Fabrication of a Thick Crystalline Al2O3 Coating with Insulation and High Thermal Conductivity via Anodic Oxidation and Subsequent Mic Arc Discharge Treatment
Round 1
Reviewer 1 Report
Recommendations for manuscript
“Fabrication of a thick crystalline Al2O3 coating with insulation and high thermal conductivity via anodic oxidation and subsequent mic arc discharge”
Song Wei, Jiang Bai-ling, Du Yu-zhou, JI Dong-dong, Wan Jing-jing
The manuscript should be accepted for publication. It covers an important topic about the improvement of electric properties of LED materials. LEDs are produced in billions every year.
Some minor improvement in the English language are necessary.
From the scientific point of view, I request to repeat the basics of exothermic and endothermic reactions.
During an exothermic reaction, heat is set free. During an endothermic reaction, heat is consumed. If heat is set free (exothermic reaction), the sign before the heat quantity “Q” or reaction enthalpy “DRH” needs to be negative.
Example:
C + 2O à CO2 ΔRH= -394 kJ/mol ΔRH: reaction enthalpy
Please consider this remarks in context with your equations (2), (3) and (4). Change your sentence in line 67 properly.
Also, please don´t use the symbol for “equal”: =
But use the arrow in the reactions equations: à
(see my Example above)
Table 1: Insulation and thermal conductivity of different materials.
Table 1: …..graphite sheets…
Figure 1: Crystalline phase…..
Figure 1: crystalline alumina
Line 72: …tank, in the effect due to the impact of electric….
Table 2: Micro-structuring…
Line 91: …of in chromic ….
Line 94: …, according to equation (4) (3)….?
Line 96: ….,and no interaction between them occurred. The direction of … (START NEW SENTENCE!)
Line 98: … strong interaction between them each other. The directions of bubble… (START NEW SENTENCE!).
Figure 2: The direction…
Line 117: …vol % or v/v % ?
Line 122: 50 mA cm-2 or 50 mA/cm2
Line 133: ..with a CuKa
Line 155: …was not conductive…
Line 165: 3.2 Phase strucuture of the coatings
Line 174: …was featured by…. is composed of amorphous alumina…
Line 176: crystallized peaks providing evidence that…
Line 178: in APD coatings and ….crystalline
Line 179: …alumin. and The crystal composition….
Lines 180-181: shown give evidence that with the increase of discharge time…the characteristic peak intensity is increased heighten.
Line 183: 3.3 Micro-morphology of the coatings
Line 184: For The crystal …
Line 185: discharge. The parameters … (START NEW SENTENCES!)
Line 186: …discharge process. The influence…(START NEW SENTENCE!)
Line 187: …coatings were are shown…
Line 189: Figure 5: Micro-morphology micro surface morphology
Line 191: …that under the condition if duty cycle was …
Line 193: pores and cracks….increased. It can …..that with the increased of growing current density,
Line 196: Figure 6: Micro-morphology micro surface morphology
Line 199: There were is similar regularity as of the influence of current ….
Line 201: into crystalline alumina….
Line 207: 3.4 Coating performance
Line 210: Table 3: The breakdown….
Table 3: Thermal coefficient conductivity
Table 4: Experimental factors …
Line 241: A crystalline alumina….
All the best
Your Reviewer
Author Response
Dear Editors and Reviewers:
Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Fabrication of a thick crystalline Al2O3 coating with insulation and high thermal conductivity via anodic oxidation and subsequent mic arc discharge treatment” (ID: 660205). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. Revised portion are marked in blue in the paper. The main corrections in the paper and the responds to the reviewer’s comments are as flowing:
Responds to the reviewer’s comments:
Reviewer #1:
The reviewer’s comment:1) the expression of equations (2), (3) and (4) are wrong.
Answer: We are very sorry for our incorrect writing. We have made correction according to the reviewer’s comment.
The reviewer’s comment: 2) the reviewer pointed out and helped to correct many grammatical or spell errors in the article.
Answer: We are very sorry for our incorrect writing. We have made correction according to the reviewer’s comments.
Thank you very much for your patience and careful review.
Reviewer 2 Report
The authors reported a 143 μm thick coating of crystalline Al2O3 by anodic oxidation and subsequent micro-arc discharge treatment in this study. I have several comments and suggestions to the authors, before acceptance of this paper:
[1] Reference for equation 1 missing
[2] Author's summarized many materials dielectric strength and thermal conductivity in Table 1 that are definitely taken somewhere from the literature, please cite them.
[3] Same comments for Table 2, proper citation missing.
[4] What are the key challenges authors face during the coating of the aforementioned materials? Please also add in the manuscript, it will help to a field expert to successfully reproduce this work.
Author Response
Dear Editors and Reviewers:
Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Fabrication of a thick crystalline Al2O3 coating with insulation and high thermal conductivity via anodic oxidation and subsequent mic arc discharge treatment” (ID: 660205). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. Revised portion are marked in blue in the paper. The main corrections in the paper and the responds to the reviewer’s comments are as flowing:
Responds to the reviewer’s comments:
The reviewer’s comment:1) Reference for equation (1) missing.
Answer: We are very sorry for our incorrect writing. We have made correction according to the reviewer’s comment.
The reviewer’s comment:2) Table 1 that are definitely taken somewhere from the literature, please cite them.
Answer:We have added references to the article according to the reviewer’s suggestion and update the references.
The reviewer’s comment:3) missing the proper cite on Table 2, add the references.
Answer:We have added references to the article according to the reviewer’s suggestion and update the references.
The reviewer’s comment:4) What are the key challenges authors face during the coating of the aforementioned materials? Please also add in the manuscript, it will help to a field expert to successfully reproduce this work.
Answer:We have re-written this part in introduction according to the reviewer’s suggestion.
Thank you very much for your patience and careful review.
Reviewer 3 Report
Good paper.
Author Response
Dear Editors and Reviewers:
Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Fabrication of a thick crystalline Al2O3 coating with insulation and high thermal conductivity via anodic oxidation and subsequent mic arc discharge treatment” (ID: 660205). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. Revised portion are marked in blue in the paper. The main corrections in the paper and the responds to the reviewer’s comments are as flowing:
Thank you very much for your patience and careful review.
Reviewer 4 Report
Abstract
The first two sentences within he abstract are repetitive and and could be rewritten as one sentence with a cohesive thought. Line 17; the word “was” should be removed from the sentence “the coating was consisted of amorphous and crystalline”
Introduction
Reference required for all the data presented in tables 1 and 2. Similar if Figures 1 and 2 are taken from the literature they should be properly cited.
The objective and significance of the study are not clearly articulated in the introduction section of the article.
Methodology
Under section 2.2
It would be worthwhile to use tables to show the experimental matrix with the different factors studied and the levels of each factor and the number of experiments completed and how many repeats. Also please indicate what was the stirring speed used for the electrolyte?
Result
The result section of the article was well written but lacking discussion and comparison to what currently exists with this technology.
Conclusion
The conclusions are not consistent with the objective of the paper though those were not clearly defined. The authors stated that “The thermal conductivity of the coating was 23.7 W/m•K, which was around 8 times to the insulation materials sold on the market. The coating can be applied in the heat dissipation of aluminium alloy, meeting the requirement of the high power and small volume part in the electronic industry, especially in LED development”. If this was the objective of the study it should be clearly outlined in the introduction.
References
The references used in the study are current and sufficiently cover the key findings in the literature related to this subject matter.
Author Response
Dear Editors and Reviewers:
Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Fabrication of a thick crystalline Al2O3 coating with insulation and high thermal conductivity via anodic oxidation and subsequent mic arc discharge treatment” (ID: 660205). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. Revised portion are marked in blue in the paper. The main corrections in the paper and the responds to the reviewer’s comments are as flowing:
The reviewer’s comment:1) The first two sentences within he abstract are repetitive and and could be rewritten as one sentence with a cohesive thought. Line 17; the word “was” should be removed from the sentence “the coating was consisted of amorphous and crystalline”.
Answer:We have re-written this part according to the reviewer’s suggestion and update the references.
The reviewer’s comment:2) Reference required for all the data presented in tables 1 and 2. Similar if Figures 1 and 2 are taken from the literature they should be properly cited.
Answer:We have added references to the article according to the reviewer’s suggestion and update the references.
The reviewer’s comment:3) The objective and significance of the study are not clearly articulated in the introduction section of the article.
Answer: We have re-written this part according to the reviewer’s suggestion.
The reviewer’s comment:4) It would be worthwhile to use tables to show the experimental matrix with the different factors studied and the levels of each factor and the number of experiments completed and how many repeats. Also please indicate what was the stirring speed used for the electrolyte?
Answer: As reviewer suggested that we have re-written this part. The parameters changed in the experiment were revised in the form of tables. The stirring speed used for the electrolyte was 60 r/min and have been added to the article. The repeat time of the experimental was 3 times and had been added to the article.
The reviewer’s comment:5) The result section of the article was well written but lacking discussion and comparison to what currently exists with this technology.
Answer: As suggested by the reviewers, we have added micro morphology and cross section image of anodic and MAO coatings in the result and discussion, the figure were updated.
The reviewer’s comment:6) The conclusions are not consistent with the objective of the paper.
Answer: We have re-written introduction and conclusion according to the reviewer’s suggestion.
Special thanks to you for your good comments.
Round 2
Reviewer 4 Report
The research article is well written and can now be accepted for publication.
