34results about How to "Adjustable expansion coefficient" patented technology

The invention discloses Ce-containing low-temperature sealing glass as well as preparation and application method of the Ce-containing low-temperature sealing glass. The Ce-containing low-temperature sealing glass consists of the following raw materials: B2O3, Bi2O3, ZnO and Ce(NO3)3 in a molar ratio of (10-50):(20-40):(5-30):(0-30). Through the coordination between high-concentration Bi2O3 and B2O3, the softening temperature of glass is lowered, so that low-temperature sealing is realized; Ce<3+> in a glass network prepared by melting quenching is transformed into Ce<4+>, the transformation of Bi<3+> in glass into Bi<5+> is prevented, and the refractive index of glass is stabilized; and Ce not only can further lower the softening temperature of the sealing glass, but also can adjust the expansion factor of the glass so as to remarkably improve the sealing property of the sealing glass. Moreover, Ce remarkably reduces the surface tension of the glass, improves the interface bonding property between the sealing glass and an alloy connector and is applicable to the field of photoelectric materials and other low-temperature precise sealing. According to the invention, the preparation raw materials are simple and easily available, the cost is low, the technology is simple and feasible, and the prepared low-temperature sealing glass has good performance and stable refractive index and meets the conditions of practical utilization and industrialization.

The invention discloses a hole plugging material for low-expansion wall flow honeycomb ceramic. A base material of the hole plugging material consists of the following raw materials in percentage by mass: 40-70 percent of a low-expansion material, 10-35 percent of a heating volume expansion agent, 10-30 percent a mineralizer and 10-20 percent an inorganic plasticizer; and the hole plugging material comprises 6-10 percent of an organic additive and 18-35 percent of water relative to the mass percentage of the base material. Moreover, the invention further discloses a method for plugging wall flow honeycomb ceramic by using the hole plugging material. The hole plugging material has a controllable and adjustable expansion coefficient and can be matched with the expansion coefficient of a honeycomb ceramic material, and the bonding strength of the hole plugging material and a honeycomb ceramic hole wall is enhanced greatly, so that thermal impact resistance is effectively improved, and the airtightness of a plugged duct of the honeycomb ceramic is ensured. Moreover, a plugging method is easy and practicable, has high production efficiency and superior performance, and has contribution to popularization and use.

The invention discloses a copper-covered ALSiC composite radiating substrate which comprises an ALSiC substrate body and a copper layer attached to the ALSiC substrate body. A copper-aluminum spinel interface is formed between the copper layer and the ALSiC substrate body. The ALSiC composite radiation substrate is simple in structure, good in radiating performance, capable of solving the problem that the radiating substrate body is not matched with thermal expansion of a chip material, capable of preventing an LED chip packaged on the substrate body from being easily disengaged, capable of prolonging the service life of an LED and applicable to manufacturing of low-cost large-power LEDs.

The invention discloses a composition and a production method of gold colloid colored fusible gold ruby glass adopting bismuth borosilicate glass as a matrix. The composition of the fusible gold ruby glass comprises 0-10 wt% of Na2O, 0-15 wt% of K2O, 0-2 wt% of Li2O, 10-60 wt% of Bi2O3, 2-15 wt% of B2O3, 25-50 wt% of SiO2, 0-5 wt% of ZnO, 0-3 wt% of Al2O3, 0.5-3 wt% of Sb2O3, 0.5-1.5 wt% of SnO and 0.01-0.1 wt% of Au. Compared with lead-containing fusible gold ruby glass produced through traditional methods, the gold ruby glass produced in the invention has similar spectral properties and good chemical stability. The colloid colored glass produced in the invention has beautiful color and very good practical application prospect; and bismuth oxide replaces lead oxide to avoid pollution to the environment and damages to organisms during the use process, so the "green production" requirement is met.

The invention discloses microcrystalline glass brazing filler metal, a preparation method thereof and a method for connecting ferrite and belongs to the technical field of ferrite brazing connection.The microcrystalline glass brazing filler metal, the preparation method thereof and the method for connecting the ferrite aim to solve the problem that due to long-time use, the performance stabilityof a microwave ferrite device is affected. The brazing filler metal (20-x) Li2O-xY2O3-35Fe2O3-(20-y)BaO-25SiO2-yCr2O3 is prepared by adopting a fusing-cold quenching method. The method for connectingthe ferrite includes the steps that yttrium ferrite is pretreated, the microcrystalline glass brazing filler metal is adjusted to be in a uniform paste shape with terpilenol, and then the portion between to-be-connected faces of the pretreated yttrium ferrite is uniformly coated with the microcrystalline glass brazing filler metal in a silk-screen printing method to form a to-be-welded part, and drying is performed; and then pressure is applied to the to-be-welded part, brazing treatment is performed, cooling with a furnace is performed, and then ferrite connection is completed. Strength of aconnection joint acquired through the microcrystalline glass brazing filler metal is high and is (90-100MPa), the thermal stability and the corrosion resistance of the joint are improved, and therefore the service life of the ferrite device is prolonged, and the using period stability of the ferrite device is improved.

The invention discloses Sn-containing low-temperature seal glass and preparing and using methods thereof. The Sn-containing low-temperature seal glass is composed of B2O3, Bi2O3, ZnO and SnO2 according to a molar ratio of 10-50:20-40:5-30:0-30. Softening temperature of the glass is lowered through synergism of high-concentration Bi2O3 and B2O3 to realize low-temperature seal; Sn2+ in a glass network prepared through melting-quenching is converted into Sn4+ in the process of heating, conversion from Bi3+ in the glass to Bi5+ is stopped, and refractivity of the glass is stabilized; Sn can further lower the softening temperature of the seal glass and can adjust expansion coefficient of the glass, so that seal performance of the seal glass is improved remarkably; the glass is suitable for photoelectric materials and other low-temperature precise seal fields. The raw materials for preparation are simple and easy to obtain, the preparation method is stable, low in cost and simple and easy to implement, and practical and industrial conditions are met.

The invention belongs to the technical field of graphene preparation, and in particular relates to a composite material for thermal management and a preparation method thereof. The composite material includes two metal layers arranged at intervals and a first heat transfer layer and a second heat transfer layer arranged on the two metal layers, and the heat transfer layer of the first heat transfer layer and the second heat transfer layer The interfaces are perpendicular to each other; the composite material is a thermal management material integrated in the horizontal direction and the vertical direction. It is an efficient thermal management structure vertically located between the heat source and the heat sink. The composite material has good thermal conductivity and integration with Circuit chip thermal expansion coefficient matching.

The invention discloses an LED packaged with an AlSiC composite substrate. The LED comprises the AlSiC composite cooling substrate, an LED light source module, gold threads and an alumina ceramic frame, wherein the surface of the AlSiC composite cooling substrate is plated with a copper film and a silver film sequentially; the LED light source module is packaged on the AlSiC composite cooling substrate; the alumina ceramic frame is arranged on the outer side of the LED light source module and adheres to the LED light source module; two copper-film electrodes are plated on the alumina ceramic frame and connected with a positive pole and a negative pole of the LED light source module through the gold threads respectively. According to the LED, thermal expansion coefficients of the AlSiC composite substrate and an LED chip material are matched, so that an LED chip which is packaged on the substrate is not prone to falling, and the service life of the LED is prolonged.

The invention discloses Fe-containing low-temperature sealing glass as well as preparation and use methods thereof. The Fe-containing low-temperature sealing glass is prepared from the following raw materials: B2O3, Bi2O3, ZnO and Fe2O3. Through the coordinating function of Bi2O3 and B2O3, the softening temperature of glass is reduced, and the low-temperature sealing is realized; by the adding of Fe2O3, the softening temperature of the sealing glass can be further reduced, and the refractive index of the glass can be stabilized; and furthermore, magnetic Fe3O4 generated inside can improve the automatic application efficiency of a sealing process. The preparation raw materials are simple and readily available; the process is stable, and the cost is reduced; and the Fe-containing low-temperature sealing glass is applicable to the field of photoelectric materials and other low-temperature precision packages.