24 results about "Volume density" patented technology

The application provides a self-flowing tundish working lining dry material, a tundish working lining and a preparation method thereof. The self-flowing tundish working lining dry material is prepared from the following components in parts by mass: 83-90 parts of fine powder with a particle size of 0.075-0.5 mm, 5 parts of fine powder with a particle size of less than 0.044 mm, 4-9 parts of a composite binding agent and 1-3 parts of a sintering agent; wherein the fine powder is at least one of forsterite, magnesia-calcia sand, magnesia and quartz sand. The self-flowing tundish working lining dry material has the advantages of low bulk density, low thermal conductivity, self-flowing forming, no harmful irritating gas and high environmental protection.

The invention discloses an armored sand-ceramsite bimodal proppant based on performance matching as well as a preparation method and application thereof, and relates to the technical field of oil and gas exploitation. The proppant comprises ceramsite and armored sand which are compounded according to the mass ratio of (20: 80)-(60: 40), the volume density ratio of the ceramsite to the armored sand is 0.9-1.1, the median particle size ratio of the ceramsite to the armored sand is 1.5-3.0, it can be ensured that the proppant is evenly and stably conveyed to a target crack, the ceramsite forms a bearing framework, gaps are filled with the armored sand, and a synergistic and stable composite supporting structure is constructed. According to the proppant, the four-in-one performance matching design of volume density, breakage rate, acid solubility and particle size is adopted, the obtained proppant is superior to a conventional proppant in breakage resistance, acid corrosion resistance and long-term flow guide performance, the preparation cost is low, the defects of performance mismatch, system failure and the like of the conventional proppant can be overcome, and the proppant has wide application prospects in hydraulic fracturing construction of oil and gas fields.

A powder comprising a metal oxide, wherein the powder satisfies the following conditions (1) and (2): (1) has a peak top of particle size in a range of 0.1 to less than 5 μm and in a range of 5 to less than 50 μm in a frequency distribution curve based on a volume-based particle size distribution obtained by a laser diffraction method, (2) a difference between a tap density and an initial bulk density satisfies the following relationship: 0.88 g / cm 3 ≤ (tap density - initial bulk density) ≤ 0.94 g / cm 3 .

The application discloses a yttria-corundum-mullite composite material, which comprises the following chemical components in percentage by mass: mullite 34.3%-34.475%, corundum 63.7%-64.025% and yttria 1.5%-2%; the apparent porosity of the composite material is 17.13%-18.03%; the composite material comprises corundum phase, mullite phase and yttrium aluminum garnet phase, and the yttrium aluminum garnet phase is generated by solid phase reaction of yttria and corundum in a high-temperature sintering process; by adding 1.5%-2wt% yttria as a modifier, the bending strength of the composite material is up to 58.53MPa, and the strength is improved by 131.50% compared with that of the corundum-mullite material without adding yttria; the apparent porosity is reduced to 17.13%-18.03%, the bulk density is optimized to 2.4333g / cm3, and the densification degree is greatly improved.

The present invention provides a SiC substrate capable of reducing cracking and cracking during substrate processing. The SiC substrate is provided with a biaxially oriented SiC layer, and when the entire region of an XRT image obtained by X-ray topography (XRT) measurement of the biaxially oriented SiC layer is divided into a lattice shape in which a region having a longitudinal direction of 4 mm * a transverse direction of 4 mm * a depth of 28 [mu] m is given per lattice, X (cm / cm < 3 >) represents the average volume density of basal plane dislocations (BPD) per lattice, and X (cm / cm < 3 >) represents the average volume density of the basal plane dislocations (BPD) per lattice. There are no continuous 10 cells or more on one vertical and horizontal straight line in a region that reaches 5X (cm / cm < 3 >) or more per cell.

The present invention relates to a silica glass porous body having a plurality of pores, the pores including open pores, the volume density of the silica glass porous body being 1.1 g / cm3 to 1.7 g / cm3, and the average pore diameter of the open pores as determined by mercury intrusion method being 50 [mu] m to 200 [mu] m.

Object Provided are acoustic article s that take into account the frequency dependence of acoustic performance due to high bulk density and laminated structure. Solution Means The acoustic article s include a first member 2 in sheet form made of a porous material, a first skin member 4 provided on a first primary surface of the first member on one side in the thickness direction, a second member 3 in sheet form made of a porous material. and a second skin member 6 provided on a second primary surface of the second member 3 on the other side in the thickness direction. The first member and the second member are laminated, with the first member and the second member secured to each other at least partially in the planar direction.

An acoustic structure includes a first core layer having a lattice structure between a first major surface and a second major surface, a first scrim coupled to the first major surface, a second scrim coupled to the second major surface, a second core layer having a lattice structure between a first major surface opposite a second major surface coupled to the second scrim, and a third scrim coupled to the second major surface of the second core layer. The acoustic structure has a bulk density of less than about 12 pounds per cubic foot.

There is provided a SiC substrate including a biaxially oriented SiC layer, wherein, in an XRT image obtained by subjecting the biaxially oriented SiC layer to X-ray topography (XRT) measurement, when the entire XRT image is divided into a lattice pattern giving a region of 4 mm longitudinal length×4 mm lateral length×28 μm depth per square and an average value of a volume density of basal plane dislocations (BPDs) per square is defined as X (cm / cm3), regions having 5X (cm / cm3) or more per square do not extend for 10 or more continuous squares in a straight line in either a longitudinal or lateral direction.

Three-dimensional nonwoven substrate (10) comprising the following: a first surface (12); a second surface (14); a first side margin (2000); a second side margin (2002); a first final edge (2004); a second end edge (2006); a central transverse axis (CL1); and a central longitudinal axis (CL2) that extends perpendicularly to the central transverse axis (CL1); wherein a line taken in a direction parallel to or perpendicular to the central transverse axis (CL1) of the three-dimensional nonwoven substrate (10) comprises the following: a first visually perceptible zone (110) in the nonwoven substrate (10) that is not provided with openings; and a second visually perceptible zone (120) in the fleece substrate (10); wherein the first visually perceptible zone (110) comprises a pattern of three-dimensional features (20) on the first surface (12) or the second surface (14); wherein at least some of the three-dimensional features (20) define a microzone comprising a first area (300) and a second area (310), and wherein the first area (300) and the second area (310) exhibit a value difference for an intensive size; where the intensive size of the first visually perceptible zone (110) is base weight, thickness or volumetric density; where the base weight, thickness, or volumetric density of each region is greater than zero; and where the second visually perceptible zone (120) defines openings (13), wherein the openings (13) have an effective opening area, according to the opening test herein, in a range of about 0.3 mm 2 up to about 15 mm 2exhibiting and wherein the second visually perceptible zone (120), according to the opening test herein, exhibits an effective open area in a range of about 3% to about 50%.

One aspect is a process for producing a layered body. A first powder is introduced into an interior volume to obtain a first powder layer. The interior volume has a cross-sectional width of at least 200 mm and is bordered by an interior surface of a die having a wall of carbon. The first powder is a mixture comprising a first and further constituent powder of different chemical compositions. The first powder layer is subjected to an electrical-voltage-generated heat and to a pressure to obtain the layered body. The further constituent powder has a particle size distribution D = q(χ) of volume density q over particle size χ, such that D has a global maximum α at particle size χα with volume density qα, and if D has a local maximum β at particle size χβ with volume density qβ, then qα / qβ is at least 10.

The invention provides a method and a system for predicting particle size distribution of a sintered mixture after granulation. According to the method, raw materials are divided into fine particles smaller than a preset threshold value and coarse particles larger than the threshold value; when the total weight percentage of the fine particles meets a preset condition, the method calculates the growth volume ratio of the particles based on the particle size distribution and proportion of the raw materials and a group of physical parameters including apparent density, bulk density and fine particle adhesion ratio. And finally, predicting the target particle size of the coarse particles based on the V%, and determining the final particle size distribution in combination with the amount of the non-adhered fine particles. According to the method, key parameters such as the adhesion ratio reflecting the internal balling performance of the raw materials are introduced, a simple and accurate prediction model is constructed, prospective regulation and control of the granulation granularity can be achieved in the batching stage without complex data training, and the method has important industrial application value.

The invention discloses an optimal design method of a hydrographic measurement heavy hammer, the heavy hammer and a measurement system. The method comprises the following steps: determining a water surface and water bottom tension change threshold value, a sinking speed and mass and volume constraints; establishing an optimization model which takes the weight volume V, the material density rho and the shape parameter as decision variables and takes the minimum mass m as a target function; and solving the model to obtain an optimal solution and determining the specification of the heavy hammer. The heavy hammer is designed and manufactured according to the method, the shape of the heavy hammer can be spherical, drop-shaped or torpedo-shaped, and the optimal parameters are as follows: the volume V0 is approximately equal to 1.3265 * 10 <-4 > m < 3 >, the density rho0 is approximately equal to 2922kg / m < 3 >, and the mass m0 is approximately equal to 0.3875 kg. The heavy hammer body can adopt a separable assembly structure, a balancing weight can be arranged in the heavy hammer body to adjust the density, and a temperature sensor and a wireless communication module can be integrated. According to the invention, empirical design is converted into scientific optimization, a tension change signal (deltaT1 is greater than or equal to 1.3 N, and deltaT2 is greater than or equal to 2.5 N) is ensured to be obvious, the sinking speed is high (greater than or equal to 1m / s), meanwhile, light weight (m is less than or equal to 0.5 kg) and multifunctional integration are realized, and the contradiction among measurement reliability, efficiency and equipment portability is effectively solved.

The invention relates to the field of stability evaluation experiment devices, and discloses a stability evaluation experiment device and method for a refractory material after erosion resistance, and the evaluation experiment method comprises the following steps: preparing N cylinders with the diameter of 50mm + / -0.5 mm and the height of 50mm + / -0.5 mm on a refractory brick manufactured by the same production process, the parallelism of a sample is not more than 0.2 mm, the perpendicularity of the sample is not more than 0.5 mm, and the thickness of the sample is not more than 0.2 mm; respectively measuring the surface area, the apparent porosity and the volume density of the sample, and selecting the sample with the volume density deviation smaller than 0.02 g / cm < 3 > as a standard sample to be detected; and testing the normal-temperature compressive strength of one sample in a room-temperature environment to obtain the original compressive strength P0. According to the technical scheme, the performance of the refractory material is evaluated through a thermal shock stability attenuation experiment method and a reducing gas erosion attenuation resisting method, and the technical effect that the strength change rule of the product under the conditions of rapid temperature change, reducing gas erosion and compression is comprehensively reflected is achieved.

The utility model relates to the technical field of material analysis by a weighing method, in particular to an apparent porosity and volume density measuring device. The apparent porosity and volume density measuring device comprises a metering scale, a support is arranged on a weighing platform of the metering scale, a suspension structure is arranged at the upper end of the support, a tray used for sinking into liquid is suspended on the suspension structure through a lifting rope or a lifting rod, a limiting structure is arranged on the upper side of the tray, and the limiting structure is provided with a containing groove for containing a to-be-measured object. The storage groove is provided with a limiting wall used for limiting the to-be-detected object so as to keep the position of the to-be-detected object in the liquid. When the mass of a to-be-measured object in liquid needs to be weighed, the to-be-measured object is placed in the liquid and placed in the storage groove of the limiting structure on the tray, the limiting wall of the storage groove is used for limiting the to-be-measured object so as to keep the position of the to-be-measured object in the liquid, and then the to-be-measured object can be weighed through the metering scale. And an object to be detected is placed in the object placing groove, so that the operation is relatively convenient.

One aspect is a process for producing a layered body. A first powder is introduced into an interior volume to obtain a first powder layer. The interior volume has a cross-sectional width of at least 200 mm and is bordered by an interior surface of a die having a wall of carbon. The first powder is a mixture comprising a first and further constituent powder of different chemical compositions. The first powder layer is subjected to an electrical-voltage-generated heat and to a pressure to obtain the layered body. The further constituent powder has a particle size distribution D = q(χ) of volume density q over particle size χ, such that D has a global maximum α at particle size χα with volume density qα, and if D has a local maximum β at particle size χβ with volume density qβ, then qα / qβ is at least 10.

The invention belongs to the technical field of non-destructive detection of refractory material products, and discloses a non-destructive detection method for internal structure defects of a refractory material based on radar scanning, which aims at special refractory material products such as cast products with higher density, sintered products with higher volume density and the like, and detects the internal structure defects of the refractory material through linear scanning or regional scanning. The method comprises the following steps: forming a time slice view of which the observation thickness can be randomly adjusted by combining a linear waveform, a two-dimensional map and a migration view, and identifying and judging the types, sizes and positions of defects in the refractory material product by integrating all imaging characteristics and data to form a multi-dimensional data analysis system; quantitative analysis on internal defects such as shrinkage porosity and closed pores of the refractory material is realized; the method is non-destructive, compared with conventional detection means such as infrared rays and X-rays, the method is simpler, more convenient and safer, the accuracy and comprehensiveness of internal structure defect recognition are improved, a reliable non-destructive detection means is provided for quality control of refractory material products, and the method has definite industrial application value.

A density meter for automatic testing of asphalt mixtures and its method of use. The density meter includes: a testing component, a replenishment component, and a lifting and wiping component; a weighing device is provided on the upper surface of its discharge platform, and the weighing device measures the mass m of the specimen outside the water storage tank. a The system selects between the first and second working modes; the working modes are suitable for asphalt mixtures with a water absorption rate of no more than 0.5% and no more than 2%; the weighing device measures the mass m of the specimen in the water tank. w The relative density γ was calculated. a Apparent density ρ a and water absorption rate S a relative density of hair volume γ f ρ of bulk density f The method of use is for using the density meter described above. This solution effectively solves the problems of high labor costs and errors that easily occur during repeated and multiple measurements in the existing testing process.

Techniques for determining a geologic property of a rock sample include (i) measuring, using nuclear magnetic resonance (NMR), a volume of a fluid retained within a solid matrix of a processed rock sample; (ii) measuring, using a gas porosimeter, a volume of gas space of the processed rock sample; (iii) measuring, with an Archimedes assembly, a first mass value in air of the processed rock sample and a second mass value in a liquid of the processed rock sample; and (iv) determining, based at least on the measured volume of the fluid, the measured volume of the gas space, and the measured first and second mass values, at least one of a bulk volume, a bulk density, a grain density, or a porosity of the processed rock sample.

The invention discloses a preparation method of a high-density C / SiC ceramic composite material and a product thereof, and the preparation method comprises the following steps: 1) carrying out degumming and pyrolytic carbon deposition on a carbon fiber woven body to obtain a preform; (2) preparing a precursor solution by taking polycarbosilane as a precursor, and carrying out multiple times of impregnation and cracking treatment on the preform by adopting a PIP process to obtain a blank of which the density is greater than or equal to 1.75 g / cm < 3 >; (3) preparing a Pickering emulsion by taking silicon carbide as a raw material, and carrying out multiple times of impregnation and cracking treatment on the blank to obtain a blank with the density being greater than or equal to 2.0 g / cm < 3 >; finally, carrying out primary impregnation and pyrolysis treatment by using the precursor solution; according to the method, the density of a finished product sample piece can be effectively improved, the deviation of the special-shaped structure of the product is reduced, the mechanical property of the product is improved, the tensile strength of the obtained product is larger than or equal to 336 Mpa, the impact toughness is larger than or equal to 40 KJ / (m < 2 >), the volume density is larger than or equal to 2 g / cm < 3 >, and the performance requirements of the high-density and high-mechanical-property C / SiC ceramic composite material with the special-shaped structure are met.

This invention relates to a lightweight, high-strength, and high-toughness TiB2-TiC-based cermet composite material with a dual "core-ring" structure and its preparation method. The mass percentage composition is as follows: TiB2: 45%–80%; TiC: 0–30%; Co: 5–13%; Ni: 5–13%; the sum of the mass percentages of each component is 100%. The raw material powder is ball-milled, vacuum-dried, sieved, and pressed into shape. A vacuum reduction-vacuum liquid-phase sintering-solution extraction integrated technology is adopted, and sintering is performed between 1450℃ and 1480℃ to prepare the lightweight, high-strength, and high-toughness TiB2-TiC-based cermet with a dual "core-ring" structure. Its bulk density is 4.96–5.11 g / cm³. 3 The hardness is 89.1–94.4 HRA, the flexural strength is 1576.61–1724.86 MPa, and the fracture toughness is 10.47–11.48 MPa·m. 1 / 2 Compared with existing TiB2-based cermets, the overall mechanical properties are significantly improved. The preparation process of this invention is simple and suitable for industrial production, and it has broad application prospects in precision machining cutting tools, wear-resistant parts, forging machine hammers, composite casting, electrode materials, and other fields.

One aspect is a process for producing a layered body. A first powder is introduced into an interior volume to obtain a first powder layer. The interior volume has a cross-sectional width of at least 200 mm, and is bordered by a die of carbon. The first powder is a mixture comprising a first constituent powder and a further constituent powder of different chemical compositions. The first powder layer is subjected to a heat, generated by a voltage, and to a pressure to obtain the layered body. The further constituent powder has a particle size distribution D=q(χ) of volume density q over particle size χ, such that D has a first local maximum α at particle size χα with volume density qα, D has a second local maximum β at particle size χβ with volume density qβ, χα>χβ, and qα / qβ is at least 1.

The present invention discloses a method for testing the bulk density of porous and complex-shaped materials, which mainly comprises the following steps: step 1, preparing a hydrophobic spray coating with a pore-sealing function: adding 2-8wt% of a binder to the hydrophobic coating, mechanically mixing for 10-30 minutes to obtain the hydrophobic spray coating, and setting aside; step 2, spraying: a. blowing compressed air on the surface of a sample to be tested for 1-2 minutes to prevent the surface from adsorbing or adhering to impurity particles; b. using a 0.5-1.0mm caliber high-pressure spray gun, adding the hydrophobic spray coating, adjusting the spray gun pressure to 80-200Pa, and evenly spraying the surface of the sample to be tested 2-3 times to make the coating thickness within the range of 5-10μm; c. after uniform spraying, drying the sample to be tested; step 3, experimental testing: using a drainage method to test the bulk density of the sample to be tested after spraying the hydrophobic coating.

The invention relates to the field of material testing, in particular to a rapid evaluation method for the volume density of light plastering gypsum. According to the method, the time-consuming bottleneck of traditional testing is broken through by constructing the quantitative relation model of the wet density and the dry density. The method comprises the following core steps: (1) determining the hydration water consumption of a gypsum system: determining the water consumption (b%) required by complete hydration of gypsum through an actual measurement method or a theoretical calculation method; (2) obtaining real-time parameters: measuring the standard consistency water addition amount (w%) and the wet density (rho wet) of the freshly mixed slurry; and (3) quickly calculating the dry density: calculating the volume density (dry volume weight) through an exclusive formula based on the hydration water amount, the water adding amount and the wet density. According to the method, the volume density can be calculated based on the instant measurable parameters (such as the wet density and the water adding amount), instant evaluation of the volume density in the production process can be achieved so as to facilitate timely regulation and control, the defects that a traditional testing method is long in period and poor in timeliness are overcome, and the method is high in accuracy.