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Oxide catalyst for preparation of mullite ceramic whiskers

A technology of ceramic whiskers and mullite, applied in the field of oxide catalysts, can solve problems such as insufficient effect, and achieve the effect of simplifying the reaction process

Inactive Publication Date: 2017-05-10
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are some oxide catalysts such as La 2 o 3 ,Co 2 o 3 etc. but not as effective as AlF 3

Method used

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  • Oxide catalyst for preparation of mullite ceramic whiskers
  • Oxide catalyst for preparation of mullite ceramic whiskers
  • Oxide catalyst for preparation of mullite ceramic whiskers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0022] Implementation case 1: Preparation of mullite whiskers by adding molybdenum oxide into kaolin / aluminum hydroxide system

[0023] According to the chemical formula (3Al 2 o 3 2SiO2 2 ) 0.8 (MoO 3 ) 0.2 , quantitatively weigh kaolin, aluminum hydroxide and molybdenum oxide; put the weighed powder into a ball mill bottle, add absolute ethanol and zirconia ball mills to fully grind and mix on the ball mill; put the evenly mixed powder after grinding in an oven Drying at 100°C, and then calcining at 1200-1500°C for 2 hours in a muffle furnace to obtain mullite ceramic whiskers.

[0024] Figure 1 is the X-ray diffraction patterns of the samples calcined at different temperatures in this example, and comparing the patterns shows that after the addition of molybdenum oxide, the mullitization temperature decreases and the reaction process is obviously simplified.

[0025] figure 2 is the SEM morphology of mullite whiskers prepared at different calcination temperatures in ...

Embodiment example 2

[0027] Implementation Case 2: Preparation of mullite whiskers by adding molybdenum oxide to the quartz / aluminum hydroxide system

[0028] According to the chemical formula (3Al 2 o 3 2SiO2 2 ) 0.8 (MoO 3 ) 0.2 , quantitatively weigh quartz powder, aluminum hydroxide and molybdenum oxide; put the weighed powder into a ball mill bottle, add absolute ethanol and zirconia ball mills to fully grind and mix on the ball mill; place the evenly mixed powder after grinding Drying in an oven at 100°C, and then calcining at a high temperature of 1300-1500°C in a muffle furnace for 2 hours to obtain mullite ceramic whiskers.

Embodiment example 3

[0029] Implementation Case 3: Preparation of mullite whiskers by adding molybdenum oxide to solid-state reaction of silicon micropowder / aluminum hydroxide system

[0030] According to the chemical formula (3Al 2 o 3 2SiO2 2 ) 0.8 (MoO 3 ) 0.2 , quantitatively weigh silicon micropowder, aluminum hydroxide and molybdenum oxide; put the weighed powder into a ball mill bottle, add absolute ethanol and zirconia ball mills to fully grind and mix on the ball mill; place the evenly mixed powder after grinding Drying in an oven at 100°C, and then calcining at a high temperature of 1300-1500°C in a muffle furnace for 2 hours to obtain mullite ceramic whiskers.

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Abstract

The invention relates to the field of catalysts and ceramic whiskers and discloses a novel oxide catalyst for preparation of mullite (3Al2O3.2SiO2) ceramic whiskers. The oxide catalyst for promoting growth of the mullite ceramic whiskers is MoO3 or (NH4)2MoO4, and in application of the MoO3 or (NH4)2MoO4 as the catalyst for promoting growth of the mullite ceramic whiskers, a mole ratio of the catalyst to mullite is controlled to be 0-1, namely (3Al2O3.2SiO2)1-x(MoO3)x, wherein x refers to 0-0.5. By adoption of a solid phase method or a liquid phase method for synthesis of the mullite whiskers, the mullite whiskers uniform in morphology, 1-10micron in length range and 5-20 in length-diameter ratio range can be acquired through regulation of catalyst content and sintering temperature. By adoption of the catalyst for preparation of the mullite ceramic whiskers, low synthesis temperature, whisker morphologic uniformity, large length-diameter ratio, simplicity in preparation process, high reaction degree, freeness of aluminum oxide and quartz phase of prepared mullite and the like are realized.

Description

technical field [0001] The invention belongs to the field of catalysts and discloses an oxide catalyst used for preparing mullite whiskers. Background technique [0002] Ceramic whiskers are an important structural material. Whisker-reinforced composites will be greatly improved in mechanical properties (such as: fracture toughness, flexural strength, thermal shock resistance, etc.). Whisker materials such as silicon carbide, silicon nitride, and potassium titanate have been widely used in the preparation of composite materials with excellent performance. However, these whisker materials are easily oxidatively decomposed at high temperature, resulting in degradation of mechanical properties. Mullite material is Al 2 o 3 -SiO 2 The only stable crystalline material in the system, has become a candidate for advanced structural materials due to its high mechanical strength, good creep resistance, low thermal expansion coefficient, good chemical and high temperature stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/622C04B35/63
CPCC04B35/185C04B35/62231C04B35/6303C04B2235/3256
Inventor 朱志文危兆玲
Owner QILU UNIV OF TECH
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