44results about How to "Good phase stability at high temperature" patented technology

The invention provides a preparation method of a thermal carrier coating and the thermal barrier coating prepared through the preparation method. According to the preparation method, a precursor solution prepared from zircon salt and ytterbium salt is used as a spraying raw material, and in a liquid-phase plasma spraying device, the precursor solution is delivered into plasma jet flow through a two-flow atomization nozzle and then deposits on a matrix to form the thermal barrier coating provided with evenly-distributed pores and vertical crack structures. The thermal barrier coating prepared through the method is a nano-structure thermal barrier coating provided with vertically-cracked columnar crystals and the evenly-distributed pores. According to the preparation method of the thermal carrier coating and the thermal barrier coating prepared through the preparation method, the precursor solution replaces agglomeration powder to serve as the raw material, so that a complex traditionalraw material pelletizing process based atmosphere plasma spraying is greatly simplified, the production efficiency is improved, and the cost is reduced. The structure of the coating is controllable, and the thermal barrier coating prepared through the preparation method is of a nano-structure and is provided with vertical crack structures. A ceramic material YbSZ has high phase stability and low thermal conductivity.

The invention discloses a preparation method of a tetravalent ion-doped toughened hafnium oxide-based high-temperature thermal protection material, and the product obtained therethrough. The preparedthermal protection material is a yttrium oxide and tetravalent oxide co-doped hafnium oxide material system, the chemical composition of the material is (Hf1-xLnx)0.92Y0.08O1.96, and Ln is selected from Ti, Sn or Th. The material has the characteristics of high phase stability, high toughness and low thermal conductivity high fracture toughness can be guaranteed when the material is used as a thermal protection material, and when x is 0.25, the highest fracture toughness can reach 3.62 MPa.m<1/2>, meanwhile, the low thermal conductivity of about 1.8 W/(m*K) is kept at 1200 DEG C, and phase change does not occur within 1400 DEG C. The yttrium oxide and titanium oxide co-doped stable hafnium oxide material has good high-temperature phase stability, and can be used for designing and preparinghigh-temperature thermal protection material with the use temperature of 1400 DEG C or above.

The invention discloses Sm-Eu-Gd trirare earth ion tantalate as well as a preparation method and application thereof. The chemical general formula of the Sm-Eu-Gd trirare earth ion tantalate is SmaEubGdcTaO7, wherein a+b+c is equal to 3, and a,b,c is equal to 0.8 to 1.2. The preparation method of the Sm-Eu-Gd trirare earth ion tantalate comprises the following steps: (1) weighing europium chloride, gadolinium nitrate, samarium nitrate and tantalum oxalate according to a stoichiometric ratio, mechanically mixing with a set amount of citric acid under heat preservation conditions, adding a concentrated ammonium hydroxide neutralizing solution in a mixing process, and then mechanically mixing under the heat preservation conditions to promote the process of reaction; (2) drying the obtained solution, and then calcining at high temperature to remove carbon impurities to obtain Sm-Eu-Gd trirare earth ion tantalate powder. The Sm-Eu-Gd trirare earth ion tantalate is high in high-temperature thermal stability and low in thermal conductivity coefficient, and can be applied as a thermal barrier coating material.

The invention relates to a preparation method of a thermal barrier coating with an interlayer pore structure. The preparation method comprises the following steps of performing heat treatment on the La2o3, Ceo2, Zro2 powders; mixing the heat-treated powders with a dispersing agent according to a ratio, adding deionized water and carrying out ball milling to obtain slurry; the molar ratio of La2o3,Ceo2, Zro2 powders are 0.5:(1-X): X, wherein X is greater than or equal to 0 and less than or equal to 0.8; drying the ball-milled slurry and carrying out heat treatment to form a phase, so as to obtain the phase-forming powders; mixing the phase-forming powders with deionized water and the dispersing agent for ball milling to obtain a suspension liquid; taking the suspension liquid as a raw material, and spraying the suspension liquid on a matrix material by adopting a suspension liquid plasma spraying method. The La2 (Ce1-xZrx) 2O7 coating prepared by adopting the suspension liquid plasma spraying method has excellent high-temperature phase stability, the prepared coating has a uniform interlayer pore structure, the structure is beneficial to reducing the heat conductivity of the coating and prolonging the heat cycle life of the coating.

The invention discloses Eu-Gd-Dy trirare earth ion tantalate and a preparation method and an application thereof, the Eu-Gd-Dy trirare earth ion tantalate has the chemical general formula of EuaGdbDycTaO7, wherein a+b+c=3, and a, b and c is 0.8-1.2. The preparation method comprises the following steps: 1) according to the stoichiometric ratio, weighing europium chloride, gadolinium nitrate, dysprosium nitrate and tantalum oxalate, mechanically mixing with citric acid with a set amount under a heat-retaining condition, adding strong aqua ammonia in the mixing process to neutralize the solution,and then mechanically mixing to promote the process of the reaction under a heat-retaining condition; and 2) drying the obtained solution, then calcining at high temperature to remove carbon impurities, and thus obtaining an Eu-Gd-Dy trirare earth ion tantalate powder. The Eu-Gd-Dy trirare earth ion tantalate has the advantages of good high temperature thermal stability and low thermal conductivity coefficient, and can be used as a thermal barrier coating material.

The invention discloses a Sm-Eu-Dy tri-rare-earth ion tantalate and a preparation method and application thereof. The general chemical formula of the Sm-Eu-Dy tri-rare-earth ion tantalate is SmEuDy<c>TaO<7>, wherein the a, b and c meet the relationship of a+b+c=3 and are separately in a range of 0.8-1.2. The preparation method comprises the following steps: (1) weighing europium chloride, samarium nitrate, dysprosium nitrate and tantalum oxalate according to a stoichiometric ratio, performing mechanical mixing with citric acid with a preset amount under a heat preservation condition, adding a concentrated ammonia water neutralization solution during the mixing process, and carrying out mechanical mixing to promote a chemical reaction under a heat preservation condition; and (2) drying the obtained solution, and then carrying out calcination at a high temperature to remove carbon impurities to obtain the Sm-Eu-Dy tri-rare-earth ion tantalate powder. The Sm-Eu-Dy tri-rare-earth iontantalate has good high-temperature thermal stability and low thermal conductivity, and can be used as a thermal barrier coating material.