The stomatic structure of fireproof material has distinct effect to its creep function. Creep is to show material is mixed in high temperature constant below stress action, the plasticity that arises gradually along with time is out of shape. Stomatic existence can change the mechanical function of fireproof material and creep behaviour, material effect is as follows:
1.Air hole is right the influence mechanism of creep 1.1. Porosity tall porosity: Tall porosity can reduce the density of material and integral intensity, increase material to leave metabolic possibility in high temperature, quicken creep thereby. Low porosity: Low porosity means material more compact, have higher mechanical intensity and creep to fight force, creep is out of shape relatively lesser. 1.2. Stomatic size and distributinging air aperture: Big stomatic conference centers stress and become stress center a dot, bring about material easily local below high temperature stress be out of shape even burst, aggravate creep. Persnickety aperture: Persnickety aperture distributings equably relatively in material interior, conduce to alleviate stress concentration, reduce creep to be out of shape. Distributing equably: The stoma that distributings equably conduces to material dispersing in the stress below high temperature stress, process of slow down creep. Inhomogenous distributing: Inhomogenous the stoma that distributing may bring about stress concentration, quicken creep to be out of shape.
2.The incorporate that air hole affects to creep 2.1. Squirm gearshift leads tall porosity and large air hole: Porosity is mixed high the material with larger air hole, its creep rate normally faster, bear the weight of effectively because of what these stoma reduced material area and intensity. Low porosity and small air hole: Low porosity and stomatic and lesser material, its creep speed is relative slower, because material is more compact, can resist effectively be out of shape. 2.2. Creep phase is initiative creep (transient state creep) : In initiative phase, the stoma of material interior may be adjusted quickly and be out of shape, the creep of this one phase is out of shape faster. Stable state creep: In stable state phase, stomatic structure is relatively stable, creep is out of shape rate tends stable, but the material creep rate with larger air hole still taller. Quicken creep: Below high temperature and long-term stress action, air hole may expand further or join, bring about material interior structure to be destroyed further, quicken creep to be out of shape. 2.3. The influence of material life stoma to fatigue life: Air hole is more and distributing not all material, exhaustion of easy below environment of high temperature creep generation is destroyed, lower material life. The influence of ability of stomatic antagonism creep: The fireproof stuff with compact good sex fights creep ability strong, service life is long; And porosity is tall, stomatic distributing not all material fights creep ability to lose, life is briefer.
3.The method that improves air hole to be affected to creep 3.1. Optimize porosity to reduce porosity: Through raising the compact sex of material, reduce porosity, the denaturation fighting squirm that can improve data significantly can. Control stoma size and distributing: Use actor to change technology, control stoma size and distributing equably, avoid the generation of atmosphere aperture and stress concentration dot. 3.2. Add aggrandizement photograph to introduce di2 photograph grain: Wait for material of high melting point, wear-resisting like silicon of alumina, oxidation through introducing, di2 photograph can be formed in material interior, the denaturation fighting squirm that enhances material can. 3.3. Optimize firing craft is firing temperature and time: Reasonable control is firing temperature and time, ensure material interior structure is compact, the formation that reduces air hole and grow.
Adopt understanding and the stomatic structure that optimize fireproof material, can raise its effectively to fight creep function, prolong the service life that material leaves in high temperature environment.
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