纯原料 meaning in English

pure raw materials
purerawmaterials

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。