.84g/cm<3> and the detonation velocity of 2000m/s-2200m/s as a qualified product. A nickel-steel compound plate obtained by detonation compounding of the explosive has the minimum shearing strength tau b which is more than or equal to 210Mpa; except a detonator shadow region, the fitting rate reaches 100%; and adverse effects on the detonator shadow region are eliminated through avoiding a useless part of a detonating point in the compound plate.

The invention provides a composite explosive particle and a preparation method thereof. The composite explosive particle is prepared from the following raw materials: CL-20, ADN, a composite surfactant, DOA and EVA, the composite surfactant is prepared from sodium taurodeoxycholate and nonylphenol polyoxyethylene ether. The composite explosive particle has the advantage of high energy, compared with CL-20, the detonation velocity of the insensitive composite particle is reduced by less than 5%, and the explosion heat and oxygen balance are remarkably improved. The composite explosive particle provided by the invention has the advantage of low sensitivity, and the mechanical sensitivity of the composite particle is obviously superior to that of the original CL-20 explosive and ADN explosive. The composite explosive particle is remarkable in heat effect, and the decomposition temperature is higher than that of the simple substance component ADN. According to the composite explosive particle, two sensitive high-energy explosives are adopted as matrixes to prepare the composite particle, and the safety of a composite material is guaranteed through a physical matching technology.

The invention relates to a medium-low detonation velocity liquid explosive and a preparation process thereof. The liquid explosive comprises the following components by mass: 45-88% of a liquid explosive, 1-6% of an adhesive, 2-7% of a sensitizer, and 9-42% of water-absorbent resin. The medium-low detonation velocity liquid explosive has the following advantages: (1) the energy density of the liquid explosive is diluted, and the detonation velocity of the liquid explosive is reduced; (2) the detonation velocity is easy to control and convenient to adjust, all components in the system are uniformly distributed, and energy density is uniform; (3) the detonation is reliable, the detonation velocity is easy to control, mechanical sensitivity is low, and the safety is high; (4) a large amount of water is brought into the liquid explosive and mixed uniformly, the explosion temperature generated during explosion is reduced, and water mist generated during explosion absorbs generated harmful gas and dust; and (5) the operation is convenient, the preparation method is simple, and the use cost is reduced.

The invention provides an explosive composite pipe preparation method based on an implosion method in a local vacuum environment. The explosive composite pipe preparation method comprises the following steps: a to-be-composited pipe 1, a to-be-composited pipe 2 and a pvc pipe are coaxially arranged in sequence from outside to inside; the pcv pipe is filled with a grain made of a detonator and explosive, and an explosive device of the to-be-welded pipes is formed; the two ends of a gap between the to-be-composited pipes are sealed by using sealing strips and vacuumized, and a vacuum gap environment is formed; and the explosive device is detonated, and to-be-composited materials are welded by utilizing high pressure generated by explosive explosion to obtain the explosive composite pipe. Compared with a traditional preparation method, the explosive composite pipe preparation method has the following advantages: higher energy utilization rate of the explosive, freer selection for the detonation velocity and higher operability are achieved; the phenomenon of large-area melting of a composite interface caused by insufficient discharge of a gap air layer in the traditional preparation method is completely eradicated; and the energy utilization rate of the explosive is effectively increased, and the production cost is greatly reduced.