Error in Ajax request

I need to send the value of a table that is in a modal to the server and then open another modal using the information from the first table, however the variable always returns me null, I already tried to use ajax however it did not work, it does nothing and gives me no feedback, follow the code to better understand the problem:

MODAL THAT PASSES THE INFORMATION:

<form id="visualizarAparelhos" name="visualizarAparelhos" method="post" enctype="multipart/form-data">
    <table class="table table">
      <thead> 
        <tr>
        <th>Número</th>
        <th>Nome</th>
        <tbody>
          <?php
            $con = mysqli_connect("localhost","roberto","","manutencao");
            $query = ("select max(id) from aparelhos");
            $max = mysqli_query($con,$query);
            $fetch = mysqli_fetch_row($max);
            $max = $fetch[0];
            $i = 0;
              while ($i != $max)
              {
                $i++;
                $con = mysqli_connect("localhost","roberto","","manutencao");
                $query = ("select id,nome from aparelhos where id = ".$i." ");
                $aparelho = mysqli_query($con,$query);
                $fetch = mysqli_fetch_row($aparelho);
                $id = $fetch[0];
                $nome = $fetch[1];
                print "<tr>";
                // PRECISO PASSAR O IdAparelho para o segundo modal
                  print "<td id='IdAparelho' value='".$id."'><button type='button' class='btn btn-primary' data-toggle='modal' data-target='#modalVisualizarComponentes'>".$id."</button></td>"; 
                  print "<td><strong>".$nome."</strong></td>";
                print "</tr>";
              }
          ?>
        </tbody>   
        </tr>
      </thead>   
    </table>
    </form> 

MODAL RECEIVING INFORMATION:

<div class="modal-body">
    <table class="table table-striped">
        <tr>
        <th>Sequencial</th>
        <th>Código</th>
        <th>Nome</th>
        <th>Entrada</th>
        <th>Saída</th>
        <th>Quantidade F</th>
        <th>Quantidade M</th>
        <th>Quantidade G</th>
        <th>Quantidade GG</th>
        <th>Total</th>
        <tbody>
          <?php
            $con = mysqli_connect("localhost","roberto","","manutencao");
            // VOU USAR A INFORMAÇÃO DO OUTRO MODAL AQUI
            $query = ("select id_principal from componentes where id_secundario = ".$_POST['IdAparelho']." ");
            $ids = mysqli_query($con,$query);
            while ($linha = mysqli_fetch_array($ids))
            {
                $con = mysqli_connect("localhost","roberto","","manutencao");
                $query = ("select * from componentes where id_principal = ".$linha[0]." ");
                $componentes = mysqli_query($con,$query);
                $resultado = mysqli_fetch_row($componentes);

                $id_componente = $resultado[1];
                $codigo = $resultado[2];
                $nome = $resultado[3];
                $entrada = $resultado[4];
                $saida = $resultado[5];
                $f = $resultado[6];
                $m = $resultado[7];
                $g = $resultado[8];
                $gg = $resultado[9];
                $total = ($f + $m + $g + $gg);

                print "<tr>";
                  print "<td><strong>".$id_componente."</strong></td>";
                  print "<td><strong>".$codigo."</strong></td>";
                  print "<td><strong>".$nome."</strong></td>";
                  print "<td><strong>".$entrada."</strong></td>";
                  print "<td><strong>".$saida."</strong></td>";
                  print "<td><strong>".$f."</strong></td>";
                  print "<td><strong>".$m."</strong></td>";
                  print "<td><strong>".$g."</strong></td>";
                  print "<td><strong>".$gg."</strong></td>";
                  print "<td><strong>".$total."</strong></td>";
                print "</tr>";
              }
          ?>
        </tbody>   
        </tr>
      </thead>   
    </table>    
  </div>

MY AJAX:

 $(function () {    
        $("#visualizarAparelhos").submit(function (e) {
        e.preventDefault();
        var FormData = $($this).serialize(); 
            $.ajax({
              type: "POST", 
              url: "administrador.php",
              data: FormData
            }).done(function (data) {
                alert(data);
            });
        return false;
        alert("Não funfou!!!");
        }); 
    });