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Preparation method for rare earth niobate high-temperature ceramics

A technology of high-temperature ceramics and niobate, applied in the field of high-temperature materials, can solve the problems of coating failure, poor phase stability and high thermal conductivity, and achieve the effects of good high-temperature thermal stability, low impurity content and low preparation cost

Inactive Publication Date: 2016-12-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used thermal barrier coating material is 7-8YSZ, but the problem is that when the operating temperature of YSZ exceeds 1200 ° C, the phase stability is poor, it is easy to sinter, the thermal conductivity is high, and the metal substrate is easily oxidized, resulting in the coating Ineffective, it is difficult to meet the needs of further increase in turbine inlet temperature
Chinese patent CN 101182206A reports the use of CaF 2 Synthesis of yttrium niobate (YNbO 4 ) The method of microwave dielectric functional ceramics, although the process is simple, economical and reasonable, but there will be a certain amount of impurity in one-time sintering, adding the co-solvent CaF 2 Certain impurities will also be introduced, and yttrium niobate that has not been pre-calcined is not dense and contains some heterogeneous reactions

Method used

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  • Preparation method for rare earth niobate high-temperature ceramics
  • Preparation method for rare earth niobate high-temperature ceramics
  • Preparation method for rare earth niobate high-temperature ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A new type of high temperature resistance, anti-oxidation, anti-wear yttrium niobate (YNbO 4 ) ceramic material and preparation method thereof, specifically comprising the following steps:

[0030] Weigh 12.7984g of yttrium oxide and 15.0654g of niobium oxide, mix them in absolute ethanol, put them into a planetary ball mill (the speed of the ball mill is 300 r / min, and the ball milling time is 180 min), mix 0.2 mL of polyvinyl alcohol The hydrogel was added to the mixture A that had just been ball-milled and ball-milled again for 60 min, and the mass percent concentration of polyvinyl alcohol hydrogel was 5%; then the ball-milled solution was dried at 60°C for 24 hours and passed through a 300-mesh sieve , and then pressed into a mold (holding pressure 8 MPa, holding time 60 min), after pressing, it was pre-fired at 800 °C for 10 hours.

[0031] After calcining the raw materials for the first time, grind the mixture evenly, dissolve it again in absolute ethanol, and p...

Embodiment 2

[0034] A new type of high temperature resistance, anti-oxidation, anti-wear neodymium niobate (NdNbO 4 ) ceramic material and preparation method thereof, specifically comprising the following steps:

[0035] Weigh 19.0715g of neodymium oxide and 15.0654g of niobium oxide, mix them in absolute ethanol, put them into a planetary ball mill (the speed of the ball mill is 320 r / min, and the ball milling time is 170 min), mix 0.2mL of polyvinyl alcohol The hydrogel was added to the mixture A that had just been ball milled and ball milled again for 50 min. The mass percent concentration of polyvinyl alcohol hydrogel was 6%; then the ball milled solution was dried at 64 °C for 22 hours and passed through a 300 mesh sieve , and then pressed into a mold (holding pressure 9 MPa, holding time 55 min), after pressing, it was pre-fired at 850 °C for 9 hours.

[0036]After the raw materials were calcined for the first time, the mixture was ground evenly, dissolved in absolute ethanol again,...

Embodiment 3

[0038] A new type of high temperature resistance, anti-oxidation, anti-wear samarium niobate (SmNbO) described in this embodiment 4 ) ceramic material and preparation method thereof, specifically comprising the following steps:

[0039] Weigh 19.7646g of samarium oxide and 15.0654g of niobium oxide, mix them in absolute ethanol, put them into a planetary ball mill (the speed of the ball mill is 340 r / min, and the ball milling time is 160 min), mix 0.2mL polyvinyl alcohol The hydrogel was added to the mixture A that had just been ball-milled and ball-milled again for 45 min, and the mass percent concentration of polyvinyl alcohol hydrogel was 7%; then the ball-milled solution was dried at 66°C for 20 hours and passed through a 300-mesh sieve , and then pressed into a mold (holding pressure 10 MPa, holding time 50 min), after pressing, it was pre-fired at 900 °C for 8 hours.

[0040] After calcining the raw materials for the first time, grind the mixture evenly, dissolve it aga...

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Abstract

The invention discloses a preparation method for rare earth niobate high-temperature ceramics RENbO4 (RE=Y, Nd, Sm, Eu, Gd, Dy, Er and Yb). The adopted raw materials include rare earth oxide and niobium oxide. The method comprises the following steps: weighting the raw materials in proportion; putting the weighted raw materials and absolute ethyl alcohol into a ball-milling tank, mixing, sealing and then putting on a planetary ball mill for milling, and uniformly mixing; adding binder, namely, polyvinyl alcohol hydrogel, into the milled mixture, and then milling for a period of time, and uniformly mixing; drying and screening the mixed powder and then putting into a mold for compacting; pre-sintering; cooling, taking out the sample after pre-sintering, grinding, milling, adding polyvinyl alcohol hydrogel, and then milling, drying and screening; putting the powder after screening in the mold and compacting, and then sintering for the second time. The preparation method has the advantages of high technical purity, low impurity content, low product preparation cost and suitability for bath production. The targeted product is expected to become a novel high temperature-resisting, antioxidant and abrasion-resisting ceramic material.

Description

Technical field [0001] The invention belongs to the technical field of high-temperature materials, and specifically relates to a new type of high-temperature-resistant, oxidation-resistant and wear-resistant lanthanide rare earth niobate ceramic material and its preparation method. Background technique [0002] Thermal barrier coating is mainly used in the aerospace engine industry. It has good heat insulation effect, high temperature oxidation resistance, wear resistance and corrosion resistance. It is one of the most advanced high temperature protective coatings at present and is also the surface protective coating with the best application prospects. One of the layers. The currently used thermal barrier coating material is 7-8YSZ, but the problem is that when the service temperature of YSZ exceeds 1200°C, the phase stability is very poor, it is easy to sinter, the thermal conductivity is high, and the metal substrate is easily oxidized, resulting in coating Failure, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/50C04B35/634C04B35/64C04B35/626
CPCC04B35/495C04B35/50C04B35/622C04B35/62615C04B35/63416C04B35/64C04B2235/661C04B2235/96C04B2235/9607C04B2235/9684
Inventor 冯晶汪俊周荣蒋业华
Owner KUNMING UNIV OF SCI & TECH
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