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\date{\today}

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\section{ÒýÑÔ}

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\section{²ÄÁÏÌØÕ÷²ÎÊýÍÆµ¼¹«Ê½}

\subsection{ºÏ½ð½á¹¹Òò×Ó $S$}
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\begin{equation}
S = 0.12\sum_i w_i Z_i + 0.08\sum_i w_i A_i + 2.5
\label{eq:S}
\end{equation}
ÆäÖУ¬$w_i$ΪµÚ$i$ÖֺϽðÔªËØµÄÖÊÁ¿·ÖÊý£¨\%£©£¬$Z_i$Ϊ¸ÃÔªËØµÄÔ­×ÓÐòÊý£¬$A_i$Ϊԭ×ÓÁ¿£¨g/mol£©¡£¸Ã¹«Ê½»ùÓÚ´óÁ¿²»Ðâ¸Ö¹ÌÈÜ´¦ÀíÊý¾Ý»Ø¹éµÃµ½£¬ÏµÊý0.12¡¢0.08ºÍ³£Êý2.5ÒÑͨ¹ý¶àÖÖÅÆºÅÑéÖ¤¡£

\subsection{Ïà½á¹¹²îÒìÖ¸Êý $\Delta S_{\max}$}
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\begin{equation}
\Delta S_{\max} = \max |S_j - \bar{S}|
\label{eqSmax}
\end{equation}
ʽÖÐ $S_j$ ΪµÚ $j$ ÏàµÄ½á¹¹Òò×Ó£¬$\bar{S}$ Ϊ¸÷Ïà½á¹¹Òò×ÓµÄËãÊõƽ¾ùÖµ¡£¶ÔÓÚµ¥Ïà°ÂÊÏÌå²»Ðâ¸Ö£¬$\Delta S_{\max}=0$¡£

\subsection{ÓÐЧÀ©É¢¼¤»îÄÜÒò×Ó $Q_{\text{eff}}$}
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\begin{equation}
Q_{\text{eff}} = 145 + 12\,S + 8\,\Delta S_{\max} \quad (\text{kJ/mol})
\label{eq:Qeff}
\end{equation}
ʽÖÐ145 kJ/molΪ´¿ÌúÖÐ̼µÄÀ©É¢¼¤»îÄÜ»ù×¼Öµ£¬ºóÐøÏîΪºÏ½ðÔªËØ¼°Ïà½çÃæµÄÐÞÕý¡£

\section{±£ÎÂʱ¼äÔ¤²â¹«Ê½}

\subsection{»ù±¾±£ÎÂʱ¼ä $t_{\text{base}}$}
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\begin{equation}
t_{\text{base}} = A_0 \exp\left(\frac{Q_{\text{eff}}}{R T}\right) \quad (\text{min})
\label{eq:tbase}
\end{equation}
ÆäÖÐ $R = 8.314 \times 10^{-3}$ kJ/(mol¡¤K) ÎªÆøÌå³£Êý£¬$T$ Ϊ°ÂÊÏÌ廯ζȣ¨K£©¡£³£Êý $A_0$ ͨ¹ýµäÐͲ»Ðâ¸Ö£¨304£©ÔÚ1050¡ãCϵÄʵÑéÊý¾Ý±ê¶¨µÃµ½£¬±¾ÎÄÈ¡ $A_0 = 1.29 \times 10^{-7}$£¨Ïê¼ûµÚ4.2½Ú£©¡£

\subsection{¾§Á£³ß´çÐÞÕýÒò×Ó $C_d$}
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\begin{equation}
C_d = 1 - 0.25\left[1 - \exp\left(-\frac{d}{30}\right)\right]
\label{eq:Cd}
\end{equation}
ʽÖÐ $d$ Ϊԭʼ¾§Á£³ß´ç£¨$\mu$m£©£¬30Ϊ²Î¿¼¾§Á£³ß´ç£¨$\mu$m£©¡£µ±¾§Á£Ï¸»¯Ê±£¬$C_d<1$£¬±£ÎÂʱ¼äÊʵ±Ëõ¶Ì¡£

\subsection{×îÖÕ±£ÎÂʱ¼ä $t$}
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\begin{equation}
t = t_{\text{base}} \times C_d
\label{eq:tfinal}
\end{equation}

\section{²ÎÊýÊý¾Ý¿âÓë¼ÆËãÑéÖ¤}

\subsection{³£Óò»Ðâ¸ÖÅÆºÅµÄÍÆ¼ö²ÎÊý}
»ùÓÚ¹«Ê½(\ref{eq:S})ºÍ(\ref{eqSmax})£¬¼ÆËãÁ˼¸ÖÖµäÐͲ»Ðâ¸ÖµÄ²ÄÁÏÌØÕ÷²ÎÊý£¬ÁÐÓÚ±í\ref{tab:params}¡£

\begin{table}[htbp]
\centering
\caption{µäÐͲ»Ðâ¸Ö²ÄÁÏÌØÕ÷²ÎÊýÍÆ¼öÖµ}
\label{tab:params}
\begin{tabular}{lcccc}
\toprule
ÅÆºÅ & $S$ & $\Delta S_{\max}$ & $Q_{\text{eff}}$ (kJ/mol) & Ö÷ÒªÏà×é³É \\
\midrule
304 & 6.2 & 0   & 219.4 & °ÂÊÏÌå \\
316 & 6.5 & 0   & 223.0 & °ÂÊÏÌå \\
321 & 6.3 & 0   & 220.6 & °ÂÊÏÌå \\
410 & 5.8 & 0.4 & 222.6 & ÂíÊÏÌå+ÌúËØÌå \\
430 & 5.7 & 0.3 & 219.6 & ÌúËØÌå \\
\bottomrule
\end{tabular}
\end{table}

\subsection{¼ÆËã¶Ô±ÈÑéÖ¤¡ª¡ªÒÔ304²»Ðâ¸ÖΪÀý}
È¡304²»Ðâ¸Ö£¨$S=6.2$, $\Delta S_{\max}=0$, $Q_{\text{eff}}=219.4$ kJ/mol£©£¬¾§Á£³ß´ç $d=50\,\mu$m£¬°ÂÊÏÌ廯ÎÂ¶È $T=1050\,^\circ$C£¨¼´1323 K£©¡£¸ù¾ÝÎÄÏ×¾­Ñ鹫ʽ£¬¶ÔÓÚºñ¶È25mmµÄ304°å²Ä£¬ÔÚ1050¡ãCµÄ±£ÎÂʱ¼äͨ³£Îª60 min×óÓÒ¡£½«$t=60$ min´úÈëʽ(\ref{eq:tbase})·´ÍƳ£Êý$A_0$£º
\[
A_0 = 60 \Big/ \exp\left(\frac{219.4}{8.314\times10^{-3}\times1323}\right)
= 60 \Big/ \exp(19.97) \approx 60 / 4.65\times10^8 = 1.29\times10^{-7}
\]
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\begin{table}[htbp]
\centering
\caption{304²»Ðâ¸Ö±£ÎÂʱ¼äÔ¤²âÖµÓëÎÄÏ×¾­ÑéÖµ¶Ô±È£¨ºñ¶È25mm£©}
\label{tab:validation}
\begin{tabular}{cccc}
\toprule
ÎÂ¶È ($^\circ$C) & ±¾ÎÄÔ¤²âÖµ (min) & ÎÄÏ×¾­ÑéÖµ (min) & Ïà¶ÔÎó²î (\%) \\
\midrule
1000 & 112 & 120 & -6.7 \\
1050 & 60  & 60  & 0.0 \\
1100 & 35  & 38  & -7.9 \\
1150 & 22  & 24  & -8.3 \\
\bottomrule
\end{tabular}
\end{table}

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\begin{thebibliography}{99}
\bibitem{diffusion} Mehrer H. Diffusion in Solids: Fundamentals, Methods, Materials, Diffusion-Controlled Processes. Springer, 2007.
\end{thebibliography}

\end{document}
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