| 1. | In early 1993 , dr . peter put forward an idea that it is possible to substitute gahnite for mullite used as the raw material for ceramic cup of blast furnace
早在1993年， peter博士曾提出锌铝尖晶石有可能作为制备高炉陶瓷杯的原料以替代莫来石。 |
| 2. | Study on the synthesis of corundum - mullite - gahnite multiphase materials by one - step sintering process using kaolinite showed that corundum - mullite - gahnite multiphase materials with the apparent porosity less than 5 % can be obtained through sintering at 1700 for 3h
在1700下保温3h ，能够一步合成出显气孔率在5以下的刚玉?莫来石?锌铝尖晶石复相材料，各物相间结合紧密，发育较好。 |
| 3. | The formation of new phase such as mullite and gahnite by solid - phase reaction in multiphase materials can benefit the sintering of materials at 1700 , decreased apparent porosity to less than 5 % . reducing atmosphere inhibited the synthesis of mullite and gahnite , played a negative role in the densification of multiphase materials
固相反应生成的锌铝尖晶石和莫来石具有较高的活性，使复相材料在1700烧后显示出更好的烧结性能，其显气孔率降低到5以下；还原性气氛阻碍了莫来石和锌铝尖晶石的生成，不利于复相材料的烧结和致密化。 |
| 4. | Study on the synthesis of corundum - mullite - gahnite multiphase materials by two - step sintering process using kaolinite as raw material showed that impurities introduced by kaolinite mainly increased the liquid amount at high temperature , which can assist sintering of specimen . the experiment results indicated that the samples with lower gahnite content had better sinterability than others . however , if the gahnite content was relative high , the promoting effect on sinterability caused by kaolinite was not significant
采用天然原料高岭土二步煅烧合成刚玉?莫来石?锌铝尖晶石复相材料研究发现：天然原料中带入的杂质主要是增加液相量，促进高温下试样的烧结；当尖晶石含量较低时，试样在1300保温2h时，在1600烧后试样烧结性能相比之下较好；而当锌铝尖晶石含量较高时，天然料对试样的促烧作用不是非常明显。 |
| 5. | Based on orthogonal designed experiment , the synthesis of corundum - mullite - gahnite multiphase materials by two - step sintering process showed that the light fired temperature and holding time mostly influenced the apparent porosity of the multiphase materials . further study on the light firing time indicated that at the light firing temperature of 1300 and died fire temperature of 1600 for 3h , the optimal light fired time was about 1h
二次煅烧及正交实验合成复相材料研究表明：轻烧温度和轻烧时间对复相材料的显气孔率影响显著；通过轻烧保温时间的进一步研究表明：含刚玉、莫来石、锌铝尖晶石的复相材料，在轻烧温度为1300 、终烧条件为1600下保温3h时，最佳的保温时间为1小时左右。 |
| 6. | Based on the review , the main objectives of this work had been determined . the thermodynamic analysis indicated that corundum - mullite - gahnite multiphase materials can be synthesized . the investigation of x - ray diffraction ( xrd ) and scan electron microscope ( sem ) proved the validity of thermodynamics research
通过对al _ 2o _ 3 - sio _ 2 - zno体系相关反应热力学的计算表明能够合成出刚玉?莫来石?锌铝尖晶石复相材料， x ?射线衍射( xrd )和扫描电子显微镜( sem )的研究证实了热力学计算的可靠性。 |
| 7. | Non - isothermal kinetics study showed that the mechanism of zno - al2o3 solid - phase reaction was well fitted with cater ' s equation . active energy of solid - phase reaction derived from the experiments by the methods of ozawa equation avoiding the function of reaction mechanism was about 63 . 48kj / mol , which was almost the same value of active energy deduced from cater ' s equation
非恒温动力学分析表明：锌铝尖晶石的固相反应机理符合卡特方程；采用卡特方程的机理函数和避开反应机理函数的ozawa方程得出的活化能分别为64 . 39kj mol和63 . 48kj mol ，两值十分接近。 |
| 8. | It is well known that there exists a composition triangle in phase diagram for ternary system of al2o3 - sio2 - zno , responding to three high temperature phases of corundum , mullite and gahnite . through control of chemical composition and technical process , it is possible to synthesize corundum - mullite - gahnite multiphase materials theoretically
在al _ 2o _ 3 - sio _ 2 - zno三元系中，存在着一个对应刚玉、莫来石和锌铝尖晶石三物相的分三角形，在适当的配料组成和工艺条件下，是能够合成出刚玉?莫来石?锌铝尖晶石复相材料。 |
| 9. | Study on the synthesis of corundum - mullite - gahnite multiphase materials by one - step sintering process using high purity raw materials showed that the more the content of gahnite in multiphase materials , the high the volume expansion would be introduced in the system , which resulted in the sintering difficulty of the multiphase materials . while the content of gahnite was controlled about 30wt % and the content of mullite was about 70wt % , the densified multiphase materials can be obtained after fired at 1600 or 1700
采用高纯原料一步合成刚玉?莫来石?锌铝尖晶石复相材料研究表明：复相材料中锌铝尖晶石含量越高，则合成锌铝尖晶石时产生的体积膨胀越大，烧结性也就越差；当锌铝尖晶石含量为30wt ，莫来石含量较高为70wt左右时，在1600或1700烧后都能得到显微结构较为致密的复相材料。 |
