12results about How to "Increased Diffusion Depth" patented technology

The invention provides a method for strengthening the coercive force of a neodymium-iron-boron magnet through composite reduction grain boundary diffusion, which comprises the following steps of: (1) mixing a reducing agent, a dispersing agent and a composite rare earth diffusion source to obtain mixed powder; the composite rare earth diffusion source comprises a multi-element rare earth compound diffusion source and / or a composite compound diffusion source; (2) coating the mixed powder obtained in the step (1) on the surface of a neodymium-iron-boron magnet to obtain a coating layer magnet; and (3) carrying out sectional composite reduction-grain boundary diffusion heat treatment and tempering treatment on the coated magnet in the step (2) to obtain the neodymium iron boron diffusion magnet. According to the method, the composite rare earth diffusion source is adopted, the preparation cost of the neodymium iron boron diffusion magnet is reduced, meanwhile, the grain boundary diffusion efficiency is improved, and the large-scale market application prospect is achieved.

The invention discloses a grain boundary diffusion method of a high-performance sintered neodymium-iron-boron magnet. The preparation method comprises the following steps: sequentially carrying out hydrogen decrepitation, jet milling, magnetic field forming, cold isostatic pressing and low-temperature presintering treatment on a neodymium-iron-boron alloy rapid hardening sheet to obtain a presintered neodymium-iron-boron magnet; depositing a non-rare earth metal or metal oxide film layer on the surface of the pre-sintered magnet by using a pulse laser deposition process; performing diffusion heat treatment on the neodymium-iron-boron magnet deposited with the non-rare earth metal or metal oxide film layer; depositing a heavy rare earth element film layer on the surface of the treated neodymium-iron-boron magnet by using the pulse laser deposition process again; and performing diffusion heat treatment and tempering treatment on the treated neodymium-iron-boron magnet. According to the method, the diffusion cost is reduced, meanwhile, the diffusion depth of heavy rare earth elements in the magnet is increased, the neodymium-iron-boron magnet with high coercive force and high magnetic energy product is prepared, and the urgent application requirements of emerging industries such as rare earth permanent magnet motors are met.

The invention relates to the technical field of sintered neodymium-iron-boron magnet preparation technologies, in particular to a sintered neodymium-iron-boron pressure-assisted grain boundary diffusion enhancing method and a sintered neodymium-iron-boron magnet, and the sintered neodymium-iron-boron pressure-assisted grain boundary diffusion enhancing method comprises the following steps: S1, after a neodymium-iron-boron magnet is sintered, low-temperature pre-aging cooling is performed to normal temperature; s2, performing slicing, diffusion pretreatment, rare earth diffusion source coating, non-rare earth diffusion source pressure compounding and diffusion heat treatment on the pre-aged magnet; the composition of a sintered neodymium-iron-boron magnet matrix is RE < x > M < y > B < z > Fe < 100-x-y-z >, wherein RE comprises at least two elements of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; the strength and toughness of the magnetic steel are improved, the unfilled corner rate is reduced, meanwhile, the grain boundary phase width is increased through pre-aging, a channel is provided for diffusion, the diffusion effect is improved, and the temperature coefficient of a product is improved, so that a diffusion source, especially a spraying or printing diffusion source, is better combined with a substrate.

The invention relates to a method for improving the binding force of a neodymium-iron-boron magnet coating and application. The method comprises the steps that rare earth hydroxide suspension liquid is prepared; spraying double surfaces of the neodymium-iron-boron magnet; and carrying out grain boundary thermal diffusion treatment. According to the method, the rare earth hydroxide is pyrolyzed into the rare earth oxide to be deposited on the surface of the sintered neodymium-iron-boron magnet, the diffusion depth of heavy rare earth elements in the magnet can be effectively increased, and the components and thickness of the coating are accurately controlled; the cost of preparing the rare earth oxide from the rare earth hydroxide is saved, the preparation process of the diffusion source is simplified, and the spraying efficiency is high; the obtained coating is high in quality and low in porosity, and the bonding strength of a diffusion source and a magnet interface is high; subsequent grain boundary diffusion can be promoted, and a new thought is provided for industrial application of the grain boundary diffusion technology.

The invention discloses a large-size high-performance R-T-B rare earth permanent magnet and a preparation method thereof. The thickness of the magnet in the orientation direction is 4-14 mm; the residual magnetism Br of the large-size high-performance magnet is greater than or equal to 14.0 kGs, and the coercive force Hcj is greater than or equal to 23.0 kOe. When the magnet base body is prepared, a layered powder laying mode is adopted, so that the surface layer of the magnet is made of single alloy easy to diffuse, the core part of the magnet is made of double alloy, it is guaranteed that the core part of the magnet has high coercive force, meanwhile, the grain boundary diffusion capacity of the surface layer of the magnet is optimized, and the advantages of the double alloy and grain boundary diffusion are fully combined. Besides, an alloy of a low-melting-point metal element M2 and a heavy rare earth element RH in a certain proportion is adopted as an auxiliary alloy and a grain boundary diffusion source, the diffusion depth of the heavy rare earth element RH is promoted, excessive enrichment of the heavy rare earth element RH in a small area is prevented, and generation of body diffusion is inhibited. According to the method, the coercive force of the magnet is remarkably improved, meanwhile, it is guaranteed that the magnet has high residual magnetism, and the large-size high-performance R-T-B rare earth permanent magnet is prepared.

The invention discloses a method for preparing a neodymium iron boron permanent magnet through composite diffusion, and relates to the technical field of rare earth permanent magnet material processing. The method comprises the following steps: step 1, weighing a main alloy material and an auxiliary alloy material; secondly, the main alloy material is smelted and cast into a throwing piece through a piece casting furnace, and then the throwing piece is subjected to annealing treatment. According to the invention, through a composite grain boundary diffusion technology, evaporation treatment is firstly carried out to obtain an intermediate-state magnet, so that the demagnetization exchange coupling effect between adjacent main phase grains is enhanced, and a channel beneficial to subsequent diffusion of heavy rare earth elements is also formed; and then complete diffusion between grain boundaries is achieved, the maximum diffusion depth is achieved, and the best diffusion effect is achieved through subsequent aging treatment.

The application discloses a kind of bistable suction disc devices for enhancing the performance of microneedle and preparation method thereof, belong to medical instrument technical field, the bistable suction disc device structure includes elastic hemispherical shell, and the outer wall of elastic hemispherical shell is provided with convex column, and the axis of convex column and elastic hemispherical shell coincides, and the inner wall of elastic hemispherical shell is provided with microneedle patch mounting platform, and microneedle patch mounting platform is located just below the convex column, and the platform is combined with microneedle patch;Elastic hemispherical shell includes first stable state and second stable state, and first stable state is open downward state, and second stable state is open upward state, and it changes first stable state and second stable state when using, so that the negative pressure area between the inner wall of elastic hemispherical shell and skin, enhance the drug delivery efficiency of microneedle on microneedle patch and skin interstitial fluid collection amount.The bistable suction disc device has wide application prospect in the field of biomedicine.

The invention provides a preparation method of a high-performance grain boundary diffusion sintered neodymium iron boron material, and belongs to the technical field of permanent magnet materials. The low-melting-point heavy-rare-earth-free alloy coating is coated and cured on the easy-to-diffuse surface of the neodymium-iron-boron base material magnet, and the heavy-rare-earth alloy coating is coated and cured on the low-melting-point heavy-rare-earth-free alloy coating; and the coated magnet is sequentially subjected to low-temperature pre-diffusion heat treatment, grain boundary diffusion heat treatment and aging treatment, and then the grain boundary diffusion neodymium-iron-boron magnet is obtained. According to the invention, the diffusion efficiency of heavy rare earth elements can be effectively improved, the coercive force of the magnet is improved, and relatively high residual magnetism can be achieved.

The invention provides a composite diffusant for grain boundary diffusion of a neodymium-iron-boron magnet, a grain boundary diffusion method of the neodymium-iron-boron magnet and the neodymium-iron-boron magnet. The composite diffusant comprises 20 wt%-50 wt% of a diffusion precursor, 50 wt%-80 wt% of a diffusion alloy and 0.5 wt%-5 wt% of an additive. The diffusion precursor comprises one or more of magnesium oxide and zinc oxide; the diffusion alloy comprises an RAlCu alloy, wherein R represents one or more of La, Ce, Pr, Nd, Dy and Tb; the additive comprises an Al70Cu30 alloy and a first thermoplastic binder, and the mass fraction of the Al70Cu30 alloy is greater than or equal to 40% based on the total mass of the additive. The composite diffusant can reduce the use amount of heavy rare earth during grain boundary diffusion of the neodymium-iron-boron magnet, the diffusion efficiency is improved, the diffusion process is simplified, and the magnet performance is improved.

The present disclosure provides a semiconductor structure and a manufacturing method thereof and a wafer bonding method. The manufacturing method of the semiconductor structure includes: providing a substrate, wherein a conductive line is formed in the substrate; forming a conductive contact pad on the surface of the conductive line, wherein the cross-sectional area of ​​the conductive contact pad is greater than the cross-sectional area of ​​the conductive line; forming a damaged layer on the surface of the conductive contact pad; and processing the damaged layer to recrystallize the damaged layer to form a recrystallized layer. The embodiments of the present disclosure can improve the degree of fusion between metals during wafer bonding and optimize the wafer bonding effect.

The present disclosure relates to a sintered Nd-Fe-B magnet and a method for preparing the sintered Nd-Fe-B magnet, the method comprising the following steps: S1, preparing a sintered Nd-Fe-B magnet substrate; S2, attaching a diffusion source containing RE to the surface of the sintered Nd-Fe-B magnet substrate, and then performing grain boundary diffusion treatment and tempering treatment; RE is Dy and / or Tb; wherein the grain boundary diffusion treatment comprises an initial diffusion heat treatment and N stages of diffusion process segments, N≥1, each stage of the diffusion process segment comprises, in sequence, a high-temperature diffusion heat treatment and a low-temperature diffusion heat treatment; the low-temperature diffusion heat treatment has a temperature of 850-950 ℃ and a time of 6-12 h; the high-temperature diffusion heat treatment has a temperature lower than the sintering temperature and 50-200 ℃ higher than the temperature of the low-temperature diffusion heat treatment, and a time of 2-8 h. The method can promote the diffusion of heavy rare earth elements to the central region of the sintered magnet in the grain boundary diffusion process, and further improve the comprehensive magnetic properties of the sintered Nd-Fe-B magnet.

The application discloses a grain boundary diffusion material, a neodymium-iron-boron magnet material and a preparation method and application thereof. The grain boundary diffusion material comprises a sintered body and a diffusion source. The sintered body comprises the following components: R: 29-32 wt.%, R being a rare earth element; M: 0.1-2 wt.%, M comprising one or more of Cu, Ga and Co; B: 0.9-1.0 wt.%; Fe: 65-70 wt.%, wt.% being the percentage of the mass of each component to the total mass of the sintered body. The diffusion source comprises the following components: Tb: 60-85 wt.%; Ga: 10-30 wt.%; Cu: 5-20 wt.%, wt.% being the percentage of the mass of each component to the total mass of the diffusion source. The grain boundary diffusion material can significantly improve the coercivity of the neodymium-iron-boron magnet material, while maintaining high remanence and high-temperature stability of the magnetic performance.