而且，此前在太空尘埃中还未侦测到刚玉和方镁石。
Moreover, corundum and periclase have not been detected in space dust before.
方镁石的水化是轻烧氧化镁膨胀的理论基础。
The hydration of periclase in the magnesia is the theoretical basis for its expansion.
转炉冶炼过程中所形成的游离氧化钙和方镁石是影响钢渣长期不稳定性的主要因素。
The free calcium oxide and the periclase formed in the converter smelting process are primary factor affect the steel slag long-term unstable.
方镁石发育完善、晶体大、直接结合率高、结构致密、抗渣性强、高温体积稳定优越。
Periclase develops completely and its crystal body is big, with high combination rate, firm and tight structure, good refuses resistance and stable performance.
以电熔二钙砂、方镁石一氧化锆共晶材料为原料，制备出了再结合镁锆砖，并对制品的烧结性能进行了研究。
It produces rebonded magnizium-zirconium bricks which is made up of fused magnesite and fused eutectic MgO-Z_rO_2 materials. Then it analyzed the properties of samples after sintering.
通过全面检测和分析，指出混凝土骨料中含有的方镁石发生水化反应所引起的体积膨胀，是混凝土构件胀裂的根本原因。
Through some macro and micro inspections, the cause is found out of the volume expansion due to the hydration of magnesia in concrete aggregates.
试验表明，加锆改性尖晶石砖的使用情况较直接结合镁铬砖差，而加铬方镁石复合尖晶石砖(LYC砖)的使用效果好于直接结合镁铬砖。
And the test shows that the using condition of modified zirconium spinel brick is more bad than direct-bonded magnesia brick but as for chrome periclase-spinel compound brick (LYC) it is better.
试验表明，加锆改性尖晶石砖的使用情况较直接结合镁铬砖差，而加铬方镁石复合尖晶石砖(LYC砖)的使用效果好于直接结合镁铬砖。
And the test shows that the using condition of modified zirconium spinel brick is more bad than direct-bonded magnesia brick but as for chrome periclase-spinel compound brick (LYC) it is better.
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