34 results about "Dilatometer" patented technology

An ultrasensitive ratiometric capacitance dilatometer and related methods are described. The dilatometer provides a capacitance measurement based on a ratiometric capacitance, or the capacitance ratio measured between two or more parallel plate capacitors of the dilatometer. In this regard, an absolute capacity bridge is not required, and even more advantageously, the effects of adsorbed gas are greatly reduced compared to conventional dilatometers. The ratiometric capacitance dilatometer provides a symmetrical configuration, which reduces the effects of temperature gradients. Moreover, certain embodiments provide a “v-groove design”, wherein a first parallel plate capacitor forms an angle with a second parallel plate capacitor of the dilatometer along a key centerline of the dilatometer cell, which improves manufacturability due to simpler grinding, metalizing and assembly.

The invention discloses a dilatometer. The dilatometer at least comprises a base, a container arranged on the upper side of the base, a vertical dial indicator and a horizontal dial indicator, wherein the container consists of a base plate and a side wall; a cuboid soil sample is arranged in the container; a vertical force measurement plate is arranged on the upper side of the cuboid soil sample; a horizontal force measurement plate capable of moving along the normal direction of more than one side wall of the cuboid soil sample with the dilation of the soil sample is leaned on the side wall; the vertical dial indicator and the vertical force measurement plate are contacted with each other tightly and vertical to each other; and the horizontal dial indicator passes through a dial indicator insertion hole formed in the side wall of the container and is contacted with the horizontal force measurement plate tightly and vertical to the horizontal force measurement plate. By the dilatometer, a user can observe the dilated deformation of the soil sample in vertical and horizontal directions at the same time.

The invention discloses a method for measuring the β phase transition temperature of a titanium / titanium alloy based on a dynamic thermal simulator, comprising the steps of: preparing a sample, welding a first thermocouple in the middle of the sample; performing a thermal expansion test on a sample, And a thermal dilatometer is installed on the outside of the sample, and the dL-T curve of the sample is recorded by the thermal dilatometer; the linear change region of the high temperature zone of the dL-T curve is determined; 0 ‑5°C is the upper limit temperature, and the multi-stage quenching temperature is selected downwards with a specific inter-stage temperature difference. The first-stage quenching temperature corresponds to one sample for quenching; observe the metallographic structure of the sample after quenching, and then obtain the β phase transition temperature. The method of the invention overcomes the defects of long cycle time, heavy workload and low precision in the prior art, can complete the measurement in the shortest 3.8 hours, and has the advantages of simple sample preparation requirements and the like.

The invention provides a method for testing the heat shrinkage of glass, which uses a glass thermal dilatometer to anneal the tested glass sample, and further uses a thermal dilatometer to test the thermal shrinkage of the glass. The test method integrates annealing and testing in the same instrument. , At the same time, because the test of the thermal dilatometer is accurate, fast and convenient, it reduces the manual error in the test and provides a guarantee for the accurate test of glass performance.

The invention relates to an anti-creep dilatometer, which comprises a left bracket and a right bracket which can move relative to each other or move opposite to each other in the left and right directions, and the left and right brackets are provided with displacement sensors for measuring the displacement of the right bracket relative to the left bracket, The left bracket is provided with a left clamping assembly for clamping and fixing the sample whose displacement measurement direction is the left and right directions, and the right bracket is provided with a right clamping assembly for clamping and fixing the sample. The direction of the clamping force of the clamping assembly on the sample is perpendicular to the left-right direction. The invention solves the problem in the prior art that the sample is prone to creep deformation in the measurement direction due to the clamping force under high temperature conditions.

The invention relates to a drug release measuring device and a drug release measuring method which are provided for an endovescular stent. The invention solves the problem that the existing measuring device cannot simulate the condition within a human body or measure the deposition and distribution of the drug on vascular tissues. The method mainly comprises: a buffer solution is prepared; an animal vessel is separated and fixed, the stent is implanted and expanded, and a flow environment within the body is simulated; and samples are collected and tested. The measuring device comprises a reservoir, a silicone tube, a glass tube, a vessel implantation groove, a diaphragm capsule dilatometer, a flow valve, a high pressure gas cylinder and a peristaltic pump, wherein, the reservoir is connected with the vessel container by the glass tube; the vessel implantation groove is connected with the reservoir by the glass tube which contains the diaphragm capsule dilatometer and the flow valve; the reservoirs are connected together by the silicone tube which is provided with the peristaltic pump; the high pressure gas cylinder is connected with the reservoir by the silicone tube. The invention can not only simulate the flow condition within body accurately which can provide better support for the vivo experiment, but also measure the deposition and distribution of the drug on the vasculartissues.

The invention discloses a measurement method for bulk metallic glass structural relaxation activation energy. The method includes representation of bulk metallic glass structural relaxation behavior and measurement of relaxation activation energy. Representation of bulk metallic glass structural relaxation behavior includes cutting, grinding and polishing of a bulk metallic glass sample, and thermal insulation in a thermal dilatometer for measurement of the length change of the sample in structural relaxation. The measurement method of structural relaxation activation energy includes fitting processing of the sample's length change curve data of bulk metallic glass in isothermal structural relaxation, and calculation of the bulk metallic glass's relaxation structural activation energy with quasi-steady state relaxation state at different isothermal temperatures. According to the method provided by the invention, the bulk metallic glass sample is placed in the thermal dilatometer for thermal insulation, thus being conducive to in situ observation of the structural relaxation process, convenient calculation of the structural relaxation activation energy, and exploration of the metallic glass structural relaxation internal mechanism.

The invention discloses a method for measuring the expansion coefficient of glass. The method comprises: sending a flake or block glass sample to be measured into a dilatometer to measure the expansion coefficient. The method is characterized in that, before being sent into the dilatometer for measurement, the method It also includes pretreatment of the glass sample to be tested. The pretreatment method includes: melting the glass sample to be tested and drawing it into a glass filament with a diameter of Φ±0.1 mm, and then annealing the glass filament; wherein, Φ is 1.5-6 mm. The method of the invention has low sample processing difficulty, short sample preparation time, and high stability and accuracy of expansion coefficient test.

The invention relates to an expansive soil two-dimensional dilatometer, and can effectively solve the problem that the expansion deformation and expansion force in both the vertical direction and the lateral direction cannot be measured at the same time by the conventional dilatometer. The expansive soil two-dimensional dilatometer adopting the technical scheme is characterized by comprising a testing stand and a pressure chamber arranged on the testing stand, wherein the pressure chamber adopts a square tubular structure which is provided with a left end opening and a right end opening, and is defined by a bottom plate and a top plate arranged in an up-and-down spaced manner and a front clamping plate and a back clamping plate arranged in a front-and-back spaced manner; the space jointly defined by two side press plates, a pressurizing plate, the bottom plate, the front clamping plate and the back clamping plate forms an accommodating space for a test soil sample; sliding mechanisms are connected with a loading mechanism arranged on the testing stand through flexible ropes; a first displacement sensor is arranged on a pressure transfer plate to be used for measuring the vertical displacement of the pressure transfer plate; second displacement sensors are arranged on force transfer rods to be used for measuring the horizontal displacement of the force transfer rods. The expansive soil two-dimensional dilatometer is novel and unique in structure, simple, reasonable, easy to produce, simple to operate, and low in cost; a test of expansion deformation or expansion force can be carried out by only one instrument, so that the use is convenient, and the effect is good.