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[ÇóÖú] Materials letters Éó¸åÒâ¼û»ØÀ´ÁË

Dear ....,

The reviewer(s) and editor have evaluated your manuscript . As you will see from the comments below and on http://ees.elsevier.com/mlblue/, moderate revision has been requested. Given that the requested revisions are moderate the new version is required within one month (30 days).

.........

I hope that you will find these comments to be of use to you and am looking forward to receiving your revision.

Thank you for submitting your work to this journal.



Kind regards,


Aldo Boccaccini
Editor-in-Chief
Materials Letters

..........................................................
Important note: If a reviewer has provided a review or other materials as attachments, those items will not be in this letter.  Please ensure therefore that you log on to the journal site and check if any attachments have been provided.  

COMMENTS FROM EDITORS AND REVIEWERS


Reviewer #1: Dear editor:
Thank you for inviting me to review this manuscript (.....). The author's investigation focus on the mullite based ceramics proppant fabricated method and its mechanic properties. Their research activity is more interesting and research results are not bad. Therefore, I feel that the paper merits publication in Materials Letter. However, several points are necessary for clarity before publication.
1. The author mentioned that they used the dynamic sintering method to fabricate the proppant. However, the author didn't give more detail description for dynamic sintering method. It is seemly more important to fabricate the low density mullite-based ceramics proppant. So, the author should supply the details for this method.
2. The Fig. 1 not clearly, it is better for author redraw the XRD patterns for the samples and give the reference PDF file of mullite. The caption for Fig. 1 has one mistake, the (a) bauxite calcined at 1300 C, should be calcined at 1200 C.
3. As shown as Fig. 3, the micrographs of proppant fracture section is not clear indicate the difference between two sintering temperature. So, it is better for author supplied the high magnification micrographs of proppant fracture section. The microstructure of proppant made from natural bauxite should be supplied too.
4. page 5, line 7, the author mentioned that: "the reaction between the glass phase and alumina to form secondary mullite is detrimental to the densification. For this reason, a higher breakage ration was observed in B-samples."  The conclusion is without enough experimental results support, such as phase analysis and microstructure analysis.
5. Page 6 and line9: the author mentioned that: "compared with A-samples 1355, the bigger pores were observed in A-specimens 1400 (sintering at 1400 C), which may be due to the expansion of gas in the pores in proppants with the increase of sintering temperature", however, here it is missing the direct experiment results too. What kinds gas will be produced at the temperature of 1400C?
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