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1 - V_{\text{pore}}(1 + \eta \phi_{\text{void}}) > V_{\text{cont}}.
\end{equation}
ÕûÀíµÃ£º
\begin{equation}
1 - V_{\text{cont}} > V_{\text{pore}} (1 + \eta \phi_{\text{void}}).
\end{equation}
Òò´Ë£º
\begin{equation}
V_{\text{pore}} < \frac{1 - V_{\text{cont}}}{1 + \eta \phi_{\text{void}}}.
\label{eq:critical}
\end{equation}

È¡±£ÊØÖµ \(V_{\text{cont}} = 0.20\)£¬Ôò£º
\begin{equation}
\boxed{V_{\text{pore}} < \frac{0.8}{1 + \eta \phi_{\text{void}}}}.
\label{eq:final}
\end{equation}

\section{²»Í¬¿ÅÁ£ÐÎ״ϵÄÊýÖµ½á¹û}
\subsection{ÇòÐÎÔì¿×¼Á}
\(\phi_{\text{void}} \approx 0.38\)£¨Ëæ»ú¶Ñ»ý£©£¬\(\eta \approx 0.9\)£º
\[
V_{\text{pore}} < \frac{0.8}{1 + 0.9 \times 0.38} = \frac{0.8}{1.342} \approx 0.596.
\]
ͬʱÐèÂú×ã \(V_{\text{alloy}} = 1 - V_{\text{pore}} > V_c = 0.35\)£¬¼´ \(V_{\text{pore}} < 0.65\)£¬Á½Õß×ÛºÏÈ¡ \(V_{\text{pore}} \leq 0.55\) Ϊ°²È«ÉÏÏÞ¡£

\subsection{²»¹æÔòÔì¿×¼Á£¨ÈçÁ¢·½Ì壩}
\(\phi_{\text{void}} \approx 0.45\)£¬\(\eta \approx 0.7\)£º
\[
V_{\text{pore}} < \frac{0.8}{1 + 0.7 \times 0.45} = \frac{0.8}{1.315} \approx 0.608.
\]
µ«´ËÊ±ÉøÁ÷ãÐÖµÒò²»¹æÔò¿ÅÁ£Ò×ÐγÉÍøÂç¶ø½µµÍ£¬Êµ¼ÊÈ¡ \(V_{\text{pore}} \leq 0.35\) ¸üΪ¿É¿¿¡£

\section{Á£¾¶±ÈÃô¸ÐÐÔÌÖÂÛ}
Furnas Ä£ÐͳÉÁ¢µÄǰÌáÊÇÁ£¾¶±È \(R = d_{\text{pore}} / d_{\text{alloy}} \gtrsim 7\)--\(10\)¡£Èôʵ¼Ê¹¤ÒÕÖÐÁ£¾¶±ÈСÓÚ´ËÁÙ½çÖµ£¬Ð¡¿ÅÁ£ÎÞ·¨ÍêÈ«½øÈë¼ä϶£¬»áµ¼ÖÂÌî³äЧÂÊ \(\eta\) ÏÔÖøÏ½µ£¬ÉõÖÁÆÆ»µ´ó¿ÅÁ£¹Ç¼Ü¡£´Ëʱʽ \eqref{eq:final} »á¸ß¹À \(V_{\text{pore}}\) µÄÉÏÏÞ¡£Òò´Ë£¬ÔÚÓ¦Óøò»µÈʽʱ£¬±ØÐëÊ×ÏÈÑéÖ¤Á£¾¶±ÈÊÇ·ñÂú×ãÌõ¼þ¡£Èô \(R < 7\)£¬½¨Òéͨ¹ýÒýÈëϸ·Û»ò¸Ä±ä¿ÅÁ£ÐÎ×´À´Ìá¸ß \(\eta\)£¬·ñÔòÐè´ó·ù½µµÍ \(V_{\text{pore}}\) ÒÔ±£Ö¤³ÉÐÍÐÔ¡£

\section{½áÂÛ}
±¾ÎÄ´Ó Furnas ¶Ñ»ýÄ£Ðͳö·¢£¬½áºÏÉøÁ÷ÀíÂÛ£¬ÍƵ¼³öË«Á£¾¶»ìºÏÌåϵÖб£Ö¤»ùÌå·ÛÄ©Á¬ÐøÍøÂçµÄÁٽ粻µÈʽ£º
\[
V_{\text{pore}} < \frac{0.8}{1 + \eta \phi_{\text{void}}}.
\]
¸Ã²»µÈʽΪ¶à¿×²ÄÁϵÄÅä·½Éè¼ÆÌṩÁ˶¨Á¿±ß½ç£¬½ÒʾÁË£º
\begin{itemize}
    \item Ôì¿×¼ÁÌå»ý·ÖÊý´æÔÚÃ÷È·µÄÉÏÏÞ£¨Í¨³£²»³¬¹ý 55\%--60\%£©£»
    \item Ìá¸ßÌî³äЧÂÊ \(\eta\)£¨Èçϸ»¯Ôì¿×¼Á¡¢ÓÅ»¯¼¶Å䣩¿ÉÒÔÔÊÐí¸ü¸ßµÄ¿×϶ÂÊ£»
    \item µ±Ôì¿×¼ÁÁ£¾¶¹ý´óµ¼Ö \(\eta\) ½µµÍʱ£¬±ØÐë´ó·ù½µµÍÔì¿×¼Áº¬Á¿ÒÔ·ÀÌ®Ëú¡£
\end{itemize}

\begin{thebibliography}{99}
\bibitem{furnas1931} Furnas C C. Grading Aggregates I ¨C Mathematical Relations for Beds of Broken Solids of Maximum Density. Industrial \& Engineering Chemistry, 1931, 23(9): 1052¨C1058.
\bibitem{german2014} German R M. Powder Metallurgy and Particulate Materials Processing. Metal Powder Industries Federation, 2014.
\bibitem{sahimi1994} Sahimi M. Applications of Percolation Theory. Taylor \& Francis, 1994.
\end{thebibliography}

\end{document}
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