Microstructure and Oxidation Behavior of Metal-Modified Mo-Si-B Alloys: A Review

Round 1

Reviewer 1 Report

The paper is an interesting dissertation on Oxidation behaviour of a Metal-Modified Mo- 2 Si-B Alloys taking into account the presence of phases

Just a few corrections must be done as suggested:

Row 32

industrial application. for example, ….

industrial application. For example, ….

Row 69

the silicon content is low, the researches of Mo-Si-B alloys are mostly concentrated

the silicon content is low, the researche of Mo-Si-B alloys is mostly concentrated

Row 88

After 100 h of oxidation, a dense and thick oxide scale formed on surface of the

After 100 h of oxidation, a dense and thick oxide scale formed on the surface of the

Row 101

annealing and laserl remelting, 

annealing and laser remelting, 

Row 123

enhance the antioxidation function of 123 the alloy.

enhance the antioxidant function of 123 the alloy.

Row 163

Figs. 5 (a-d) depicte the 

Figs. 5 (a-d) depict the 

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stable boroilicate scale,

stable borosilicate scale,

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alloy when the temperature below 1200 ℃. Especially, the oxidation speed of 

alloy when the temperature is below 1200 ℃. Especially, the oxidation speed of 

305 Mo-9Si-8B-1Zr (at.%) alloy was nearly three orders of magnitude slower than Mo-9Si-8B 306 sample, which revealed that the addition of Zr was instrumental in improving antioxida- 307 tion ability of Mo-9Si-8B composite, as depicted in Table 1. However, this beneficial effect 308 of Zr gradually disappeared when the temperature exceeded 1200 ℃. Fig. 10 (a) dis- 309 played the variation curve of the unit area mass with time of Mo-9Si-8B-(1Zr) samples 310 during oxidation at 1300 ℃. It could be observed that the oxidation trend of Row 316

of ZrO2 in the SiO2 scale occured, which

of ZrO2 in the SiO2 scale occurred, which

Row 404

rougher and existed a large number of holes, which maight be related to thermal chock 

rougher and existed a large number of holes, which might be related to thermal shock

Row 422

the presence of Mo3Si can neither enhances the

the presence of Mo3Si can neither enhance the

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resistance nor improves the fracture toughness. 

resistance nor improve the fracture toughness. 

Row 548

continuous protection films generated on the surface continuous protection films are generated on the surface 

Row 571

the addition of appropriate amount of Al 

the addition of an appropriate amount of Al  can also promote the formation of dense 571 

Author Response

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Reviewer 2 Report

This review briefly summarizes the strategies adopted to improve the antioxidation performance of Mo-Si-B alloys. It can be accepted after revision. Please find the suggestions below.

• In row 97 and 98 on Page 3, how long does it take to achieve the steady-state oxidation for Mo-14Si-28B? It is better to compare the oxidation behavior between Mo-14Si-28B and Mo-12.5Si-25B?
• How to define the low silicon content or high silicon content of Mo-Si-B alloys?
• In Fig.4, the difference of oxidation rate between Mo-12Si-17B and Mo-12Si-8.5B seems negligible. Is there an optimum amount of B to achieve the best performance? Or the more B, the better the oxidation resistance?
• For high silicon content Mo-Si-B alloys, does the B content affect the formation continuous silica film?
• In section, what is the intrinsical difference between these two methods to prepare Mo-Si-B alloys? It is just because of the initial density?
• Could you please briefly introduce the advantages of the addition of W, Al and Ti? I can’t understand the addition of these harmful elements without other merits.
• For the beneficial element Cr, how to control its amount to achieve the desired performance?

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

The author has modified this manuscript according to the comments. I suggest it be accepted.