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Low cost process of synthesizing sialon ceramic powder

A ceramic powder, low-cost technology, applied in the field of low-cost synthesis of sialon ceramic powder, can solve the problems of high energy consumption, energy consumption, low output, etc., and achieve simple synthesis equipment, easy large-scale production, and high reactivity. Effect

Inactive Publication Date: 2002-05-22
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, literature reports and our own research results show that the Sialon powder synthesized by the carbothermal reduction nitriding process has disadvantages such as long cycle, high energy consumption, low yield, and incomplete reaction.
Because the nitriding reaction is kinetically difficult and the yield is very low, it usually takes a few days for several kilograms of powder, which not only consumes a lot of energy, but also indirectly causes environmental pollution.

Method used

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  • Low cost process of synthesizing sialon ceramic powder
  • Low cost process of synthesizing sialon ceramic powder
  • Low cost process of synthesizing sialon ceramic powder

Examples

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Effect test

Embodiment 1

[0026] Using blast furnace slag, metal silicon powder and aluminum powder as raw materials in a steel plant, and adding a small amount of Si 3 N 4 and AlN as seeds, considering the chemical composition of the slag (Table 1), the composition of α-Sialon is Ca 0.71 Mg 0.23 Si 9.18 Al 2.82 o 0.94 N 15.06 design. The raw materials prepared according to this composition are ball milled for 24 hours in a corundum cylinder with silicon nitride balls as the medium. After mixing and drying, put it into a self-propagating furnace for synthesis, and the synthesis atmosphere is high-pressure N 2gas. The synthesized powder is determined to be single-phase α-Sialon by XRD, and is (Ca, Mg)-α-Sialon by EDS. The XRD pattern and micromorphological photos of the synthesized powder are as follows figure 1 and figure 2 shown. After ball milling, the median particle size of the powder is between 1 and 2 μm, which can be directly sintered without pressure and kept for 2 hours, with a den...

Embodiment 2

[0030] Using the same process as in Example 1, just use the (Ca, Mg)-α-Sialon powder synthesized in Example 1 instead of Si 3 N 4 As the seed crystal together with AlN, blast furnace slag, metal silicon powder and aluminum powder are still used as raw materials, according to Ca 0.71 Mg 0.23 Si 9.18 al 2.82 o 0.94 N 15.06 Design the final α-Sialon composition. The synthesized powder is still (Ca, Mg)-α-Sialon after XRD and EDS determination.

Embodiment 3

[0032] Adopt the same process of embodiment 1, just change to limestone powder (CaCO 3 >98wt%), metal silicon powder, aluminum powder and a small amount of Si 3 N 4 With AIN as raw material, the composition design of Ca-α-Sialon changes in the whole Ca-α-Sialon phase region, and single-phase Ca-α-Sialon can be synthesized by high temperature self-propagating process. Specifically, by Ca x Si 12-3x al 3x o x N 16-x Component design, just choose any point in 0.4≤x<1.4.

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Abstract

The method for synthesizing sialon ceramic powder material by low cost is characterized by using metallurgical furnace slag or limestone or fly ash industrial waste material or cheap natural mineral as raw material, adding metal silicon powder, aluminium powder and partial crystal seed through the processes of ball grinding, drying, high-temp. self spreading and other treatment to obtain the invented single-phase alpha-sialon powder material. Said powder material possesses excellent sintering property, can be sintered without pressure at 1600-1800 deg.C, its density is up to 3.07g / se.cm, hardness is 15.53 GPa, and its toughness is 4.72 Mpa.m(1 / 2), as compared with Al2O3, ZrO2 and SiC ceramics its erosion resistance is excellent.

Description

technical field [0001] The invention relates to a low-cost method for synthesizing sialon ceramic powder. More precisely, it provides a method for synthesizing high-purity, easily sinterable α-Sialon ceramic powder by using metallurgical slag or limestone, metal silicon powder and metal aluminum powder as main raw materials through a high-temperature self-propagating process , the α-Sialon ceramic powder synthesized by this method is used as raw material, and the pressureless sintered sample has good mechanical properties, and its erosion resistance is much higher than that of alumina and zirconia ceramics. belongs to Si 3 N 4 The field of preparation of base ceramic materials. Background technique [0002] Sialon is Si 3 N 4 The solid solution was first proposed by K.H.Jack et al. in 1972. Si 3 N 4 With α-Si 3 N 4 and β-Si 3 N 4 The two variants and their solid solutions with the same structure are called α-Sialon and β-Sialon respectively. and currently common...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622
Inventor 陈卫武王佩玲程一兵张宝林庄汉锐
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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