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mbj2004

捐助贵宾 (小有名气)

莘莘木虫

应助: 0 (幼儿园)
金币: 2301.9
散金: 92
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帖子: 296
在线: 911.8小时
虫号: 663695
注册: 2008-11-27
专业: 零件成形制造

[求助] 请帮助看看如何回答这些大修问题？

下面是其中一个审稿人的全部意见，问题：
１.第一段是否不须做出恢复？
２.第二段分几个层次回答？（斜体部分）

Reviewer #2: The authors used CVD to deposit amorphous carbon films (1-2 m thick) on diamond grits which were used to make brazed diamond tools by induction melting a NiCrBSi braze filler. The sharp and faceted diamond grits stood proud of the filler alloy after brazing and the reaction-formed discontinuous carbides were distributed on the brazed diamond surface. These carbides were noted to be beneficial to "enhance the bonding strength (not directly measured!) of the filler alloy and diamond grits". Grinding tests revealed more extensive whole grain fracture of the deposited diamond grits than pull-out.
The authors mention that active element Cr in the NiCrBSi braze reacts with the carbon to form carbides such as Cr3C2 or Cr7C3. The discussion of the reaction is relatively weak. I would expect that once a thin film of chromium carbide has formed on the carbon surface, through which Cr and C diffuse (possibly along grain boundaries), reaction and conversion together with volumetric changes would continue. What is the expansion mismatch between the reaction-formed carbides and diamond? Will there be volumetric contraction or expansion (and spalling-off of freshly formed carbides)? The CTE of Cr3C2 is 10.3 x 10-6/K and the CTE of carbon and diamond is in the range of 0.5 x 10-6/K to 1.2 x 10-6/K. Such a large CTE mismatch together with the very high modulus and negligible plasticity of the carbides and the diamond will inevitably lead to large thermal stresses during brazing. Additionally, Cr3C2 has poor thermal shock resistance and its formation, although beneficial for wetting and bonding, would be undesirable for the intended application. Can the author rule out the formation of silicon carbide and/or boron carbide from the reaction of Si and B in braze with diamond on the basis of Gibb's free energy change? The diffusion coefficient of boron is about three times greater than that of the Cr and Si and could this lead to reaction and boride formation?
On page 6, under Results and Discussion, the paragraph starting with the sentence "HFCVD is one of the earlier successful methods of producing amorphous carbon.." and the next three paragraphs read just like the literature survey; these paragraphs should be deleted as they do not contribute to the discussion and add body without adding scientific insight. There are statements throughout (e.g., "The surface of the diamond grits used as substrate exhibits many kinds of dislocation shapes."

for which there is no evidential support provided.
It is not clear what the authors are trying to show in Fig. 4. Put markers to identify phases and features that are relevant to the discussion.
The writing is generally acceptable; however, minor but irritating mistakes of English grammar were found. Examples:
"In recent years, single-player brazed diamond grinding tools that offer several benefits such as high bonding strength between." single player or single-layer?
"Induction heating is characterized by local rapid heating. Induction brazing of diamond grits has been gradually attention in the tool industry to shorten brazing time."
The authors should enlist the aid of a colleague conversant with English writing to help them proofread the narrative presentation.

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小木虫，心灵的家园。

1楼 2011-11-16 21:28:00

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

mbj2004

捐助贵宾 (小有名气)

莘莘木虫

应助: 0 (幼儿园)
金币: 2301.9
散金: 92
红花: 2
帖子: 296
在线: 911.8小时
虫号: 663695
注册: 2008-11-27
专业: 零件成形制造

★
seapass(金币+1): 鼓励发帖交流！但您的求助帖不符合SEPI的要求！谢谢！ 2011-11-17 12:21:53

引用回帖:

1楼: Originally posted by mbj2004 at 2011-11-16 21:28:00:
下面是其中一个审稿人的全部意见，问题：
１.第一段是否不须做出恢复？
２.第二段分几个层次回答？（斜体部分）

Reviewer #2: The authors used CVD to deposit amorphous carbon films (1-2 <mu>m th ...

十分感谢各位同仁百忙之中能抽出时间关照我问题！上帖忘了感谢，特补上．
该审稿人的审稿意见原格式就是这个样子，真不知该分几个问题逐一回答？