Porous periclase-forsterite ceramic material with nanopore diameter and preparation method thereof

Abstract

The invention relates to a nano-aperture porous periclase-forsterite ceramic material and a preparation method thereof. The preparation method comprises the steps of sequentially heating magnesite fine powder to 600 to 800 DEG C and 800 to 1200 DEG C, keeping warm, and obtaining magnesium oxide powder with high porosity; putting 65 to 95 weight percent of magnesium oxide powder with high porosity into a vacuum mixer, pouring 0.1 to 18 weight percent of silica sol and 0.1 to 22 weight percent of microsilica into the vacuum mixer under 2.0kPa, and stirring to obtain a mixture; heating the mixture to 110 to 220 DEG C, keeping warm, mechanical pressing, and drying; then keeping warm at 800 to 1200 DEG C and 1400 to 1600 DEG C, and obtaining the nano-aperture porous periclase-forsterite ceramic material. The preparation method provided by the invention is low in preparation cost, and the prepared nano-aperture porous periclase-forsterite ceramic material has a nanoscale pore size, and has the characteristics of small volume density, low heat conduction coefficient, and high strength.

Description

technical field [0001] The invention belongs to the technical field of porous periclase-forsterite ceramic materials. In particular, it relates to a nano-pore porous periclase-forsterite ceramic material and a preparation method thereof. Background technique [0002] With the rapid development of social economy, energy and resources are gradually exhausted, and energy conservation and emission reduction have become one of the hot spots of global concern. Porous ceramics have low thermal conductivity and bulk density, and are one of the main types of heat-insulating refractory materials. They play a key role in energy saving and consumption reduction in high-temperature industries, and have received more and more attention from refractory researchers. Periclase-forsterite materials have excellent high-temperature mechanical properties and good chemical stability, and are widely used in high-temperature kilns such as glass kilns and cement kilns. The energy saving and consum...

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Problems solved by technology

[0003] At present, some progress has been made in the research on porous periclase-forsterite ceramic materials, such as the patented technology of "a periclase-olivine lightweight thermal insulation refractory material and its production method (CN1704384A)", using magnesite Powder, light-burned magnesia powder and silicon oxide powder are used as raw materials, and sawdust and coal powder are used as pore-forming agents. Although the lightweight periclase-forsterite refractory has its advantages, the disadvantage is that the pores of the product are relatively large. , and the pore former is completely burned to generate CO 2 , will cause secondary pollution; another example is to use forsterite sand, magnesia and magnesite as raw materials (Zheng Lianying, Wang Jiandong. Development of lightweight forsterite bricks for glass kilns. Refractories, 2012,49(2): 129~13l), prepared forsterite thermal insulation material, but this technology has high requirements for raw materials, the material has large pore diameter, extremely uneven pore size distribution, and low strength; another example is "a porous forsterite - Magnesite composite ceramic material and its preparation method (CN201410362125.9)" patent technology, using dolomite powder, silica powder and magnesite powder as raw materials, prepared a porous forsterite-feldspar ceramic material with high strength, However, the pore size of the ceramic material is large, the refractoriness is low, and the strength is low.